Mitsubishi PLC's Parameter Settings for Modbus Communication

The MOV instruction is also used to save the hexadecimal representation of the Baud Rate, Data Bits, Parity, Stop Bit, and Comm. Protocol parameters in the D8120 register, which is stored in Hexadecimal Number. The binary format 0100 0000 1000 0001 is equivalent to the Hexadecimal number , where each bit denotes a distinct communication configuration.

So, how do we use it? For example, let's assume that our desired communication setting is :

Data Length         : 7 bit 

Parity                    : None

Stop Bit                : 1 bit

Baud Rate            : 9600 bps

Comm. Protocol  : Modbus Slave

Slave ID               : 1

Therefore, Our Binary Code will be 0100 0000 1000 0001. Remember! This Binary Code B0 to B15 is from Least Significant Bit to Most Significant Bit. If you still confuse about that you can see a figure that what I uploaded. After getting that Binary code, you need to convert from Binary Code to Hexadecimal Value. That will be H4081. After that it will be stored in D8120 Register. Slave ID 1 will be stored in D8121.

Reference : Instrumentationtools

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