BRX User Manual, 2nd Edition Chapter 8 Ch8

User Manual: Chapter 8 BRX Do-more Platform User Manual and Inserts

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BRX Analog I/O
Expansion Modules

Chapter

In This Chapter...
Overview..................................................................................................................... 8-2
Module Types............................................................................................................. 8-2
Wiring Termination Options...................................................................................... 8-4
Terminal Block Connectors..................................................................................... 8-4
ZIPLink Wiring System............................................................................................ 8-5
General Specifications................................................................................................ 8-6
Dimensional Information........................................................................................... 8-6
Module Installation.................................................................................................... 8-7
Module Configuration................................................................................................ 8-8
Analog Tips and Troubleshooting.............................................................................. 8-9
General Tips for Analog Circuits............................................................................. 8-9
Reducing Electrical Noise...................................................................................... 8-10
Current Module Tips and Troubleshooting.......................................................... 8-12
Voltage Module Tips and Troubleshooting.......................................................... 8-14
Temperature (Thermocouple) Module Tips and Troubleshooting..................... 8-15
BX-08AD-1 Analog Current Sinking Input............................................................... 8-16
BX-08AD-2B Analog Voltage Input.......................................................................... 8-21
BX-04THM Thermocouple Input.............................................................................. 8-26
BX-08DA-1 Analog Current Source Output............................................................. 8-32
BX-08DA-2B Analog Voltage Output....................................................................... 8-37

Chapter 8: BRX Analog I/O Expansion Modules

1 Overview
One of the unique features of the BRX platform is its ability to easily expand its capability to fit
your application solution. One of the ways the BRX platform can do this is by using expansion
2
modules that conveniently “snap-on” to the side of any BRX MPU.
The analog expansion modules give you the ability to add additional analog I/O as needed and
3
are identified as an input module, output module or temperature input module. On the front
panel of the analog I/O expansion modules a color scheme and a symbol are used to denote the
4
module type. Analog modules are available in 8-point current inputs/outputs, 8-point unipolar
or bipolar voltage inputs/outputs, and 4-point thermocouple input modules.
5
6 Module Types
Analog Input Modules
7
Two (2) analog input modules are available, with current or voltage inputs.
Analog input module faceplates have a blue terminal bar to distinguish them as
8
inputs, with symbols
or to signify current or voltage, respectively. Listed
in the table below are the different types of input modules available.
9
10
Analog Input Modules
11
Identifier
Input Type
8-Point
12
AD-1
13
AD-2B
14
15
A
B
C
D
I0+
I1+
I2+
I3+

Blue Label
for Input

I4+
I5+
I6+
I7+

BX-08AD-1

8-2

BRX User Manual, 2nd Edition

Current Sink
0–20mA, 4–20mA

BX-08AD-1

Voltage
±10VDC, ±5VDC,
0–5VDC, 0–10VDC

BX-08AD-2B

Chapter 8: BRX Analog I/O Expansion Modules

Temperature Input Module
INPUT
TC0+
TC0TC1+
TC1TC2+
TC2TC3+
TC3-

A temperature input module is available with thermocouple inputs. The
temperature input module can also be configured for millivolt-level voltage
inputs. Temperature module faceplates have a blue terminal bar and symbol
for easy distinction from other module types. The table below shows the
temperature input module and its input type.
Blue Label
for Input

Temperature Input Module

Identifier
THM

Type

4-Point

Thermocouple

BX-04THM

Analog Output Modules

W
Y

I0+
I1+
I2+
I3+
I4+
I5+
I6+
I7+

Two (2) analog output modules are available, in current and voltage outputs.
Analog output module faceplates have a red terminal bar to distinguish them as
outputs, with symbols
or to signify current or voltage, respectively. Listed
in the table below are the different types of output modules available.
Red Label
for Output

Analog Output Modules

Identifier

Type

8-Point

DA-1

Current Source
0–20mA, 4–20mA

BX-08DA-1

DA-2B

Voltage
±10VDC, ±5VDC,
0–5VDC, 0–10VDC

BX-08DA-2B

BX-08DA-1

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Chapter 8: BRX Analog I/O Expansion Modules

1 Wiring Termination Options
The BRX analog expansion modules ship without wiring terminals blocks. This allows you
to select the termination style that best fits your application. There are several wiring options
2
available, including removable screw terminal connectors, removable spring clamp terminal
connectors and pre-wired ZIPLink cable solutions. The BRX Temperature Input Modules
3
include the BX-RTB10 kit. The BX-RTB10-1 or BX-RTB10-2 can also be used and can be
purchased separately.
4
Terminal Block Connectors
The terminal block connectors are provided in kits of multiple connectors that are easily ordered
5
as a single part number. The kits for the 8-point modules and for the 4-point thermocouple
module include (2) 10-pin 3.81-mm connectors.
6
Terminal block kit part numbers and connector specifications are listed in the following table.
7
Terminal Block Specifications
Part Number
BX-RTB10
BX-RTB10-1
BX-RTB10-2
8
9
10
11
12
13
14
15
A
NOTE: BX-RTB10 terminal blocks are included with Temperature Input modules.
B
C
D
BX-RTB10 Kit

BX-RTB10-1 Kit

Connector Type

Screw Type
90 degree

Spring Clamp Type
180 degree

Screw Type
180 degree

Wire Exit

180 degree

Pitch

3.81 mm

Screw Size

N/A

Screw Torque
Recommended

<1.77 lb·in
(0.2 N·m)

N/A

<1.77 lb·in
(0.2 N·m)

Screwdriver
Blade Width

2.5 mm

Wire Gauge
(Single Wire)

28–16 AWG

26–18 AWG

30–16 AWG

Wire Gauge
(Dual Wire)

28–18 AWG

30–20 AWG
(Dual Wire Ferrule
Required)

30–18 AWG

Wire Strip Length

0.24 in (6mm)

0.35 in (9mm)

0.26 in (6.5 mm)

Equiv. Dinkle P/N

EC381V-10P-BK

ESC381V-10-BK

EC381F-10P-BK

BX-RTB10-2 Kit

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Chapter 8: BRX Analog I/O Expansion Modules

ZIPLink Wiring System
BRX analog expansion modules can be quickly connected to convenient ZIPLink remote
terminal blocks for ease of wiring remote I/O devices. The following table lists the connector
options. The ZIPLink wiring system is not available for use with the BRX Temperature Input
Module.

8-Point BRX Analog Expansion Module ZIPLink Selector
Expansion Module
Part No.

ZIPLink
Module

ZIPLink Module
Part No.

Qty
Needed

ZIPLink Cable
Part No.*

Qty
Needed

Feedthrough

ZL-RTB20
(standard)
OR
ZL-RTB20-1
(compact)

ZL-BXEM-CBL20
ZL-BXEM-CBL20-1
ZL-BXEM-CBL20-2

BX-08AD-1
BX-08AD-2B
BX-08DA-1
BX-08DA-2B

*S
elect the cable length: Blank = 0.5 m, -1 = 1.0 m, -2 = 2.0 m.
Available pigtail cables: ZL-BXEM-CBL20-1P = 1.0 m, ZL-BXEM-CBL20-2P = 2.0 m.

