I am connection my RPi 2 and an PLC. RPi 2 is the Master and the PLC as the Slave and I have my setup correct, but I have a hard time understanding how to make a channel when I need to read ex. Digital output in the PLC. The PLC ouput is from 00001 and is handled by the funktions code 1 and read some register 34029 Modbus offset 4000. Can anyone help me to understand how to make a channel setup.

//Peter

Hi Peter,
a starting point could be attached example..

BR
Edwin

ControlWinModbusMasterSlaveCommunication.project [76.97 KiB] (forum.codesys.com)

Hi Edwin,
Thank you for your feedback, but still I am not able to have it work as expected.

I have attached my project and some PLC Modbus Document and I also add some commend:

1. My Raspberry Pi is licenced, and I use the newest package 3.5.9.10
2. I have not licenced the Modbus TCP Master.
3. I want to read i the PLC node ID on Register SR29 = 34029 (Value=20)
4. I want to read a timer in the PLC on register R30 = 43030 (Value between=0-7000)
5. I want to read the timer setpoint in the PLC on register R33 = 43033 (Value=7000)

I have tryed to setup the modbus TCP Slave with channels, but not able to see any values

Please let me have you feedback.

Best Regards
Peter Grote

Edwin Schwellinger hat geschrieben:
Hi Peter,
a starting point could be attached example..
BR
Edwin

project001_20160728_ModbusTCP.project [346.86 KiB] (forum.codesys.com)