Control Protocol Format 4 - Mitsubishi Electric MELSEC FX Series User Manual

FX communication
7.4.2

Control Protocol Format 4

Description
Transmission sequence
To read data
Computer
from the PLC
to the
Programmable
computer controller
Computer
To write data
Programmable
from the
controller
computer to
the PLC
1 ) Sum check code is used when the sum check flag is set "Yes" ("b13=1" in special data register
D8120), and not used when set to "No" ("b13=0").
2 ) When the sum check flag is set to "Yes", the sum check is made on the characters in the
Remarks asterisked area.
3 ) In the diagram, the contents of character area A, character area B, and character area C
depend on the individual system, but do not differ depending on the format of control protocol.
For details of each character area, see the link contents.
Control protocol
*
*
Transmission sequence
or
*
or
Computer link 7
or
7-7
7