Poll Engine for #Specific Tags

Generally, the OFSOPC driver activates the item specified in the tag address and relies on the value updates from OFS, but some special OFS items do not provide value updates via subscription. The driver needs to poll these items for the value updates. If the tag address contains any of the following strings, the driver will poll it for value updates:

• #AppliName

• #AppliVersion

• #NbrRequest

• #RefreshDevice

• #AppliOMC

• <<system>>!#ClientAlive

• #TSEventSynchro

• #DeviceIdentity

Note: The OFSOPC driver will poll for value updates only if these tags are subscribed in Plant SCADA. The Plant SCADA tag subscription rate defines the poll rate.