[IOServer]AlwaysCallStopUnit

Determines whether Plant SCADA attempts to call the StopUnit function for a driver when the unit goes offline so as to release resources allocated for an I/O Device.

The StopUnit call releases resources allocated for a PLC. Under normal circumstances, this occurs when the PLC is online at shutdown, or disabled. Since the unit may not get a StopUnit when it is offline at shutdown, its resources may not have been released and Plant SCADA crashes can occur.

By default this parameter is set to 1 and commands that a StopUnit is called. This may prevent crashes at shutdown. Usually if setting AlwaysCallStopUnit, you would set AlwaysCallStopChannel.

Allowable Values:

• 0 - Stop Unit is not called

• 1 - StopUnit is called

Default Value:

1

See Also

IOServer Parameters