Message Formats And Control Procedures - Mitsubishi MELSEC Q Series Reference Manual

6.1 Message Formats and Control Procedures

This section explains the message format and control procedure for each command
when data communication is performed using A compatible 1E frames.
Data communication using A compatible 1E frames is equivalent to the functions for
reading/writing data from/to the programmable controller CPU supported by A series
Ethernet interface modules, and only the commands mentioned in Section 6.2 can be
used.
6.1.1 How to read the command reference section
The following explains how to read the message explanation diagrams shown in each
of the command description Sections 6.3 through 6.5.
(1) When an external device reads data from the programmable
External
device side
Programmable controller CPU side
6 - 2
6 WHEN COMMUNICATING USING THE A COMPATIBLE 1E FRAMES
controller CPU
(Command message)
1) Area A indicates transmission from the external device to the
programmable controller CPU.
2) Area B indicates transmission from the programmable controller CPU to
the external device.
3) The program of the external device is generated so that the data is
transmitted sequentially from left to right. (For example: in case of
area A, data should be sequentially sent from Header to the right.)
Area A
(Response message)
Area B
6 - 2
6