SCADA Device Locking
The system can be configured to apply a SCADA device lock on a SCADA switch when the operator opts to send an Open or Close tele-control to the SCADA system. The device lock is modeled as a condition and is placed on the Viewer when the Look Ahead dialog box is invoked for the SCADA operation.
Note: The lock is only placed if the proposed action is a SCADA Open or Close action (i.e., the lock is not placed for manual actions).
The lock will remain in place until either:
• The request is sent to SCADA
• The request is canceled
• The device lock times out.
An SRS Rule (ScadaDeviceLockTimeout) controls how long the lock can be placed before expiring and being removed by the system. The operator who has the lock is notified that the lock has been removed and the system cannot guarantee that another operator may not operate the device.
If another operator attempts to send a SCADA operation to the device when a lock is applied, the system will prevent them and notify them of who currently has the device lock.
An operator can manually remove a device lock by selecting the condition in the Condition Summary and deleting it. The owner of the lock will be notified via a dialog box that the lock has been manually removed and gives an indication of the user who removed the lock.
If the device locked by a user is involved in an active automatic FLISR event, then the system will automatically remove the device lock from the user and notify them. The FLISR event will lock all SCADA switches upfront, removing any existing user locks, and remove the locks once the FLISR plan has completed.
The system will only apply locks to specific device classes. The list of device classes that will have locks applied is configured with an SRS Rule (ScadaLockableClasses).