OPC Interface Service (OPCIS)

The OPC Interface Service (OPCIS) is a specialized CygNet current value service that provides connectivity of CygNet Software to a computer using the OPC Data Access (DA) or OPC Historical Data Access (HDA) specification-compliant server. The OPCIS is an OPC client associated with an external OPC server. It can have a one-to-one or one-to-many relationship with OPC servers through OPC groups. OPCIS features include:

• Retrieval of current values for up to 500,000 data points from an OPC server
• Write data to OPC servers
• Connect to local or remote OPC servers
• Configurable update rate for all OPC points
• Grouping for custom update rates and point processing

CygNet supports three OPC servers: a CygNet OPC (DA) Server, a CygNet OPC HDA Server, and a CygNet OP UA Server.

See OPCIS vs OPC EIEs for a feature-by-feature comparison of the OPCIS with the OPC EIEs (OPC EIE, OPC Comm EIE, OPC Lufkin EIE, and OPC Weatherford EIE) to help you decide which OPC option best suits the requirements of your enterprise.

For information about automatic backup of the OPCIS, see Current Value Services and Common Alarm Service Backup.

See OPC Interface Service for more information.