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eWON wiki > eWON Support > PLC Connectivity > Modbus

Modbus

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The MODBUS IO Server is the standard remote IO communication.
It is used to configure:

  • The eWON as a Modbus RTU master.
  • The eWON as a Modbus TCP slave and master.

The eWON MODBUS IO server will give access to values in equipments having a MODBUS interface.
The interface can be:

  • RS485 – MODBUS RTU protocol will be used
  • ETHERNET/PPP – MODBUS TCP protocol will be used.

The eWON can mix access to MODBUS RTU and MODBUS TCP, depending on the way the Tag address is defined.

 Modbus_family.jpg
Documentations
IOServer Modbus (extract from RG-001) Modbus.pdf
Simple Modbus network should be setup easily.
This document provides more in-depth information about eWON Modbus operation to help you debug more tricky situations.
This Technical Note describes some internal mechanisms in the eWON Modbus engine, and gives you some hints to debug the communication problems.		 Understand and use eWON ModbusRTU
Modbus application protocol specification (v1.1a) Modbus Spec.pdf
Modbus Installation Checklist TN10.pdf
MbsTcpCOM: virtual Modbus RTU through TCP/IP TN11.pdf

 

Softwares
eVCOM: eWON Virtual Com Port eVCOM_setup  1.3.1.34
releases notes