Hi everybody,

I have problem with Modbus RTU communication. Error No. 8180 is appearing in block MB_COMM_LOAD at startup and then in MB_MASTER block. According to me, the MB_COMM_LOAD block doesn't finish at all.

I'm using 1212C with communication module CB1241. 

I have read many posts but I have not been able to solve the problem.

My target is Modbus communication between PLC(master) and four arduinos (slaves). I'm using ArduinoModbus library and it works correctly. I would like start blink the LED on one arduino when i push the button at input I0.0 in PLC.

Can you help me, please? Does anyone see, where can be a problem? I attached prints to the pdf.

Thank you very much.

BR

Jenda

Hi _Jenda_!

It seems that error 8180 in Comm_Load is not categorised. However, this code is available in the Master function.

Hi Swarley,

Thank you for your answer. I found a reason of error..

I tried to download hardware changes separately from complete compilation and download.. Then it works well.

Double-click to Device configuration / right click to PLC device/ Download to device/ Hardware configuration  Thats all.

Awsome!!! It worked. Thank you!!