26 Rockwell Automation Publication 5069-UM002A-EN-P - January 2019
Chapter 1 CompactLogix 5480 System
SA Power Bus
When the SA power source is turned on, the following occurs.
1. The CompactLogix 5480 controller draws current from the SA power
bus and passes the remaining current through to the next module.
2. The next module completes one of the following tasks.
– If the module uses SA power, the module draws current from the SA
power bus and passes the remaining current through to the next
module.
– If the module does not use SA power bus current, the module passes
the remaining current through to the next module.
3. The process continues until all SA power bus current needs are met for
the modules on the SA power bus.
Remember, if your system includes AC and DC modules that require SA
power, you must complete the following:
• Use a 5069-FPD field potential distributor to establish a separate SA
power bus.
• Separate the module types on the isolated SA power buses.
For more information on the current that the Compact 5000 I/O modules
draw from the SA power bus, see the Compact 5000 I/O Modules and
EtherNet/IP Adapters Specifications Technical Data, publication
5069-
TD001.
IMPORTANT The level of current that the controller draws from the SA power bus
is negligible. It draws 10 mA when DC power is used and 25 mA
when AC power is used.
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