Rockwell Automation Publication 5069-UM002A-EN-P - January 2019 23
CompactLogix 5480 System Chapter 1
MOD Power Bus
When the MOD power source is turned on, the following occurs.
1. The CompactLogix 5480 controller draws current from the MOD
power bus and passes the remaining current through to the next module.
2. The next module draws MOD power bus current and passes the
remaining current through to the next module.
3. The process continues until MOD power bus current needs are met for
all modules in the system.
For more information on the current that the Compact 5000 I/O modules
draw from the MOD power bus, see the Compact 5000 I/O Modules and
EtherNet/IP Adapters Specifications Technical Data, publication
5069-
TD001.
SA Power
SA power provides power to devices that are connected to some of the
Compact 5000 I/O modules in the CompactLogix 5480 system. SA power is
connected to the controller via an SA power RTB.
Remember the following:
• Some Compact 5000 I/O modules draw current from the SA power bus
and pass the remaining current to the next module.
• Some Compact 5000 I/O modules only pass current along the SA
power bus to the next module.
• A CompactLogix 5480 system can have multiple SA power buses. The
first SA power bus starts at the controller and passes across the I/O
modules that are installed to the right of the controller.
You use a 5069-FPD field potential distributor to establish a new SA
power bus. The new SA power bus is isolated from the SA power bus to
its left in the system.
For more information on how to use a 5069-FPD field potential
distributor in a CompactLogix 5480 system, see
page 29.
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