Server duplication operation

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Manual > Monitoring system construction guide > System installation and operation > System configuration and operation (runtime execution) > System configuration and operation type >

Server duplication operation

What is duplex function?

FA-Server provides a function for operating FA-Server in a duplicated configuration. With the FA-Server duplex function, you can prepare two PCs, a main PC and a standby PC, and run FA-Server as the main and sub, allowing you to make various server processes, such as communication with PLC and logging, redundant.

 

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When operating in a redundant configuration, server processes are executed only on the main FA-Server, and the sub FA-Server is in a standby state until a redundancy switch occurs. When a redundancy switch occurs, the sub FA-Server that was on standby until then is automatically promoted to the main and starts the server process.
 
In addition, the FA-Client displaying the client screen will automatically connect to the PC that is currently running FA-Server as the main (either the main PC or the standby PC). When duplication is switched between the main and sub, the FA-Client will follow the main/sub switch and automatically switch the communication connection.

 

 

 

 

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The "Unit" settings defined for communicating with PLC etc. also have a duplex setting item, but this setting is a function to support a PLC (CPU) duplex configuration. This section only describes matters related to FA-Server duplexing, and does not explain PLC duplexing. For details on this function, please refer to the Device Connection Reference "PLC Duplex Setting".
 

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Example of operation configuration

In a duplicated server configuration, FA-Server runs on each of the two PCs. During normal operation, the main side runs and the sub side is in standby mode. FA-Client automatically connects to the running FA-Server and displays the client screen.

 

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License for duplication

When operating FA-Server in a duplicated configuration, a license key is required for each FA-Server, both the main and sub. For example, if you are duplexing a system that requires 10 client licenses, you will need to insert a license key for 10 or more client licenses into each of the main and sub PCs that run FA-Server.