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Modbus-I/O-Server

Hello everyone,

i´ve connected a Siemens S7-1500 to LabVIEW via Modbus and it worked. However the program has still an error. In fact after restarting the PLC the connection to LabVIEW is lost. Also the connection gets lost after an undefined time.

At first I thought it is on a blocked Port (502) but I can exclude this because i checked it with a Software-tool (CurrPorts).

Even after the computer or the PLC is restarted the problem persists.

When I create a new Modbus I/O Server in a new project and bound variables sometimes the problem is resolved. Then i have to copy that bound variables and paste it into the main project. This method works until the connection gets lost again

 

I'm grateful for any advice

 

Greetings

J.W.

 

 

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