Mitsubishi MELSEC LJ71C24, User Manual

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8 DATA COMMUNICATION USING THE MC PROTOCOL
8 DATA COMMUNICATION USING THE MC PROTOCOL
MC protocol is a communication method for the Mitsubishi programmable controller.
Using this protocol, the external devices can read or write device data and programs
from or to the CPU module.
The C24 automatically returns a response message based on requests from external
devices. Thus, sequence programs are not required for response messages.
For details of the MC protocol, refer to the MELSEC-Q/L MELSEC Communication
Protocol Reference Manual.
ENQ Command Characters
Sam
check
code
ETX STX Characters
Sam
check
code
(1) CPU module device memory read/write
This function reads and writes data from/to the access target CPU module device
memory and intelligent function module buffer memory.
For the accessible range, refer to the MELSEC-Q/L MELSEC Communication
Protocol Reference Manual.
(2) Sequence programs and parameters read/write
This function reads and writes program files and parameter files stored in the
CPU module.
(3) Remote control of the CPU module
This function performs remote RUN/STOP/PAUSE/latch clear/reset operations.
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