ModBusSlave Library for the AC800M
Hello, dear collègue.
I work for ABB France, and I have the next problem:
I have to replace an AC70 which communicate with a T-Box LT100 via Modbus, I will have to use an AC856.
I have already bought the Slave License with the
I have made some test with an AC800 on the Port Com 3 and several simulators, and every time I can only write Boolean or integer but I am never be able to read anything in the controller.
It seem also that the controller don’t send any answer to the Master.
To be able to read something from the Master, I have to use MBGetCoil or MBGetRegister, the MBGetCoils or MBGetRegisters don’t work well.
Please could you help me on this project?
The system SW must be version 6.0 for Modbus slave support.
New in SV6.0 Support for MODBUS RTU Slave
The AC 800M controller can now act as a point-to-point MODBUS RTU slave. The
communication takes place via COM3 on the CPU, or via any serial channel on
CI853. The same set of Function Codes as with CI867 slave is supported.
If you use SW version 5.1 or older only Modbus Master is supported.