64 Rockwell Automation Publication 1769-UM021I-EN-P - May 2018
Chapter 3 Install the CompactLogix 5370 L2 Controller
6. Strip 8 mm (0.31 in.) insulation from the end of the wire that you
connect to the COM terminal on the controller.
7. Connect the wire from the 24V DC- terminal on the external 24V DC
power source to the COM terminal on the controller.
The following graphic shows an external 24V DC power source that is
connected to a CompactLogix 5370 L2 controller.
IMPORTANT If your application requires a power control device, for example, a switch or
relay, between the external power supply and the embedded power supply
of the CompactLogix 5370 L2 controller to control when the controller is
powered, you must install the power control device at the +24VDC terminal
on the controller.
If you install the power control device at the COM terminal, the
CompactLogix 5370 L2 controller cannot power up or power down properly.
IMPORTANT When you remove power from the CompactLogix 5370 L2 controller to cycle
power, the OK status indicator of the controller remains lit briefly as the
controller passes through its shutdown sequence.
Do not reapply power from the external power supply to the embedded
power supply of the CompactLogix 5370 L2 controller until after the OK
status indicator of the controller is off.
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