Trouble with our easy E4 and Modbus over TCP/IP

[onygaard]

Hi,

We are struggling with our easy E4 and Modbus over TCP/IP.

The PC has easySoft v7.11 installed, and the easy E4-PLC is updated to firmware v1.12, and the Modbus server is activated and I/O are readable.

We have set static IP-adresses on the PC and the PLC, and the PC can ping the PLC.

The PCs firewall i temporarely shut down, but we can't contact the Modbus server from a test application like Radzio! Modbus Master Simulator or CAS Modbus Scanner.

Have we missed something?
What is the preferred test application?

Best regards,
Tryggheim skular
Ole Harald Nygaard

[radar17892]

Hi Ole,

at first, activate in your projekt tab the Modbus server and needed flag words / IO.

Please read chapter 11.4.4 Modbus-Map for the mapping offset.
For example, you read with Function 0x03(ReadHoldingRegister) MW200-207 from E4, then is the offset 1200 and length 8.

My test application is an codesys 3.5 MBTCP-Master on XV102 PLC and it's run.

regards Thomas