[V570 acting as both Master and Slave]

Thanks for your advice Flex727. I break code in simpler rungs and check every socket parameter and it works! I'm reading holding register from my software through TCP/IP Modbus.

Best regards!

Juan

[V570 acting as both Master and Slave]

Hi, I'm trying to do almost same thing, but only one PLC (Vision 1210). It is Master when comunicating with a rpm driver trough serial. And it is Slave when I try to communicate from software in my laptop trough ethernet (software creates a master instance). PLC works perfect when controlling rpm driver. From laptop to PLC the connection is established (I open a tcp/ip connection using IP and port 502 of PLC and it says "OK" without errors), but when try of read holding registers nothing happens.

I know there are two sources of error: 1) software is not asking properly for the registers. 2) PLC setting are wrong.

I ask you to give a look in my PLC configuration and tell me if you see any problem.

Thank you in advance.

Juan

Extra info: PLC Vision 1210, software is LabView. Visilogic version 9.8.64. Win 7 32-bit