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Rockwell Automation Publication ICSTT-RM448J-EN-P - April 2018
Chapter 4
Before You Begin
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).
Estimating Power
Consumption
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
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.
Item
Number of
Modules
Power
Consumption
Subtotal
T9110 Processor Module
× 8.0 W
=
T9401 Digital Input Module 24 Vdc, 8 channel
× 3.3 W
=
T9402 Digital Input Module 24 Vdc, 16 channel
× 4.0 W
=
T9431 Analogue Input Module, 8 channel
× 3.3 W
=
T9432 Analogue Input Module, 16 channel
× 4.0 W
=
T9451 Digital Output Module, 24 Vdc, 8 channel
× 3.0 W
=
T9482 Analogue Output Module, 8 channel, isolated
× 3.6 W
=
Total:
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".
