CX3G series PLCs all have a programming port (RS232), two communication ports (RS232 or RS485), and CAN ports are optional to meet users' external connection of several types of equipment.
2. The special relays involved in the serial port are: M8196, M8125, M8122, M8123, M8128, M8029;
2. The special registers involved are: D8120, D8121, D8124, D8125, D8126, D8129.
M8196: Use programming port protocol and other protocol enable flag.
M8125: Use the enable flag of MODBUS and the original Mitsubishi function.
M8128: Communication completion flag (valid for MODBUS communication using RD3A and WR3A, manual reset required).
D8120: Save the Modbus RTU protocol communication parameters, and the highest bit of the communication parameters must be set to E.
D8121: Save the master or slave station number.
When used as Modbus RTU protocol: set M8196=1, M8125=1; D8120 is set as communication parameter;
D8121 sets the slave station number.
Example: (Query the "CoolMay CX3G Series PLC Programming Manual" with the setting method)
Set D8120=HE081, D8121=H1 (communication parameters are 9600/8/n/1, slave station number is 1).
Third, PLC as a host, support ADPRW instruction, RD3A instruction, WR3A instruction.
Fourth, instructions:
[RD3A M1 M2 S] <Instruction Composition Structure>
In the CoolMayPLC, the WR3A instruction corresponds to Modbus No. 06 function and No. 10 function.
In the command: 1.m1 indicates the station number of the read slave device, range 1-247.
2.m2 represents the first address of the read register in the slave device
3.S. Indicates the number of registers to be written, range 1-32. The data to be written is saved in sequence on the host S.+1, S.+2.......
When S=1, the WR3A command corresponds to the Modbus No. 06 function. It means: When writing an address S=1-32, the WR3A command corresponds to the No. 10 function of the Modbus; Indicates: Writing multiple addresses
The case is a master station and two slave stations. The case can be downloaded at the end of the article.
First, port support: RS485 (AB) / RS232 - support Mitsubishi programming port protocol, RS protocol and MODBUS protocol;
2. The special relays involved in the serial port are: M8196, M8125, M8122, M8123, M8128, M8029;
2. The special registers involved are: D8120, D8121, D8124, D8125, D8126, D8129.
M8196: Use programming port protocol and other protocol enable flag.
M8125: Use the enable flag of MODBUS and the original Mitsubishi function.
M8128: Communication completion flag (valid for MODBUS communication using RD3A and WR3A, manual reset required).
D8120: Save the Modbus RTU protocol communication parameters, and the highest bit of the communication parameters must be set to E.
D8121: Save the master or slave station number.
When used as Modbus RTU protocol: set M8196=1, M8125=1; D8120 is set as communication parameter;
D8121 sets the slave station number.
Example: (Query the "CoolMay CX3G Series PLC Programming Manual" with the setting method)
Set D8120=HE081, D8121=H1 (communication parameters are 9600/8/n/1, slave station number is 1).
Third, PLC as a host, support ADPRW instruction, RD3A instruction, WR3A instruction.
Fourth, instructions:
[RD3A M1 M2 S] <Instruction Composition Structure>
In the CoolMayPLC, the WR3A instruction corresponds to Modbus No. 06 function and No. 10 function.
In the command: 1.m1 indicates the station number of the read slave device, range 1-247.
2.m2 represents the first address of the read register in the slave device
3.S. Indicates the number of registers to be written, range 1-32. The data to be written is saved in sequence on the host S.+1, S.+2.......
When S=1, the WR3A command corresponds to the Modbus No. 06 function. It means: When writing an address S=1-32, the WR3A command corresponds to the No. 10 function of the Modbus; Indicates: Writing multiple addresses
The S-1 address value must be set to 0. (=0: serial port 1, =1: serial port 2.)
Case download address
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