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Chapter 8: BRX Analog I/O Expansion Modules

1 General Specifications
All BRX analog expansion modules and temperature input modules have the same general
specifications listed in the table below.
2
General Specifications
3
4
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8
9
10
11
12 Dimensional Information
13
14
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A
B
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Operating Temperature

0° to 45°C (32° to 113°F)

Storage Temperature

−20° to 70°C (−4° to 158°F)

Humidity

5 to 95% (non-condensing)

Environmental Air

No corrosive gases permitted

Vibration

IEC60068-2-6 (Test Fc)

Shock

IEC60068-2-27 (Test Ea)

Enclosure Type

Open Equipment

Agency Approvals

UL 61010-2-201 File # E139594 Canada and USA
CE (Safety: EN61010-2-201 and Immunity: EN61131-2: 2007)

Noise Immunity

NEMA ICS3-304

EU Directive

See the “EU Directive” topic in the BRX Help File.

3.25″
[82.6mm]

1.08″
[27.5mm]

4.57″
[116.2mm]

4.24″
[107.8mm]

1.00″
[25.4mm]

2X Ø #8 Thru all

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Chapter 8: BRX Analog I/O Expansion Modules

Module Installation
WARNING: Do not apply field power until the following steps are completed. The BRX expansion
modules are NOT hot swappable.

To install an expansion module, remove the connector cover on the right side of the MPU or
expansion module to which the new module is to be connected. Align the expansion connectors
and insert the module until you hear a “click”, indicating the module expansion connectors
have engaged.

To remove, depress
disengagement plungers
at top and bottom
of module

To Install, remove
Connector Cover

PWR
RUN

RUN
TER

ERR

M
STOP

TX
RX

LNK
ACT

2
Align
expansion
connectors, insert,
and listen for “Click”
as the lock engages

To remove an expansion module locate the two disengagement plungers. One is located at the
top of the of the expansion module and a second one at the bottom of the expansion module.
Depressing both plungers at the same time will release the locking mechanism and disengage
the unit from the system.
NOTE: Allow a minimum of 45mm (1.75in) to the right of MPU chassis and any subsequent expansion
modules for mounting and dismounting of the modules.

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Chapter 8: BRX Analog I/O Expansion Modules

1 Module Configuration
Once the expansion module has snapped in place and is added to the project it instantly adds
additional I/O and features to the MPU with minimal additional setup required.
2
To configure a newly attached module, load the Do-more! Designer software and connect to
the BRX MPU, as discussed in Chapter 10. A graphical representation of the BRX unit with
3
its attached modules is displayed in the Dashboard of the software.
4
5
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8
9
10
11
12
To access the module configuration dialogs, left-click or right-click on the module in the
Dashboard and select (1) Configure Module. The configuration dialogs for each module are
13
discussed in the corresponding section of this chapter.
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Chapter 8: BRX Analog I/O Expansion Modules

Analog Tips and Troubleshooting
This subsection presents common tips on selection and installation of analog hardware, as well
as basic troubleshooting techniques, to maximize the performance of your analog input/output
circuits.

General Tips for Analog Circuits
When selecting and installing analog devices there are a few things to consider:
• Current devices are much more tolerant to noise than voltage devices.
• Current devices can handle much longer runs of wire without signal loss.
• Shielded twisted pair wire should always be used. Analog signals are typically low
power and the better your isolation the less noise you will have degrading the signal.
• If the analog signal is from a thermocouple, the appropriate thermocouple extension
wire and terminal blocks must be used if needed to extend wire lengths.
• Use the shortest wiring route whenever possible.
• Do not run analog signal wiring in the same conduit or wire way as AC wiring.
• Do not run analog signal wiring next to large
motors, high current switches, or transformers.
120–240 VAC
24VDC
- +
• Route the wiring through an approved cable
housing to minimize the risk of accidental damage.
L
N G V- V+
• Shields should be connected only at one end, to
AC
ground at the source device. Connecting both
Power
ends of a shield will create a ground loop which
can increase the noise in a circuit.
• Bonding of the DC negative to ground should be
considered, with the exception of Class II power
supplies which should never be bonded to ground.
This can help with reducing noise induced into
analog circuits. Please note that consideration
should be given to all devices that will utilize
the power supply to insure that bonding of the
negative will not cause damage or interference.
• AC power should be checked from neutral
to ground. This voltage should be less than
0.1 VAC.
AC Power In

Auxillary out

300mA max.

NOTE: Your company may have guidelines for wiring and cable installation. If so, you should check those
before you begin the installation.
NOTE: Check local and national codes to choose the correct method for your application.

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Reducing Electrical Noise
Electrical noise is one of the most difficult problems to diagnose. It can enter the system from
a wide range of conducted or radiated sources.
Conducted noise is when the electrical interference is introduced into the system by way of
an attached wire, panel connection, etc. It may enter through an I/O point, a power supply
connection, the communication ground connection, or the chassis ground connection.
Radiated noise is when electrical interference is introduced into the system without a direct
electrical connection, such as via radio waves.
It may be difficult to determine how electrical noise is entering the system, but the corrective
actions for either type of noise problem are similar.
While electrical noise cannot be eliminated completely, it can be reduced to a level that will not
affect system function. Proper grounding of components and signal wiring along with proper
isolation of voltages can minimize noise in the system.

Grounding
Most noise problems result from improper grounding of the system. A good earth ground can
be the single most effective way to correct noise problems. If a ground is not available, install
a ground rod as close to the system as possible.
Ensure all ground wires are single point grounds and are not daisy chained from one device to
another. Ground metal enclosures around the system. Loose ground wires on your devices are
more susceptible to noise than the other wires in your system. A loose wire is no more than
a large antenna waiting to introduce noise into the system; therefore, you should tighten all
connections in your system. Review Chapter 1, “General Installation and Wiring Guidelines”,
if you have questions regarding how to ground your system.

Proper Ground Connection
PLC
GND

8-10

Other
Equipment

Power
Supply

GND

BRX User Manual, 2nd Edition

GND

Improper Ground Connection
PLC
GND

Other
Equipment
GND

Power
Supply
GND

Chapter 8: BRX Analog I/O Expansion Modules
Cables with shields should be grounded on only one end of the shield. This prevents ground
loops and allows for any radiated noise collected by the shield to properly drain to a single
ground point.

Shielded Twisted-pair cable

Poten�al
Diﬀerence

Isolation
Electrical noise can enter the system through the power source for the MPU and I/O. Installing
an isolation transformer for all AC sources can correct this problem.
DC power sources should be properly grounded, except for Class II power supplies which
should never be bonded to ground. Switching DC power supplies commonly generate more
noise than linear supplies. Typically switching type supplies work well for analog circuits, but
for some circuits where noise can be a factor, linear type supplies may be needed.
Analog wiring should be placed in separate wire ways or wiring bundles. Keep AC and DC
wiring separated. Never run analog signal or communications wiring in parallel or in close
proximity to high voltage wiring.
Transformers, inductors, VFDs, DC drives, welders, static generators, ultrasonic devices, radio
transmitters, receivers, wiring and antennas, along with similar types of devices, generate large
amounts of RF interference. DC wiring, analog wiring and communications wiring should
be kept as far away from these sorts of devices and their associated input and output wiring as
possible.
Devices that generate noise such as those listed above, along with coil driven devices such as
relays, contactors, solenoids, etc., should be placed on a separate power supply from analog
circuits. If this is not possible, then great care should be taken to properly suppress the transient
voltage spikes from these devices turning on and off. See Chapter 1, “BRX General Installation
and Wiring Guidelines” for more information on this subject.

