Rockwell Automation 1785-RC Application Relay Interface Installation Instruction - Manual (Page 2)

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,PSRUWDQW Use of the relay cartridge requires the Series E, revision E
firmware release. If your processors are not already at this
revision level, contact Rockwell Automation Technical
Support to receive this firmware.
Install the Relay Cartridge
1. Turn off power to the I/O chassis and PLC-5 controller.
2. Insert the relay cartridge firmly but gently into the controller (with the
keying pins in the down position) until the cartridge is fully seated in
the controller mating connector.
!
ATTENTION: Do not insert or remove the relay cartridge
while power is applied to the chassis and/or controller.
Insertion or removal under power can cause memory loss
and processor fault.
Keying pin