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Opc redundancy common scenarios
This document discusses different configurations for providing redundancy when using OPC (OLE for Process Control) servers and clients. It describes four common scenarios: 1) no redundancy with a single PLC, OPC server, and client; 2) redundancy on one computer with redundant PLCs and OPC servers; 3) networked redundancy across multiple computers with redundant PLCs, OPC servers, and DataHubs; 4) multiple client redundancy across networks with redundant PLCs, OPC servers, and multiple OPC clients connected via DataHubs.
Opc redundancy common scenarios
- 1. Redundancy for OPC using the Cogent DataHub (common scenarios)
- 2. No Redundancy PLC OPC Server OPC Client Process • One process, one client • Single data path (PLC and OPC server)
- 3. Redundancy – onecomputer Redundant PLCs Redundant OPC Servers DataHub OPC Client Process configured for redundancy • One process, one client, one computer • Redundant data paths
- 4. Networked Redundancy Redundant OPC DataHubs for Network Redundant PLCs or Servers tunnelling Internet Process DataHub for OPC Client tunnelling and redundancy • Redundant data paths • 2 OPC server machines, 1 client machine
- 5. Multiple Client Redundancy DataHub OPC Client Redundant PLCs Redundant OPC DataHubs for Servers tunnelling Process DataHub OPC Client • Redundant data paths • 2 OPC server machines, 2 client machines
- 6. Multiple Client Redundancy DataHub OPC Client Redundant PLCs Redundant OPC DataHubs for Servers tunnelling Process DataHub OPC Client • Redundant data paths • 2 OPC server machines, 2 client machines