First, sorry because bad english.
I want to measure temperatures with arduino and send the values to plc CQM1H-CPU51.
I founded the MODBUS RTU Slave Interface for CQM1-CPU4x/CQM1H CPU51/61 PLC in download section.
I am uploaded the program with dm memory.
For now i want to communicate between pc and plc to try the program, but for now no respons from plc.
I try to communicate with modbus softwares (CAS modbus scanner, Symple Modbus Master, qModMaster), but idon't have respons from plc.
Just lit one a communication led and thats it.
If someone have a functioning example for this type of communication between arduino and CQM1H please answer here.
Or someone use this Modbus rtu ladder program tell me how use it.