There are four different types of Modbus drivers (and five network types). Three networks are client types, where the station acts as a Modbus master device. The other two networks are slave or server types, where the station exposes data as a Modbus server, and simply responds to Modbus queries.
All Modbus networks use the standard NiagaraAX network architecture. See “About Network architecture” in the Drivers Guide for more details. These are the different Modbus network types:
Client types:
Modbus Async — see About Modbus Async networks.
Modbus Tcp — see About Modbus TCP networks.
Modbus Tcp Gateway — see About Modbus TCP Gateway networks.
Server types:
Modbus Slave — see About Modbus Slave networks.
Modbus Tcp Slave — see About Modbus TCP Slave networks.
Under the various Modbus networks, child Modbus device components and their children (proxy points and other components) are similar and sometimes identical—especially among the client types, and also among server types. Therefore, Modbus component information is arranged into two main sections:
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