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Current Module Tips and Troubleshooting
•

Use shielded twisted pair wire. Suggested ADC cables are PLTC3-18-xS-xxxx or
PLTC3-18-xSS-xxxx

•

Analog circuits follow Ohm’s Law. As such it is important to follow the specifications
for impedance in the circuit. If you allow the impedance values to go outside of the
specification, damage to the module will occur.

•

If your transmitter requires a load resistance higher than 125Ω, you may need to add a
resistor in series with the module. Consider the following example for a transmitter
being operated from a 24VDC supply with a recommended load resistance of 750
ohms. Since the module has a 125-ohm resistance, you need to add an additional
resistor.
R = Tr – Mr
R = 750 – 125
R ≥ 625

R = Resistor to add
Tr = Termination Requirement
Mr = Module resistance
(Internal 125 ohms)
Module Channel 1

R
CH1

+
Two-wire

Transmitter

DC Supply
+24V

COM
125 ohms

0V
0V

•

8-12

If you suspect an I/O error, there are several things that could be causing the problem:
• A blown fuse.
• A loose terminal block.
• The 24VDC supply has failed or 24VDC has not been supplied to the I/O
common.
• The I/O point has failed.
The DC power supply that powers the module should be checked for the negative side
to ground voltage being under 0.1 V for both AC and DC. If this voltage is floating,
it can cause errors and/or damage to the circuit.

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules
•

To test a current input module, use a
1.5 V battery wired across the positive
and negative terminals of the channel to
check for current. When applied across
a current analog input point, a reading
of approximately 30% of the full scale
value should result.

0–20mA is 0–5VDC across the
input resistor
1.5V/5V=0.3
0.3*65535 = ~19660 counts or
0.3*32767=~9830 counts

Module
CH1

1.5V
+

•

COM

Most current input modules read
voltage across a shunt resistor. It may
be easier to test for proper current
by measuring the voltage across that
shunt resistor and applying Ohm’s Law
(Voltage/125Ω = Current).

Module Channel 1

CH1

+
Two-wire

Transmitter

DC Supply
+24V

COM
125 ohms

0V
0V

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Voltage Module Tips and Troubleshooting
•
•

Use shielded twisted pair wire. Suggested ADC cables are PLTC3-18-xS-xxxx or PLTC318-xSS-xxxx.
Jumper the positive and negative terminals together on unused voltage input channels.

•

If you suspect an I/O error, there are several things that could be causing the problem:
• A blown fuse
• A loose terminal block
• The 24VDC supply has failed or 24VDC has not been supplied to the I/O common.
• The I/O point has failed.

•

The DC power supply that powers the module should be checked for the negative side to
ground voltage being under 0.1 V for both AC and DC. If this voltage is floating, it can
cause errors and/or damage to the circuit.

•

To test the voltage input module, use a 1.5 V battery wired across the positive and negative
terminals of the input channel to check for voltage. When applied across a voltage analog
input point, a reading of approximately 1.5 V should result.

Module
1.5V
+

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CH1
COM

Chapter 8: BRX Analog I/O Expansion Modules

Temperature (Thermocouple) Module Tips and Troubleshooting
•
•
•
•

•

•
•

•

Use shielded thermocouple extension wire of the same type as the thermocouple.
Do not use terminal blocks that are not designed for thermocouple extension wire.
Thermocouple wires that have just been twisted to form a junction will inherently
be less accurate than factory made thermocouples. The use of twist junction
thermocouples is not recommended.
Jumper each of the channel +/- connections together on the module with a short piece
of copper wire. This will cause the module to return the measured terminal block
temperature for that channel. Does it read the correct ambient temperature of the
thermocouple module? If so there probably isn’t anything wrong with the module.
This temperature will be several degrees higher than the ambient air temperature of
the enclosure.
With a thermocouple simulator, you have to disable the burnout detection for the
module using the module setup in the Do-more! Designer software and download
the program to the PLC. This will disable the burnout circuitry, which will cause
incorrect readings if left enabled. Even then, it is likely that the module will not read
exactly what the simulator is putting out due to the wire differences and the terminal
block on the module causing some cold junction error.
It is possible that the module may be damaged from exceeding the common mode
voltage spec which is 5 Volts. The voltage needs to be measured between each channel
on both plus and minus terminals of the module on both AC and DC scales and make
sure that it is under 5 Volts maximum. Preferably the voltage should be less than
0.1V.
AC power should be checked from neutral to ground. This voltage should be less than
0.1 VAC.
With grounded thermocouples, take precautions to prevent having a voltage potential
between thermocouple tips. A voltage of 1V or greater between tips will skew
measurements. For grounded thermocouples, the equipment and thermocouples must
be bonded with large-gauge braided wire to the same ground as the PLC.
The DC power supply that powers the module should be checked for the negative side
to ground voltage being under 0.1V for both AC and DC. If this voltage is floating, it
can cause errors and/or damage to the circuit.

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1 BX-08AD-1 Analog Current Sinking Input
2
Analog Current Sinking Input Specifications
3
4
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A
B IMPORTANT!
C
D
C

UL
R

I0+
I1+
I2+
I3+
I4+
I5+
I6+
I7+

BX-08AD-1

Terminal Blocks
Sold Separately

We recommend using prewired ZIPLink
cables and connection modules.
If you wish to hand-wire your module,
a removable terminal block is available.
See Wiring Termination Selection in this
chapter for all options.

Inputs per Module

Commons

Module Signal Input Range

0–20mA, 4–20mA (Default)

Signal Resolution

16-bit, 15-bit (Default)

Input Impedance

125Ω±0.1%, 1/10th watt

All Channel Update Rate

45ms (8 channels)

Over Current Circuit Detection Time

< 1second

Maximum Continuous Overload
(Voltage)

0.5 Watts (e.g. ±100V @ 5mA)

Sample Duration Time

5μs per channel

Hardware Filter Characteristics

Low Pass 1st order, −3dB @ 144Hz

Conversion Method

Successive approximation

Linearity Error (end to end)

±0.01% of range

Input Stability and Repeatability

±0.035% of range (after 10 min. warmup)

Full Scale Calibration Error

±0.02% of range

Offset Calibration Error

±0.02% of range

Accuracy vs. Temperature

±25PPM / ºC maximum

Maximum Inaccuracy

0.1% of range (incl. Temperature Drift)

Maximum Crosstalk

−96dB, 1 LSB

Channel to Backplane Isolation

1800VAC applied for one second

Channel to Channel Isolation

None

Loop Fusing (External)

Fast-acting 0.032A recommended

Backplane Power Consumption

0.1 W

External DC Power Required

Class 2 or LPS power supply
24VDC (±20%)
25mA

Heat Dissipation

2.5 W

Weight

100g (3.5 oz)

Software Version

Do-more! Designer Programming
Software version 2.1 or later

Hot-Swapping Information

NOTE: This device cannot be Hot Swapped.

