Modbus – General Information

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The Modbus over TCP protocol is used for the communication with PLCs from Wago, Groupe Schneider, Beckhoff and all CPs capable of using the Modbus over TCP protocol (Modicon, Ethernet terminals from Phoenix, Wago, Beckhoff and many more).

The Modbus protocol only works in conjunction with TCP/IP.

Read (Fetch active) and Write (Write active):

•When communicating with Modbus PLCs, it is generally possible to both read and write data over a single connection.
•If default port 502 is used, you only need to parameterize the connection on the device side. On the PLC side, no other settings are required.

 

NOTE:

For the communication via Modbus over TCP, a specific Modbus Item Syntax is used.

 

See also Modbus Symbol Import.