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BRX MPU Power Budgeting

Appendix

C

In This Appendix...
BRX MPU Power Budget...............................................................................................................................C-2
Power Budget Form...................................................................................................................................C-2
Power Budget Worksheet..........................................................................................................................C-3
BRX MPU Available Expansion Power........................................................................................................C-3
BRX I/O Controller Available Expansion Power........................................................................................C-4
BRX MPU POM Power Consumed.............................................................................................................C-5
BRX MPU Expansion Module Power Consumed.......................................................................................C-5
Power Budget Examples.............................................................................................................................C-7

Appendix C: BRX MPU Power Budgeting

1 BRX MPU Power Budget
The BRX MPU will automatically calculate the power budget, online or offline, taking into account the added
2
expansion modules. However, since there is a limited amount of power available to supply the expansion
modules, the power budget should be taken into account when designing a BRX system, to be sure that the
3
system will perform as expected.
4
A general rule of thumb is that when there are 32 or more points of relay expansion modules in a system, a
power budget calculation must be performed to ensure that there is enough available power to accommodate
5
all expected modules.
6
On the following pages you will find a worksheet and power budget tables to help you determine your
system total power budget requirement. If the calculations exceeds the total available power, you may need
7
to consider using an additional MPU or using a Remote I/O solution to satisfy the system requirements.
8
Examples are also included to help show how the calculations should be performed.
9
NOTE: The Power Budget calculation applies only to backplane power supplied by the MPU or Remote I/O controller.
Some expansion modules also require external power supplied directly to the module, which is not included in this
10
calculation.
11
WARNING: It is extremely important to calculate the power budget. If you exceed the power budget, the system
may operate in an unpredictable manner which may result in a risk of personal injury or equipment damage.
12
13 Power Budget Form
1. Find the Watts available for the BRX MPU that you will be using. Put this value in line 1 - MPU
14
section of the worksheet.
2. If you are using a POM (Pluggable Option Module), find the watts consumed and put this value in
15
line 2 - POM section of the worksheet.
A
3. For each Expansion Module that you will be using, find the watts consumed and put this value in the
appropriate slot that the module will reside in, lines 3 through 10.
B
4. Add the values located in the POM Watts and Slot 1 through 8, lines 2 through 10. Write the value
of this sum in line 11 - Total Watts Consumed.
C
5. Subtract line 11 - Total Watts Consumed from line 1 - MPU Watts Available. Write this value in line
D
12 - Watts Remaining.
6. If the value in line 12 - Watts Remaining is a negative number, your system is consuming more Watts
than the MPU is capable of providing. This system would be unsafe as designed. You will need to
reconsider your design. If the remaining wattage is zero or more than zero, the system design is good.

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BRX User Manual, 3rd Edition

Appendix C: BRX MPU Power Budgeting

Power Budget Worksheet
Power Budget Worksheet
Line

Item

1

MPU

2

POM

3

Slot 1

4

Slot 2

5

Slot 3

6

Slot 4

7

Slot 5

8

Slot 6

Part #

Watts

9

Slot 7

10

Slot 8

11

Total Watts Consumed (Add lines 2 thru 10)

12

Watts Remaining (Line 1 − line 11)

WARNING: It is extremely important to calculate the power budget. If you exceed the power budget, the system
may operate in an unpredictable manner which may result in a risk of personal injury or equipment damage.

BRX MPU Available Expansion Power
The following tables show the available power for each of the BRX MPUs. Use the wattages shown as the
total available power when calculating the power budget.

MPU Total Power Available
# Built-in Inputs

# Built-in Outputs

Total Available
Power (W)

BX-DM1E-M

0

0

21.3

BX-DM1E-M-D

0

0

21.3

BX-DM1-10ED1-D

6

4

8.5

BX-DM1-10ED2-D

6

4

8.5

BX-DM1-10ER-D

6

4

8.3

BX-DM1-10AR-D

6

4

8.3

BX-DM1E-10ED13-D

6

4

7.3

BX-DM1E-10ED23-D

6

4

7.3

BX-DM1E-10ER3-D

6

4

7.0

BX-DM1E-10AR3-D

6

4

7.0

BX-DM1-18ED1

10

8

20.2

BX-DM1-18ED2

10

8

20.2

BX-DM1-18ER

10

8

19.6

BX-DM1-18AR

10

8

19.6

BX-DM1-18ED1-D

10

8

20.2

BX-DM1-18ED2-D

10

8

20.2

BX-DM1-18ER-D

10

8

19.6

Model

BX 10

BX 10E

BX 18

Table continued on next page

BRX User Manual, 3rd Edition

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12
13
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B
C
D