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BX-08AD-1 Analog Current Sinking Input, continued
Data Range Specifications
Selection

Enable 16 bit Unchecked
(15 bit Resolution, Default)
µA Per
Raw Counts
Casting*
Count

Description

Enable 16 bit Checked
(16 bit Resolution)
Raw Counts

Casting*

µA Per
Count

0–20mA

unipolar 0–20mA

0–32767

–

0.61

0–65535

WXn:U

0.31

4–20mA

unipolar 4–20mA

0–32767

–

0.49

0–65535

WXn:U

0.24

* For more information on Casting refer to Help topic DMD0309 in the Do-more! Designer Software.

The module reserves the first 24 bits of unused contiguous space in the X register, aligned to
an 8-bit word boundary, for status reporting. Error flags for this module are laid out within its
status register space as described in the following table.

Error Flag Specifications
MSB

LSB

1st Byte of unused X Registers
-

Data Not
Valid

Missing
24VDC

Self Test
Failed

Channel 8

Channel 7

Channel 6

Channel 5

Channel 4

Channel 3

Channel 2

Channel 1

Module Status
2nd Byte of unused X Registers

Channel Open
(Broken Transmitter)*

3rd Byte of unused X Registers

Unused

* Broken Transmitter bits will turn on below ~3.75 mA.

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9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-08AD-1 Analog Current Sinking Input, continued
Analog Current Input Wiring
2
3
INTERNAL
MODULE CIRCUITRY
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D

Analog Current Sinking Input Circuits
*An Edison S500-32-R 0.032 A fast-acting fuse is recommended
for all analog voltage inputs, analog outputs, and current loops.

–

CH1 ADC

125Ω

CH2 ADC

125Ω

CH3 ADC

125Ω

CH4 ADC

125Ω

CH5 ADC

125Ω

CH6 ADC

125Ω

CH7 ADC

COM
COM
COM
COM
COM
COM
COM
COM
0V
24V+

24VDC
Class 2 or LPS
User Supplied
Power

8-18

125Ω

*Fuse

0.032 A

2-Wire 4-20 mA
Transmitter

2-Wire Transmitter

0.032 A

3-Wire Current +
Transmitter

–

3-Wire Transmitter

–
+
AC or DC

–

Power
Supply

*Fuse

4-Wire 4-20 mA
Transmitter

Ix+

1C/COM

1C
I4+
I5+
I6+
I7+

125Ω

CH0 ADC

1C
I0+
I1+
I2+
I3+

Ix+
1C/COM

24VDC User
Supplied Power

*Fuse

0.032 A

Ix+

1C/COM

User Supplied Transmitter Power

4-Wire Transmitter

ISOLATED ANALOG
CIRCUIT POWER

ISOLATED ANALOG
CIRCUIT COMMON

BRX User Manual, 2nd Edition

NOTE: Shield should be connected only at one end, to ground at the
source device.

Chapter 8: BRX Analog I/O Expansion Modules

BX-08AD-1 Analog Current Sinking Input, continued
Software Setup
After the module is installed, open the Do-more! Designer programming software version 2.1
or later, connect to the BRX MPU and open the Configure Module dialog as described at the
beginning of this chapter.

(1) The module options are divided into subsets across multiple tabs. Click the appropriate tab to
edit the configuration.
(2) Module Configuration
Name – Each module comes with a default name. This may be changed by the user to better
identify the module if desired.
Info – This is the system description of the module. It is static and may not be changed.
(3) Global Settings
Channels Enabled – Select how many channels will be used. The default is all channels.
Selecting fewer channels may increase the update frequency. See the module specifications for
details.
(4) Global Status Bits
Self Test Failed – This bit will be On if the module has failed its internal self-test. In this case
the module is likely bad and should be replaced.
Missing 24V – This bit will be On if the external 24VDC power is missing. Check the 24VDC
power connection on the module terminal block.
Data Not Valid – This bit will be On if the module does not have the latest configuration
parameters or the module has not been configured at all. Reload the program into the CPU
and power cycle.

BRX User Manual, 2nd Edition

8-19

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-08AD-1 Analog Current Sinking Input, continued
2
3
4
5
6
(5) Analog Input x
These settings are for each channel of the analog module.
7
Drop Down menu - Select the range of the analog input here.
Enable 16 bit unipolar data – Check this box to change the raw count range from a signed
8
decimal bipolar data format to an unsigned decimal data format. This may require that Casting
be used in the program in order to properly access the data. Refer to the chart of Data Range
9
Specifications earlier in this chapter to see if the registers must be accessed with Casting.
(6) WXx
10
Range – The number of Raw counts for the selected channel on the module
Units/Ct – The amount of current that will equal 1 raw count.
11
Broken Transmitter – The input register that when On will indicate that the loop is broken.
(7) RXx
12
Range – The engineering units to which the raw counts are scaled.
Units/Ct – The number of raw counts that will equal 1 scaled engineering unit.
13
(8) Enable Scaling from WXx to RXx
WXx Min – The minimum value of the raw counts to scale.
14
WXx Max – The maximum value of the raw counts to scale.
15
RXx Min – The minimum value of the engineering units for scaling.
RXx Max – The maximum value of the engineering units for scaling.
A
Counts/mA – Use these buttons to change the raw scaling to counts or milliamps.
Clamp RXx – If this box is checked, RXx will clamp at the minimum and maximum scaled
B
values.
C
D
8-20

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules

BX-08AD-2B Analog Voltage Input
C

UL
R

V0+
V1+
V2+
V3+
V4+
V5+
V6+
V7+

BX-08AD-2B

Terminal Blocks
Sold Separately

Analog Voltage Input Specifications
Inputs per Module

Commons

Module Signal Input Range

±10 VDC, ±5 VDC,
0–5 VDC, 0–10 VDC (default)

Signal Resolution

16-bit, 15 bit (Default)

Input Impedance

>10MΩ

All Channel Update Rate

45ms (8 channels)

Sample Duration Time

5µs per channel

Hardware Filter Characteristics

Low Pass 2nd order, −3dB @ 15kHz

Conversion Method

Successive approximation

Accuracy vs. Temperature

±25PPM / °C maximum

Maximum Inaccuracy

0.15% of full range (over temp)

Linearity Error (end to end)

±0.03%

Input Stability and Repeatability

±0.06% of range (after 10 min. warmup)

Full Scale Calibration Error

±0.08% of range

Offset Calibration Error

±0.08% of range

Maximum Crosstalk

−96dB, 1 LSB

Channel to Backplane Isolation

1800VAC applied for one second

Channel to Channel Isolation

None

Loop Fusing (External)

Fast-acting 0.032A recommended

Backplane Power Consumption

0.1 W

External DC Power Required

Class 2 or LPS power supply
24VDC (±20%)
25mA

Heat Dissipation

2.5 W

Weight

100g (3.5 oz)

Software Version

Do-more! Designer Programming
Software version 2.1 or later

IMPORTANT!
Hot-Swapping Information
NOTE: This device cannot be Hot Swapped.

