Do you mean, it's connected directly to the KRC through the X42 connector?
AFAIK, that's only relevant when the MasRef switch is connected to a Safety PLC, and the Safety PLC program passes the MasRef contact signals to the KRC via the JR bit.
Yes - I understood the JR bit was only relevant to a PLC. Thanks for clearing that up.
Yes - the Reference Switch is connected directly to the KRC through the X42 to the CCU.