There are quite a few open source libraries to communicate using Modbus. You might look into pymodbus or jamod, depending on your programming language preference.
Hello guys. I am trying too establish a secure connection between my Schneider plc and my raspberry pi. What i want is my pi to read the values from plc and then transmit those values to cloud. Any idea how this can be done?
Node-RED would work for that as boneless said. Make your PLC a Modbus TCP slave, RPi will poll it and send to cloud in whatever shape or form you want.