Appendix C: BRX MPU Power Budgeting

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

MPU Total Power Available (continued)
# Built-in Inputs

# Built-in Outputs

Total Available
Power (W)

BX-DM1E-18ED13

10

8

18.8

BX-DM1E-18ED23

10

8

18.8

BX-DM1E-18ER3

10

8

17.9

BX-DM1E-18AR3

10

8

17.9

BX-DM1E-18ED13-D

10

8

18.8

BX-DM1E-18ED23-D

10

8

18.8

BX-DM1E-18ER3-D

10

8

17.9

BX-DM1-36ED1

20

16

18.7

BX-DM1-36ED2

20

16

18.7

BX-DM1-36ER

20

16

17.6

BX-DM1-36AR

20

16

17.6

BX-DM1-36ED1-D

20

16

18.7

BX-DM1-36ED2-D

20

16

18.7

BX-DM1-36ER-D

20

16

17.6

BX-DM1E-36ED13

20

16

16.4

BX-DM1E-36ED23

20

16

16.4

BX-DM1E-36ER3

20

16

15.3

BX-DM1E-36AR3

20

16

15.3

BX-DM1E-36ED13-D

20

16

16.5

BX-DM1E-36ED23-D

20

16

16.5

BX-DM1E-36ER3-D

20

16

15.3

Model
BX 18E

BX 36

BX 36E

BRX I/O Controller Available Expansion Power
The following table shows the available power for each of the BRX I/O controllers. Use the wattages shown
as the total available power when calculating the power budget.

I/O Controller Total Power Available
# Built-in Inputs

# Built-in Outputs

Total Available
Power (W)

BX-EBC100-M

NA

NA

21.3

BX-EBC100-M-D

NA

NA

21.3

BX-DMIO-M

NA

NA

21.3

BX-DMIO-M-D

NA

NA

21.3

BX-MBIO-M

NA

NA

21.3

BX-MBIO-M-D

NA

NA

21.3

Model
BX-EBC100

BX-DMIO

BX-MBIO

C-4

BRX User Manual, 3rd Edition

Appendix C: BRX MPU Power Budgeting

BRX MPU POM Power Consumed
The following chart shows the power consumed by each of the BRX POMs. Use the wattages shown as the
amount to be subtracted from the total available wattage when calculating the power budget.

POM Power Consumption
Model

Consumption (W)

BX-P-SER2-RJ12

0.2

BX-P-SER2-TERM

0.2

BX-P-SER4-TERM

0.2

BX-P-USB-B

0.1

BX-P-ECOMLT

0.4

BRX MPU Expansion Module Power Consumed
The following tables show the power consumed by each of the BRX Expansion Modules. Use the wattages
shown as the total amount to be subtracted from the available wattage when calculating the power budget.
BRX Discrete Input Expansion Modules

BRX Discrete Input Expansion Modules Power Consumption
Model

Inputs/Module

Outputs/ Module

Consumption (W)

BX-08NA

8

0

0.2

BX-08NB

8

0

0.2

BX-08ND3

8

0

0.2

BX-08NF3

8

0

0.2

BX-08SIM

8

0

0.2

BX-12NA

12

0

0.3

BX-12NB

12

0

0.3

BX-12ND3

12

0

0.3

BX-16NA

16

0

0.3

BX-16NB

16

0

0.3

BX-16ND3

16

0

0.3

BX-32ND3

32

0

0.4

BRX User Manual, 3rd Edition

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B
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Appendix C: BRX MPU Power Budgeting

BRX Discrete Output Expansion Modules

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

BRX Discrete Output Expansion Modules Power Consumption
Model

Inputs/ Module

Outputs/ Module

Consumption (W)

BX-05TRS

0

5

1.8

BX-08TA

0

8

0.4

BX-08TD1

0

8

0.4

BX-08TD2

0

8

0.4

BX-08TR

0

8

1.7

BX-12TA

0

12

0.5

BX-12TD1

0

12

0.5

BX-12TD2

0

12

0.5

BX-12TR

0

12

2.5

BX-16TD1

0

16

0.5

BX-16TD2

0

16

0.5

BX-16TR

0

16

3.4

BX-32TD1

0

32

1.0

BX-32TD2

0

32

1.0

BRX Discrete Input/Output Combination Expansion Modules

BRX Discrete Combination Expansion Modules
Power Consumption
Model

Inputs/Module

Outputs/Module

Consumption (W)

