A robot that has been running for years has stopped asserting the Controller Ready bit as part of the Automatic External interface with the PLC. Does anyone understand the conditions required by the KSS to assert the signal? I checked of the hardware inside the cabinet looks normal and the perimeter gates and safety devices are in a good state.
The faulted robot is a KRC4 NA UL controller, KSS 8.3.17 with Tech Packages Safe Operation 3.2 and RSI 3.3.
The second robot in the cell interfaced to the same PLC is working fine.
Any ideas on what to check would be appreciated!