Hi everybody,

I need some help in configuring MODBUS tcp/ip in CitectSCADA 7.20. I am trying to read integer values from Modbus Slave simulator (FC-3). I have created Variable Tags in Citect system with addresses 40001 and 40002. I monitor The modbus transactions on Wireshark. When the project is compiled and run, I get valid replies from the Slave without any exceptions. The Tx AND Rx queries confirm that. However I am having a difficult time displaying it on the screen. The screen in spite of correct replies from the slave shows #COM.

Any Suggestions on what can be wrong with the configuration? The slave simulator that I use is Modbus Slave v 4.6.1 Build 641 from http://www.modbustools.com/

Kindly help

Regards
Gaurav Tyagi

 

Hello Guarav,

you have to create a Modbus Device first, and type in the right IP-Adress with the port 502.
Use the Express Assistant under Project editor to do this.

Regards,
K. A.