XMC Modbus TCP Server Setup

The XMC has Modbus TCP capability with the built in ethernet port.

  • Modbus TCP uses port number 502.

  • The XMC can be a Modbus server.

  • There are a maximum of 8 Channels to be used by the Modbus TCP Server.

  • Up to 512 bytes of data.

This is a dedicated function.

AREA Device Type Size (Word) Remark
I %IW0.0.0 to %IW15.15.3 1024 Read, Write Enable
Q %QW0.0.0 t %QW15.15.3 1024 Read, Write Enable
M %MW0 to %MW16383 16384 Read, Write Enable
W %WW0 to %WW32767 32768 Read, Write Enable
Function Codes Function Modbus Transcription
Function Code 01 (h01) Reading output bit Read coils
Function Code 02 (h02) Reading input bit Read discrete inputs
Function Code 03 (h03) Reading output word Reading holding registers
Function Code 04 (h04) Reading input word Write input register
Function Code 05 (h05) Writing output bit Write single coil
Function Code 06 (h06) Writing output word Write single register
Function Code 15 (h0F) Writing output bit sequentially Write multiple coils
Function Code 16 (h10) Writing output word sequentially Write multiple registers
Step Action
1

Open the Local Ethernet Parameter settings.
2

Setup FEnet parameters.
3

Choose Modbus Server or Smart Server as the Server Mode.
4

Press Modbus Settings button to configure memory address space for the server.
5

Configure Modbus Settings with appropriate memory addresses.

Example mapping:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LM203