CX3G/FX3GC PLC Programming manual
www.coolmayplc.com
For CoolMay PLC, the WR3A instruction corresponds to Modbus's 06 and 10
functions.
In the instruction,
m1 represents the station number of the slave device to be written, range :1-247.
m2 represents the first address number of the write register in the slave device;
S represents the numbers of registers to be written, ranging:1-32. The data to be
written is sequentially stored in the host S.+1, S.+2.
S=1, the WR3A instruction corresponds to the Modbus 06 function.
S=2-32, the WR3A instruction corresponds to the Modbus 10 function.
S.-1 address value must be set to 0. (=0: serial port 2; =1: serial port 3; =2: CAN)