Alspa C80-35 24 Vdc Input, Neg/Pos Logic, 1 ms ... - GE Fanuc PLC

System OperationThe operation of the Key Switch has the same safeguards and checks before the PLC goes to RUN mode just likethe existing transition to RUN mode; i.e., the PLC will not go to RUN mode via Key Switch input when the PLCis in STOP/FAULT mode. However, you can clear non-fatal faults and put the PLC in RUN mode through the useof Key Switch.If there are faults in the fault tables that are not fatal (i.e., they do not cause the CPU to be placed in theSTOP/FAULT mode), then the CPU will be placed in RUN mode the first time you turn the key from Stop to Runand the fault tables will NOT be cleared.If there are faults in the fault table that are fatal (CPU in STOP/FAULT mode), then the first transition of the KeySwitch from the STOP position to the RUN position will cause the CPU RUN light to begin to flash at 2 Hz rateand a 5 second timer will begin. The flashing RUN light is an indication that there are fatal fault(s) in the faulttables. In which case, the CPU will NOT be placed in the RUN state even though the Key Switch is in RUN position.1.6.2. Clearing the Fault Table with the Key SwitchIf you turn the key from the RUN to STOP and back to RUN position during the 5 seconds when the RUN lightis flashing this will cause the faults to be cleared and the CPU will be placed into RUN mode. The light will stopflashing and will go solid ON at this point. The switch is required to be kept in either RUN or STOP position forat least 1/2 second before switching back to other position to take effect.NoteIf you allow the 5 second timer to expire (RUN light stops flashing) the CPUwill remain in its original state, STOP/FAULT mode, with faults in the faulttable. If you turn the Key Switch from the STOP to RUN position again at thistime, the process will be repeated with this being the first transition.ALS 52102 c–en Alspa C80–35, C80–25 and C80–05 PLCs Reference ManualPage 2–13