BX-08CD3R

4

4

1.0

BX-12CD3D1

8

4

0.3

BX-12CD3D2

8

4

0.3

BX-16CD3D1

8

8

0.4

BX-16CD3D2

8

8

0.4

BRX Analog Input/Output and Temperature Expansion Modules

BRX Analog Expansion Modules Power Consumption
Type

C-6

Model

Inputs/Module

Outputs/Module

Consumption (W)

In

BX-04AD-1

4

0

0.1

In

BX-04ADM-1

4

0

0.1

In

BX-08AD-1

8

0

0.1

In

BX-04AD-2B

4

0

0.1

In

BX-08AD-2B

8

0

0.1

In

BX-04THM

4

0

0.1

In

BX-08THM

8

0

0.1

In

BX-06RTD

6

0

0.1

In

BX-08NTC

8

0

0.1

Out

BX-04DA-1

0

4

0.1

Out

BX-08DA-1

0

8

0.1

Out

BX-04DA-2B

0

4

0.1

Out

BX-08DA-2B

0

8

0.1

BRX User Manual, 3rd Edition

Appendix C: BRX MPU Power Budgeting

Power Budget Examples
Example 1

Power Budget Worksheet
Line

Item

1

MPU

2

POM

3
4

Part #

Watts

BX-DM1-18ED1

20.20

Slot 1

BX-08ND3

0.20

Slot 2

BX-16ND3

0.30

5

Slot 3

BX-16TR

3.40

6

Slot 4

BX-16TR

3.40

7

Slot 5

8

Slot 6

9

Slot 7

10

Slot 8

11

Total Watts Consumed (Add lines 2 thru 10)

7.30

12

Watts Remaining (Line 1 − line 11)

12.90

This example shows that the selected configuration is within the power budget. This is a sound configuration
and will work as designed.
WARNING: It is extremely important to calculate the power budget. If you exceed the power budget, the system
may operate in an unpredictable manner which may result in a risk of personal injury or equipment damage.

Example 2

Power Budget Worksheet
Line

Item

Part #

Watts

1

MPU

BX-DM1E-36ER3

15.30

2

POM

BX-P-ECOMLT

0.40

3

Slot 1

BX-08NA

0.20

4

Slot 2

BX-16ND3

0.30

5

Slot 3

BX-16ND3

0.30

6

Slot 4

BX-16TD1

0.50

7

Slot 5

BX-16TD1

0.50

8

Slot 6

BX-16TR

3.40

9

Slot 7

BX-05TRS

1.80

10

Slot 8

BX-05TRS

1.80

11

Total Watts Consumed (Add lines 2 thru 10)

9.20

12

Watts Remaining (Line 1 − line 11)

6.10

This example shows that the selected configuration is within the power budget. This is a sound configuration
and will work as designed.
WARNING: It is extremely important to calculate the power budget. If you exceed the power budget, the system
may operate in an unpredictable manner which may result in a risk of personal injury or equipment damage.

BRX User Manual, 3rd Edition

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C
D

Appendix C: BRX MPU Power Budgeting

Example 3

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

Power Budget Worksheet
Line

Item

Part #

Watts

1

MPU

BX-DM1E-36ER3

15.30

2

POM

BX-P-SER2-TERM

0.20

3

Slot 1

BX-16NA

0.30

4

Slot 2

BX-16NA

0.30

5

Slot 3

BX-16NA

0.30

6

Slot 4

BX-16TR

3.40

7

Slot 5

BX-16TR

3.40

8

Slot 6

BX-16TR

3.40

9

Slot 7

BX-16TR

3.40

10

Slot 8

BX-16TR

3.40

11

Total Watts Consumed (Add lines 2 thru 10)

18.10

12

Watts Remaining (Line 1 − line 11)

-2.80

This example shows that the selected configuration will exceed the power budget. This is an unsafe
configuration and will not work as designed. One way to correct this is to add Remote I/O to this system
for additional I/O capability.
WARNING: It is extremely important to calculate the power budget. If you exceed the power budget, the system
may operate in an unpredictable manner which may result in a risk of personal injury or equipment damage.

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