Rockwell Automation 1785-RC Application Relay Interface Installation Instruction - Manual (Page 3)

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Note: If the relay cartridge is not inserted into the PLC-5 processor, the
processor will operate normally, but will not exhibit any of the necessary
relay cartridge functions
.
3. Remove the black screw on the lower Communication Interface Plug
on the PLC-5 controller.
4. Hold the cartridge retention bracket over the relay cartridge and position
the bracket to align the screw holes of the bracket and the
Communication Interface Plug.
5. Replace the screw and tighten securely.
This bracket holds the relay cartridge in place when you detach the
connector from the relay cartridge.
18590-M
Relay cartridge
Keying pin
Removable
Retention bracket
connector
Screw