BRX User Manual, 2nd Edition

8-21

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-08AD-2B Analog Voltage Input, continued
Data Range Specifications
2
3
4
5
6
7
The module reserves the first 24 bits of unused contiguous space in the X register, aligned to
an 8-bit word boundary, for status reporting. Error flags for this module are laid out within its
8
status register space as described in the following table.
Error Flag Specifications
9
MSB
LSB
10
Module Status
11
12
Channel Out of
Range
13
Unused
14
15
A
B
C
D
Selection

Description

Enable 16 bit Unchecked
(15 bit Resolution, Default)1
µV Per
Raw Counts
Casting2
Count

Enable 16 bit Checked
(16 bit Resolution)

Raw Counts

Casting2

µV Per
Count

0–10V

unipolar 10VDC

0–32767

305

0–65535

WXn:U

152

0–5V

unipolar 5VDC

0–32767

152

0–65535

WXn:U

±10V

bipolar 10VDC

−32768 to 32767

305

±5V

bipolar 5VDC

−32768 to 32767

152

1. Bipolar ranges default to 16-bit resolution.

2. For more information on Casting refer to Help topic DMD0309 in the Do-more! Designer Software.

1st Byte of unused X Registers
-

Data Not
Valid

Missing
24VDC

Self Test
Failed

Channel 7

Channel 6

Channel 5

Channel 4

Channel 3

Channel 2

Channel 1

2nd Byte of unused X Registers

Channel 8

3rd Byte of unused X Registers
-

8-22

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules

BX-08AD-2B Analog Voltage Input, continued
Analog Voltage Input Wiring
Analog Voltage Input Circuits

INTERNAL
MODULE CIRCUITRY
1C
V0+
V1+
V2+
V3+
1C
V4+
V5+
V6+
V7+

*Fuse

CH0 ADC

4-Wire Voltage
Transmitter

CH1 ADC
CH2 ADC

CH3 ADC

Vx+

0.032 A

1C/COM

–

AC or DC

Optional Transmitter Power Supply

4-Wire Transmitter

CH4 ADC
CH5 ADC

*Fuse

CH6 ADC
CH7 ADC

COM
COM
COM
COM
COM
COM
COM
COM
0V
24V+

24VDC
Class 2 or LPS
User Supplied
Power

*An Edison S500-32-R 0.032 A fast-acting fuse is recommended
for all analog voltage inputs, analog outputs, and current loops.

3-Wire Voltage
Transmitter

0.032 A Vx+
WX

3-Wire Transmitter

1C/
COM

24VDC User
Supplied Power
V7+

NOTE: For maximum accuracy: Jumper
unused inputs to common.

V8+
COM

NOTE: Shield should be connected only at one end, to ground at the
source device.

ISOLATED ANALOG
CIRCUIT POWER
ISOLATED ANALOG
CIRCUIT COMMON

BRX User Manual, 2nd Edition

8-23

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-08AD-2B Analog Voltage Input, continued
Software Setup
2
After the module is installed, open the Do-more! Designer programming software version 2.1
or later, connect to the BRX MPU and open the Configure Module dialog as described at the
beginning of this chapter..
3
4
5
6
7
8
9
(1) The module options are divided into subsets across multiple tabs. Click the appropriate tab to
edit the configuration.
10
(2) Module Configuration
Name – Each module comes with a default name. This may be changed by the user to better
11
identify the module if desired.
Info – This is the system description of the module. This is static and may not be changed.
12
(3) Global Settings
Channels Enabled – Select how many channels will be used. The default is all channels.
13
Selecting fewer channels may increase the update frequency. See the module specifications for
details.
14
(4) Global Status Bits
Self Test Failed – This bit will be On if the module has failed its internal self-test. In this case
15
the module is likely bad and should be replaced.
Missing 24V – This bit will be On if the external 24VDC power is missing. Check the 24VDC
A
power connection on the module terminal block.
Data Not Valid – This bit will be On if the module does not have the latest configuration
B
parameters or the module has not been configured at all. Reload the program into the CPU
and power cycle.
C
D
8-24

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules

BX-08AD-2B Analog Voltage Input, continued

(5) Analog Input x
These settings are for each channel of the analog module.
Drop Down menu - Select the range of the analog input here.
Enable 16 bit unipolar data – Check this box to change the raw count range from a signed
decimal bipolar data format to an unsigned decimal data format. This may require that Casting
be used in the program in order to properly access the data. Refer to the chart of Data Range
Specifications earlier in this chapter to see if the registers must be accessed with Casting.
(6) WXx
Range – The number of Raw counts for the selected channel on the module
Units/Ct – The amount of voltage that will equal 1 raw count.
Out of Range – The input register that when On will indicate that the voltage is outside of the
selected range.
(7) RXx
Range – The engineering units to which the raw counts are scaled.
Units/Ct – The number of raw counts that will equal 1 scaled engineering unit.
(8) Enable Scaling from WXx to RXx
WXx Min – The minimum value of the raw counts to scale.
WXx Max – The maximum value of the raw counts to scale.
RXx Min – The minimum value of the engineering units for scaling.
RXx Max – The maximum value of the engineering units for scaling.
Counts/VDC – Use these buttons to change the raw scaling to counts or volts.
Clamp RXx – If this box is checked, RXx will clamp at the minimum and maximum scaled
values.

BRX User Manual, 2nd Edition

8-25

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-04THM Thermocouple Input
Thermocouple Input Specifications
2
3
4
5
6
7
8
9
10
11
12
13
14
15
NOTE: This device does not
support ZIPLink Wiring Systems
A
B IMPORTANT!
C
D
C

UL
R

INPUT

TC0+
TC0TC1+
TC1TC2+
TC2TC3+
TC3-

BX-04THM

BX-RTB10 Terminal
Blocks Included

Hot-Swapping Information

NOTE: This device cannot be
Hot Swapped.

8-26

Input Channels

4 Differential

Commons

Input Impedance

>5MΩ

Resolution

16-bit, 0.1°(C or F)

Thermocouple Input Ranges

Type J: −190° to 760°C (−310° to 1400°F)
(default)
Type E: −210° to 1000°C (−346° to 1832°F)
Type K: −150° to 1372°C (−238° to 2502°F)
Type R: 65° to 1768°C (149° to 3214°F)
Type S: 65° to 1768°C (149° to 3214°F)
Type T: −230° to 400°C (−382° to 752°F)
Type B: 529° to 1820°C (984° to 3308°F)
Type N: −70° to 1300°C (−94° to 2372°F)
Type C: 65° to 2320°C (149° to 4208°F)

Cold Junction Compensation

Automatic

Thermocouple Linearization

Automatic

Accuracy vs. Temperature

±50PPM per °C (maximum)

Linearity Error

±1°C maximum (±0.5°C typical)
Monotonic with no missing codes

Maximum Inaccuracy–
Temperature

±3°C maximum (excluding thermocouple
error) (including temperature drift)

