MX2N series HMI PLC all in one programming manual
29
*
2
：
D8121 is MODBUS-RTU slave station number setting
*
3
：
When the data bit is in 7 bit,the parity can’t be selected---No checking. (6038 failure).
*Mitsubishi Programming port protocol
：
Data length is 7
，
stop bit is 1
，
Parity EVEN is fixed
，
the rate can be set
；
*MODBUS-RTU protocol
：
data length, stop bit, parity, rate can be set;
*RS instruction
：
Data length, stop bit, parity, rate, start character, and end character can all be
set.
9.4Modbus-RTU Master station instructions
Master read slave data usage instruction
* Transfer the data of register from address 0 of 1
st
station to D0
M1
--low 8 bits indicate the slave address, high 8 bits indicate the sent instruction;
Such as: H301-command 03 (read register instruction), slave address 01; if the high 8 bit is 0,
then the command is default as 03;
M2
--slave element address; (Slave address of MX2N series PLC refers to slave element
address table);
D
- master station data register, this register holds the data which read from the slave station;
N
-- read data length (1~64);
Master write slave data usage instruction
* Write the data of D0 to the register with the 1
st
slave in address 0
M1
--The lower 8 bits indicate the slave address ,the high 8 bits indicate the sent instruction;
Such as: H601-command 06 (read register instruction), slave address 01; if the high 8 bit is 0,
the command defaults is 06;
M2
--slave component address; (Slave address of MX2N series PLC refers to slave element
address table);
If the address is set to 0, it means that data is written to all slaves;
D
-- the master station data register, which holds the data to be written to the slave;
N
-- write data length;
When using commands 05 (write bit) and 06 (write register),act as 1 regardless of the
length is set.
When using H10 (K16) to write multi-bit registers, the data length
(1~64)
;
Special Note:
1. FROM and TO can be used many times in the program. When multiple instructions
