State Industries GFK-0827 manual Unit Selection Pushbutton, RCM Connectors

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LOCALSYSTEM ACTIVE

Indicates whether the local unit is the controlling (or active) unit in a redundancy system. It is the responsibility of the local unit to set the state of this LED at least once during each sweep; if the local unit is unable to set (or fails to set) the state of the LED, the hardware will force the LED to off after the timer has timed out.

REMOTE SYSTEM READY

Indicates whether the remote unit is ready to become the active unit in a redundant PLC configuration. If the LED is on, the remote unit has been configured for redundancy, is in RUN mode, and has performed sufficient initialization, diagnostics, and hand±shaking to take control of the redundant system if selected as the active unit. It is the responsibility of the remote unit to set the state of this LED at least once during each sweep; if the remote unit is unable to set (or fails to set) the state of the LED, the hardware will force the LED to off after the timer has timed out.

REMOTE SYSTEM ACTIVE

Indicates whether the remote unit is the controlling (or active) unit in a redundancy scheme. It is the responsibility of the remote unit to set the state of this LED at least once during each sweep; if the remote unit is unable to set (or fails to set) the state of the LED, the hardware will force the LED to off after the timer has timed out.

Unit Selection Pushbutton

The module has a momentary pushbutton switch which when depressed for 1 second and released allows you to manually switch control from the active unit to the backup unit if the backup unit is READY. The status of each pushbutton is checked by the PLC CPU software. The switch between units can also be controlled through user logic implementation of a SVC_REQ function that is activated by user logic. After a switch has been requested, you must wait 10 seconds before requesting another switch.

RCM Connectors

The RCM has two connectors mounted on the front of the board. The top connector is the only one used. It is connected via an I/O cable with built-in termination to the last rack of the other PLC system. If no expansion rack is used, it is connected to the lower connector on the Bus Transmitter Module of the other system. The I/O cable with built-in termination is available in two lengths:

HIC697CBL811, 10 feet (3 meters)

HIC697CBL826, 25 feet (7.5 meters)

GFK-0827 Chapter 2 System Components 21