Off Scan (WITS Point)

Associated with: WITS Database Points

Security permission required to access this pick action: Off/On Scan

WARNING

UNEXPECTED BEHAVIOR OF APPLICATION

Use the Off Scan pick action on a database point with care—always check the point’s current activity before deciding whether to use this action. Using the Off Scan action will mean that the Field Device will not log data or generate DNP3 events for the point. For this reason, you need to be certain that other users do not require the point's data before you put the point Off Scan.

WARNINGFailure to follow these instructions can result in death, serious injury, or equipment damage.

You can use the Off Scan action to set a point that is currently 'on scan' to 'off scan'. When a point is 'off scan':

• The Field Device does not log data or generate events for the point
• The point's ONLINE object flag clears and any action for the ONLINE flag is performed (see DNP3 Object Flag Actions).
• Configuration changes to the point can still be applied.
• Output points cannot be controlled (the Field Device will reject any control).

You would use the Off Scan action on a point when you want to stop a point's data from being reported. For example, if an instrument develops a fault, an operator may put the point for the instrument to 'off scan' (as this will suppress the data being reported for the instrument). When the instrument has been repaired or replaced, the On Scan action can be used to set the point back to 'on scan'.