CitectSCADA OPC Server allows you to access data available in the CitectSCADA runtime environment (for example from PLCs and databases) through any OPC Client application (v1.0 or v2.0).
When CitectSCADA is used to monitor and control a plant, data from PLCs is collected and displayed in the runtime environment. OPC Clients can access device and tag information through the interface to the OPC Server, which in turn interacts with the CtAPI interface to the Runtime. For details on how to configure the OPC Server, refer to Using OPC Server DA2.0