Linear Voltage Input Ranges

0–39mV
±39mV
±78mV
0–156mV
±156mV
0–1.25 V

Maximum Inaccuracy–Voltage

0.06% @ 25°C, 0.10% @ 0–60°C

All Channel Update Rate

2.16 s

Sample Duration Time

270ms

Open Circuit Detection Time

Within 2s

Maximum Ratings

Fault protected inputs to ±50V

Common Mode Range

0.6 V (@ 16-bit Resolution)

Common Mode Rejection

100dB @ DC and 130dB @ 60Hz

Conversion Method

Sigma-Delta

Backplane Power Consumption

0.1 W

External DC Power Required

Class 2 or LPS power supply
24VDC (±20%)
25mA

Heat Dissipation

2.5 W

Weight

100g (3.5 oz)

Software Version

Do-more! Designer Programming Software
version 2.1 or later

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules

BX-04THM Thermocouple Input, continued
Data Range Specifications
Selection

Description

Enable 16 bit Unchecked
(15 bit Resolution, Default)1
µV Per
Raw Counts Casting2
Count

Enable 16 bit Checked
(16 bit Resolution)

Type J

°C:
°F:

Type K

°C:
°F:

Type E

°C:
°F:

Type R

°C:
°F:

Type S

°C:
°F:

Type T

°C:
°F:

Type B

°C:
°F:

Type N

°C:
°F:
°C:
°F:

Type C

Casting2

µV Per
Count

WXn:U

0–65535

WXn:U

0.6
1.2

Raw Counts3
−1900
−3100
−2100
−3460
−1500
−2380
650
1490
650
1490
−2300
−380
5290
9840
−700
−940
650
1490

to
to
to
to
to
to
to
to
to
to
to
to
to
to
to
to
to
to

7600
14000
10000
18320
13720
25020
17680
32140
17680
32140
4000
7520
18200
33080
13000
23720
23200
42080

0–39 mVDC

Unipolar 39 mVDC

0–32767

−39–39 mVDC

Bipolar 39 mVDC

−32768 to 32767

−78–78 mVDC

Bipolar 78 mVDC

−32768 to 32767

2.4

0–156 mVDC

Unipolar 156 mVDC

0–32767

0–65535

WXn:U

2.4

−156–156 mVDC

Bipolar 156 mVDC

−32768 to 32767

4.8

0–1.25 VDC

Unipolar 1.25 VDC

0–32767

0–65535

WXn:U

19.1

1.2

4.8

38.1

1. Thermocouple and bipolar ranges default to 16-bit resolution.
2. For more information on Casting refer to Help topic DMD0309 in the Do-more! Designer Software.
3. Temperatures have one implied decimal place (e.g., raw count of -1900 is -190.0°).

Error Flag Specifications
MSB

LSB

1st Byte of unused X Registers

Module Status

Data Not
Valid

Missing
24VDC

Self Test
Failed

Channel 4

Channel 3

Channel 2

Channel 1

Channel 4

Channel 3

Channel 2

Channel 1

2nd Byte of unused X Registers

Channel Out of Range
3rd Byte of unused X Registers

Channel Open (Burn Out)

BRX User Manual, 2nd Edition

8-27

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-04THM Thermocouple Input, continued
Analog Thermocouple/Voltage Input Wiring
2
3
INTERNAL
MODULE CIRCUITRY
4
TC0+
TC0TC1+
5
TC1TC2+
6
TC2TC3+
7
TC38
9
10
11
12
0V
24V+
13
14
15
A
B
C
D
CH0 T/C
INPUT
CH1 T/C
INPUT
CH2 T/C
INPUT
CH3 T/C
INPUT

- +

24VDC
Class 2 or LPS
User Supplied
Power

8-28

ISOLATED ANALOG
CIRCUIT POWER

ISOLATED ANALOG
CIRCUIT COMMON

BRX User Manual, 2nd Edition

TC+
TC-

Chapter 8: BRX Analog I/O Expansion Modules
NOTE: Thermocouple extension wire and proper thermocouple
terminal blocks must be used to extend thermocouples.
AutomationDirect thermocouple wire is recommended.

BX-04THM Thermocouple Input, continued
Thermocouple Input Circuits
Ungrounded/Shielded
Thermocouple

TC+
TC-

Analog Voltage Input Circuits
TC+

4-wire
Voltage
Transmitter
+

TC-

–

AC or DC

Grounded/Shielded
Thermocouple

TC+
TC-

TC+

Load Cell
or
Strain Gauge
+

TC-

–

AC or DC

Infrared
Thermocouple

Transmitter Power Supply

Excitation Power Supply
Voltage Divider

TC+

TC-

NOTE: Thermocouple extension wire and proper thermocouple
terminal blocks must be used to extend thermocouples.
AutomationDirect thermocouple wire is recommended.

Analog Voltage Input Circuits

TCx+
TCx-

NOTE: Shield should be connected only at one end, to ground at the
source device.

TC-

–

AC or DC

Transmitter Power Supply

TC+

Load Cell
or
Strain Gauge
+

For maximum accuracy:
Jumper unused inputs.

TC+

4-wire
Voltage
Transmitter
+

TC-

–

AC or DC

Excitation Power Supply
Voltage Divider
TC+
TC-

For maximum accuracy:
Jumper unused inputs.

TCx+
TCx-

BRX User Manual, 2nd Edition

8-29

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-04THM Thermocouple Input, continued
Software Setup
2
After the module is installed, open the Do-more! Designer programming software version 2.1
or later, connect to the BRX MPU and open the Configure Module dialog as described at the
beginning of this chapter..
3
4
5
6
7
8
9
10
11
12
(1) The module options are divided into subsets across multiple tabs. Click the appropriate tab to
13
edit the configuration.
(2) Module Configuration
14
Name – Each module comes with a default name. This may be changed by the user to better
identify the module if desired.
15
Info – This is the system description of the module. This is static and may not be changed.
(3) Global Settings
A
Channels Enabled – Select how many channels will be used. The default is all channels.
Selecting fewer channels may increase the update frequency. See the module specifications for
B
details.
Temperature Scale – Select either Celcius or Fahrenheit.
C
Burn Out Mode – Select if the Input register should read Low or High on burn out or if burn
out detection should be disabled. Note: Burn Out Mode must be set to Disabled in order to
D
use a Thermocouple Calibrator.
8-30

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules

BX-04THM Thermocouple Input, continued
(4) Global Status Bits
Self Test Failed – This bit will be On if the module has failed its internal self-test. In this case
the module is likely bad and should be replaced.
Missing 24V – This bit will be on if the external 24VDC power is missing. Check the 24VDC
power connection on the module terminal block.
Data Not Valid – This bit will be on if the module does not have the latest configuration
parameters or the module has not been configured at all. Reload the program into the CPU
and power cycle.

(5) Analog Input x
These settings are for each channel of the analog module.
Drop Down menu - Select the range of the analog input here.
(6) WXx
Range – The number of Raw counts for the selected channel on the module
Units/Ct – The amount of temperature or voltage that will equal 1 raw count.
Out of Range – The input register that when On will indicate that the input is outside of the
range selected.
Burn Out – If burn out is enabled, this register will be On when the loop is broken.
(7) RXx
Range – The engineering units to which the raw counts are scaled.
Units/Ct – The number of raw counts that will equal 1 scaled engineering unit.
(8) Enable Scaling from WXx to RXx
WXx Min – The minimum value of the raw counts to scale.
WXx Max – The maximum value of the raw counts to scale.
RXx Min – The minimum value of the engineering units for scaling.
RXx Max – The maximum value of the engineering units for scaling.
Counts/DegF – Use these buttons to change the raw scaling to counts or degrees (C or F).
Clamp RXx – If this box is checked, RXx will clamp at the minimum and maximum scaled
values.

