Rockwell Automation Publication 5069-UM002A-EN-P - January 2019 21
CompactLogix 5480 System Chapter 1
Power begins at the controller and passes across the Compact 5000 I/O
module internal circuitry via power buses.
MOD power passes across a MOD power bus, and SA power passes across a SA
power bus. The MOD power bus and SA power bus are isolated from each
other.
For more information on how to connect MOD power and SA power, see the
CompactLogix 5480 Controllers Installation Instructions, publication
5069-IN019.
MOD Power
MOD power is a DC power source that is required to operate the
CompactLogix 5480 system.
Remember the following:
• Every module in the CompactLogix 5480 system draws current from the
MOD power bus and passes the remaining current to the next module.
• MOD power lets Compact 5000 I/O modules transfer data and the
CompactLogix 5480 controller execute logic.
• A CompactLogix 5480 system uses only one MOD power bus.
IMPORTANT
We recommend that you use separate external power supplies for MOD
power and SA power, respectively. This practice can help to prevent
unintended consequences that can result if you use one supply.
If you use separate external power supplies, the loss of power from one
external power supply does not affect the availability of power from the
other supply. For example, if separate external power supplies are used and
SA power is lost, MOD power remains available for the CompactLogix 5480
controller and Compact 5000 I/O modules.
IMPORTANT You can only use DC power on the MOD power bus. Do not connect AC power
to the MOD power bus.
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