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Chapter 4
Before You Begin
Estimating Power
Consumption
78
Power Distribution Protection
The power distribution circuit for each field input and for each output module
must be protected, externally to the controller. Rockwell Automation
recommend that power distribution must meet national and local panel wiring
protection standards.
Digital Output Field Power
Special fusing arrangements are required for Digital Output field supplies for
UL, ATEX and IECEx approved installations, (see topic on field loops for
Digital Output Modules).
To estimate the power supply requirements (power supply sizing) you need to
know the power consumption of all the modules. Use the following table to
estimate the system power consumption.
Table 6 - Module Supply Power Consumption
Item
T9110 Processor Module
T9401 Digital Input Module 24 Vdc, 8 channel
T9402 Digital Input Module 24 Vdc, 16 channel
T9431 Analogue Input Module, 8 channel
T9432 Analogue Input Module, 16 channel
T9451 Digital Output Module, 24 Vdc, 8 channel
T9482 Analogue Output Module, 8 channel, isolated
IMPORTANT The above figures are worst case values calculated from the range of
operating voltages and currents. If your system is required to meet UL/CSA
standards the power consumption and the corresponding electrical ratings
must not exceed the maximum electrical ratings given in the table included
in the topic "Backplane Electrical Ratings".
Field Power Consumption
To estimate overall controller power dissipation it is necessary to include the
field power component dissipated within the controller. Refer to the table
"Field Loop Power Heat Dissipation". The field power requirements should be
calculated separately and is dependent on the number and type of field
elements. Refer to the specifications for the Digital and Analogue output
modules for details of the channel output electrical specifications.
Rockwell Automation Publication ICSTT-RM448J-EN-P - April 2018
Number of
Power
Modules
Consumption
× 8.0 W
× 3.3 W
× 4.0 W
× 3.3 W
× 4.0 W
× 3.0 W
× 3.6 W
Total:
Subtotal
=
=
=
=
=
=
=
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