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Usually, the D2000 SAS process is not run in multiple instances, but there can be multiple SAS processes (e.g. Srv1.SAS and Srv2.SAS), especially in redundant systems where the SAS servers run on dedicated redundant servers (e.g. in the DMZ to connect the D2000 HI clients from external networks). In this mode:
- The D2000 HIs are configured to connect to two (or more) SAS servers - ideally with different clients having different orders of IP addressaddresses/server name orders so that names specified to spread the load is spread across all SAS servers.
- After startup, D2000 SAS creates a connection to an active D2000 Server (HOT).
- After changing the active D2000 Server, D2000 SAS will connect to the new active D2000 Server.
- After a D2000 HI connection to a D2000 SAS process is lost, the D2000 HI may terminate (if it was started with the /S parameter) or try to reconnect as if running in a redundancy group (/RD or /RF parameters).
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- External systems are configured to connect to two (or more) OPC/OPC UA servers - ideally so that with different clients have having different orders of IP addressaddresses/server name order so that names specified to spread the load is spread across all OPC/OPC UA servers.
- D2000 OPC Server/D2000 OPC UA Server establishes a connection to an active D2000 Server (HOT) after starting.
- After changing the active D2000 Server, the D2000 OPC Server/D2000 OPC UA Server will connect to the new active D2000 Server.
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