BRX User Manual, 2nd Edition

8-31

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-08DA-1 Analog Current Source Output
Analog Current Source Ouput Specifications
2
3
4
W
Y
5
6
7
8
9
10
11
12
13
14
15
A
B IMPORTANT!
C
D
C

UL
R

I0+
I1+
I2+
I3+
I4+
I5+
I6+
I7+

BX-08DA-1

Terminal Blocks
Sold Separately

Hot-Swapping Information

NOTE: This device cannot
be Hot Swapped.

8-32

Outputs per Module

Commons

Module Signal Output Range

0–20mA, 4–20mA (Default)

Signal Resolution

16-bit, 15-bit (Default)

Output Type

Current Sourcing up to 22mA

Output Value in Fault Mode

~0mA

Maximum Load Impedance

700Ω

Maximum Capacitive Load

1000pF

Allowed Load Type

Grounded

Maximum Continuous Overload

30mA

All Channel Update Rate

1.5 ms per enabled channel

Maximum Inaccuracy

±0.15% of range

Maximum Full Scale Calibration Error

±0.08% of range

Maximum Offset Calibration Error

±0.06% of range

Conversion Method

Successive approximation

Accuracy vs. Temperature

±25PPM / ºC maximum

Maximum Crosstalk

+10μV

Linearity Error (end to end)

±0.06% of range

Output Stability and Repeatability

±0.02% of full range after 10 minute
warmup (typical)

Output Ripple

±0.01% of range/mA

Output Settling Time

200μs

Channel to Backplane Isolation

1800VAC applied for one second

Channel to Channel Isolation

None

Loop Fusing (External)

Fast-acting 0.032A recommended

Backplane Power Consumption

0.1 W

External DC Power Required

Class 2 or LPS power supply
24VDC (±20%)
250mA

Heat Dissipation

8.1 W

Weight

100g (3.5 oz)

Software Version

Do-more! Designer Programming
Software version 2.1 or later

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules

BX-08DA-1 Analog Current Source Output, continued
Data Range Specifications
Selection

Description

Enable 16 bit Unchecked
(15 bit Resolution, Default)
µA Per
Raw Counts
Casting*
Count

Enable 16 bit Checked
(16 bit Resolution)
Raw Counts

Casting*

µA Per
Count

0–20mA

unipolar 0–20mA

0–32767

0.61

0–65535

WYn:U

0.31

4–20mA

unipolar 4–20mA

0–32767

0.49

0–65535

WYn:U

0.24

* For more information on Casting refer to Help topic DMD0309 in the Do-more! Designer Software.

Error Flag Specifications
MSB

LSB

1st Byte of unused X Registers

Module Status

Data Not
Valid

Missing
24VDC

Self Test
Failed

2nd Byte of unused X Registers

Unused

3rd Byte of unused X Registers

Unused

BRX User Manual, 2nd Edition

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13
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A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-08DA-1 Analog Current Source Output, continued
Analog Current Ouput Wiring
2
3
INTERNAL
MODULE CIRCUITRY
4
5
6
7
8
9
10
11
12
13
14
15
A
B
C
D

Analog Current Source Output

1C
I0+
I1+
I2+
I3+

1C
I4+
I5+
I6+
I7+

COM
COM
COM
COM
COM
COM
COM
COM
0V
24V+

24VDC
Class 2 or LPS
User Supplied
Power

8-34

0.032 A

4-20 mA current sourcing
4-20 mA current sourcing
4-20 mA current sourcing
4-20 mA current sourcing
4-20 mA current sourcing
4-20 mA current sourcing
4-20 mA current sourcing
4-20 mA current sourcing

mA Load

CH0 DAC

Ix+

*Fuse

1C/COM

CH1 DAC
CH2 DAC
CH3 DAC
CH4 DAC
CH5 DAC
CH6 DAC
CH7 DAC

ISOLATED ANALOG
CIRCUIT POWER

ISOLATED ANALOG
CIRCUIT COMMON

BRX User Manual, 2nd Edition

*An Edison S500-32-R 0.032 A fast-acting fuse is recommended
for all analog voltage inputs, analog outputs, and current loops.

NOTE: Shield should be connected only at one end, to ground at the
source device.

Chapter 8: BRX Analog I/O Expansion Modules

BX-08DA-1 Analog Current Source Output, continued
Software Setup
After the module is installed, open the Do-more! Designer programming software version 2.1
or later, connect to the BRX MPU and open the Configure Module dialog as described at the
beginning of this chapter..

(1) The module options are divided into subsets across multiple tabs. Click the appropriate tab to
edit the configuration.
(2) Module Configuration
Name – Each module comes with a default name. This may be changed by the user to better
identify the module if desired.
Info – This is the system description of the module. This is static and may not be changed.
(3) Global Settings
Channels Enabled – Select how many channels will be used. The default is all channels.
Selecting fewer channels may increase the update frequency. See the module specifications for
details.
(4) Global Status Bits
Self Test Failed – This bit will be On if the module has failed its internal self-test. In this case
the module is likely bad and should be replaced.
Missing 24V – This bit will be On if the external 24VDC power is missing. Check the 24VDC
power connection on the module terminal block.
Data Not Valid – This bit will be On if the module does not have the latest configuration
parameters or the module has not been configured at all. Reload the program into the CPU
and power cycle.

BRX User Manual, 2nd Edition

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9
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12
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A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-08DA-1 Analog Current Source Output, continued
2
3
4
5
6
(5) Analog Output x
These settings are for each channel of the analog module.
7
Drop Down menu – Select the range of the analog output here.
Enable 16 bit unipolar data – Check this box to change the raw count range from a signed
8
decimal bipolar data format to an unsigned decimal data format. This may require that Casting
be used in the program in order to properly access the data. Refer to the chart of Data Range
9
Specifications earlier in this chapter to see if the registers must be accessed with Casting.
(6) WYx
10
Range – The number of Raw counts for the selected channel on the module
Units/Ct – The amount of current that will equal 1 raw count.
11
Broken Transmitter – The input register that when On will indicate that the loop is broken.
(7) RYx
12
Range – The engineering units to which the raw counts are scaled.
Units/Ct – The number of raw counts that will equal 1 scaled engineering unit.
13
(8) Enable Scaling from RYx to WYx
RYx Min – The minimum value of the engineering units for scaling.
14
RYx Max – The maximum value of the engineering units for scaling.
15
WYx Min – The minimum value of the raw counts to scale.
WYx Max – The maximum value of the raw counts to scale.
A
Counts/mA – Use these buttons to change the raw scaling to counts or milliamps.
Clamp WYx – If this box is checked, WYx will clamp at the minimum and maximum scaled
B
values.
C
D
8-36

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules

BX-08DA-2B Analog Voltage Output
C

UL
R

V0+
V1+
V2+
V3+
V4+
V5+
V6+
V7+

BX-08DA-2B

Terminal Blocks
Sold Separately
Do-more! Designer version 2.1 or higher required.

