Applies To:
  • CitectSCADA 5.xx
  • CitectHMI 5.xx

For diallable remote I/O devices after doing IODeviceControl mode 9 (so the schedule is disabled).

IODeviceControl mode 7 will connect but if Citect fails to bring the unit online (e.g. the PLC is disconnected from the remote modem) then it will never hang up the connection. The usual method to disconnect after mode 7 would be to use mode 8 but this will not work in this case.


To hang up the connection you must use IODeviceControl mode 1 (to disable the I/O device)

For normal scheduled remote I/O then the following citect.ini parameter would resolve the situation


but this does not apply when you force a connection with IODeviceControl mode 7.