Rockwell Automation Publication 5069-UM002A-EN-P - January 2019 31
CompactLogix 5480 System Chapter 1
• The actual current in a Compact 5000 I/O system changes based on the
operating conditions at a given time.
For example, the SA power bus current draw on some modules is
different if all channels power field devices or half of the channels power
field devices.
• Some Compact 5000 I/O modules use field-side power but do not draw
it from a SA power bus. The modules receive field-side power from an
external power supply that is connected directly to the I/O module.
For example, the 5069-OB16 and 5069-OB16F modules use Local
Actuator (LA) terminals on the module RTB, that is, LA+ and LA–
terminals for all module channels.
In this case, you can use the same external power supply that is
connected to the SA power RTB on the controller to the LA+ and LA–
terminals.
IMPORTANT You must consider the current limit of an external power supply if it
provides power to the SA power RTB on the controller and the LA+
and LA– terminals on a 5069-OB16 or 5069-OB16F module.
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