IMPORTANT!

Analog Voltage Output Specifications
Outputs per Module

Commons

Module Signal Input Range

±10 VDC, ±5 VDC,
0–5 VDC, 0–10 VDC (Default)

Signal Resolution

16-bit, 15-bit (Default)

Output Type

Voltage outputs sourcing/sinking at
10mA (example 10V @ 1kΩ load).

Output Value in Fault Mode

Voltage outputs 0V (Unipolar or Bipolar)

Minimum Load Impedance

1kΩ

Maximum Capacitive Load

1000pF

Allowed Load Type

Grounded

Maximum Continuous Overload

15mA

All Channel Update Rate

3ms

Maximum Inaccuracy

0.2% of range

Maximum Full Scale Calibration
Error

±0.08% of range

Maximum Offset Calibration Error

±0.04% of range

Accuracy vs. Temperature

±25PPM / °C maximum

Maximum Crosstalk

+3µV

Linearity Error (end to end)

±0.01% of range

Output Stability and Repeatability

±0.02% of full range
after 10 min. warmup (typical)

Output Ripple

150 µV/mA

Output Settling Time

200µs

Channel to Backplane Isolation

1800VAC applied for one second

Channel to Channel Isolation

None

Loop Fusing (External)

Fast-acting 0.032A recommended

Backplane Power Consumption

0.1 W

External DC Power Required

Class 2 or LPS power supply
24VDC (±20%)
100mA

Heat Dissipation

3.1 W

Weight

100g (3.5 oz)

Software Version

Do-more! Designer Programming
Software version 2.1 or later

Hot-Swapping Information
NOTE: This device cannot be Hot Swapped.

BRX User Manual, 2nd Edition

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6
7
8
9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-08DA-2B Analog Voltage Output, continued
Data Range Specifications
2
3
4
5
6
7
The module reserves the first 24 bits of unused contiguous space in the X register, aligned to
8
an 8-bit word boundary, for status reporting. Error flags for this module are laid out within its
status register space as described in the following table.
9
Error Flag Specifications
10
MSB
LSB
11
Module Status
12
Unused
13
Unused
14
15
A
B
C
D
Selection

Description

Enable 16 bit Unchecked
(15 bit Resolution, Default)1
µV Per
Raw Counts Casting2
Count

Enable 16 bit Checked
(16 bit Resolution)

Raw Counts

Casting2

µV Per
Count

0–10V

unipolar 10VDC

0–32767

305

0–65535

WYn:U

152

0–5V

unipolar 5VDC

0–32767

152

0–65535

WYn:U

±10V

bipolar 10VDC

−32768 to 32767

305

±5V

bipolar 5VDC

−32768 to 32767

152

1. Bipolar ranges default to 16-bit resolution.
2. For more information on Casting refer to Help topic DMD0309 in the Do-more! Designer Software.

1st Byte of unused X Registers
-

Data Not
Valid

Missing
24VDC

Self Test
Failed

2nd Byte of unused X Registers
-

3rd Byte of unused X Registers
-

8-38

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules

BX-08DA-2B Analog Voltage Output, continued
Analog Voltage Output Wiring
Analog Voltage Output Circuit

INTERNAL
MODULE CIRCUITRY
1C
V0+
V1+
V2+
V3+
1C
V4+
V5+
V6+
V7+

COM
COM
COM
COM
COM
COM
COM
COM
0V
24V+

24VDC
Class 2 or LPS
User Supplied
Power

voltage sink/source
voltage sink/source
voltage sink/source
voltage sink/source
voltage sink/source
voltage sink/source
voltage sink/source
voltage sink/source

*Fuse

VDC
Load

CH0 DAC

0.032 A Vx+
1C/COM

CH1 DAC
Load
Power Supply

CH2 DAC
CH3 DAC

*An Edison S500-32-R 0.032 A fast-acting fuse is recommended
for all analog voltage inputs, analog outputs, and current loops.

CH4 DAC
CH5 DAC

NOTE: Shield should be connected only at one end, to ground at the
source device.

CH6 DAC
CH7 DAC

ISOLATED ANALOG
CIRCUIT POWER

ISOLATED ANALOG
CIRCUIT COMMON

BRX User Manual, 2nd Edition

8-39

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2
3
4
5
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7
8
9
10
11
12
13
14
15
A
B
C
D

Chapter 8: BRX Analog I/O Expansion Modules

1 BX-08DA-2B Analog Voltage Output, continued
Software Setup
2
After the module is installed, open the Do-more! Designer programming software version 2.1
or later, connect to the BRX MPU and open the Configure Module dialog as described at the
beginning of this chapter..
3
4
5
6
7
8
9
(1) The module options are divided into subsets across multiple tabs. Click the appropriate tab to
edit the configuration.
10
(2) Module Configuration
Name – Each module comes with a default name. This may be changed by the user to better
11
identify the module if desired.
Info – This is the system description of the module. This is static and may not be changed.
12
(3) Global Settings
Channels Enabled – Select how many channels will be used. The default is all channels.
13
Selecting fewer channels may increase the update frequency. See the module specifications for
details.
14
(4) Global Status Bits
Self Test Failed – This bit will be On if the module has failed its internal self-test. In this case
15
the module is likely bad and should be replaced.
Missing 24V – This bit will be On if the external 24VDC power is missing. Check the 24VDC
A
power connection on the module terminal block.
Data Not Valid – This bit will be On if the module does not have the latest configuration
B
parameters or the module has not been configured at all. Reload the program into the CPU
and power cycle.
C
D
8-40

BRX User Manual, 2nd Edition

Chapter 8: BRX Analog I/O Expansion Modules

BX-08DA-2B Analog Voltage Output, continued

(5) Analog Output x
These settings are for each channel of the analog module.
Drop Down menu - Select the range of the analog output here.
Enable 16 bit unipolar data – Check this box to change the raw count range from a signed
decimal bipolar data format to an unsigned decimal data format. This may require that Casting
be used in the program in order to properly access the data. Refer to the chart of Data Range
Specifications earlier in this chapter to see if the registers must be accessed with Casting.
(6) WYx
Range – The number of Raw counts for the selected channel on the module
Units/Ct – The amount of voltage that will equal 1 raw count.
(7) RYx
Range – The engineering units to which the raw counts are scaled.
Units/Ct – The number of raw counts that will equal 1 scaled engineering unit.
(8) Enable Scaling from RYx to WYx
RYx Min – The minimum value of the engineering units for scaling.
RYx Max – The maximum value of the engineering units for scaling.
WYx Min – The minimum value of the raw counts to scale.
WYx Max – The maximum value of the raw counts to scale.
Counts/VDC – Use these buttons to change the raw scaling to counts or volts.
Clamp WYx – If this box is checked, WYx will clamp at the minimum and maximum scaled
values.

BRX User Manual, 2nd Edition

8-41

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Chapter 8: BRX Analog I/O Expansion Modules

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BRX User Manual, 2nd Edition

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