Chapter 1 Data Communication Using Mc Protocol; Accessing To Cpu Module Using Mc Protocol - Mitsubishi Electric MELSEC iQ-R Series User Manual

1
DATA COMMUNICATION USING MC
PROTOCOL
MC protocol is a communication method for the programmable controller. Using this protocol, the target devices can read or
write device data and programs from or to the CPU module via a C24.
C24 returns a response message automatically based on requests from the target devices. Thus, programs for response
messages are not required.
For details of the MC protocol, refer to the following manual.
MELSEC Communication Protocol Reference Manual
1.1

Accessing to CPU Module Using MC Protocol

This section explains how to access to a CPU module using MC protocol.
Reading/writing device memory of CPU module
Read/write data from/to the device memory of the access target CPU or intelligent function module buffer memory. For the
accessible range, refer to the following manual.
MELSEC Communication Protocol Reference Manual
Reading/writing programs and parameters
This function reads and writes program files and parameter files stored in the CPU module.
Remote control of CPU module
This function performs remote RUN/STOP/PAUSE/latch clear/reset operations.
Monitoring of CPU module
This function monitors the operation status and data in the device memory of the CPU module.
Transmitting data to a target device from a CPU module
This function requests data transmission from a CPU module to a target device, and transmits on-demand data to the target
device.
1 DATA COMMUNICATION USING MC PROTOCOL
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1.1 Accessing to CPU Module Using MC Protocol
ENQ Command Characters
Sum
check Characters
ETX
code
Sum
check
code
STX