Computer Link; Data Flow By Link - Mitsubishi Electric MELSEC FX Series User Manual

FX communication

7. Computer Link

This chapter explains the details and methods of specifying dedicated protocol used for linking of
the FX programmable controller and computer. The dedicated protocol is available in two types,
format 1and format 4 (the format names conform to the dedicated protocols used in the computer
link unit of the A series programmable controller).
In this chapter FX
FX -485-BD, FX
2N
to 485PC-IF.
When interface of programmable controller using RS-232C, please after read 232ADP instead of
485ADP .
7.1

Data Flow by Link

Shown below are drawings of data flow for reading, writing, and status control of the
programmable controller.
1 ) The computer reads data from programmable controller.
Computer
OS*
(11)
(10)
Data
(1)
Comn.
Prog.
2 ) The computer sends data to programmable controller.
Computer
OS*
Data
(1)
Comn.
Prog.
*OS (operating system) is the software for operating (or using) effectively the resources such as
the CPU, memory, terminal, file and network.
-232-BD, FX -232-BD, FX
2N 1N
-485-BD, FX -485ADP and FX-485ADP refer to 485ADP , FX-485PC-IF refer
1N 0N
RS-232C
485PC-IF
(2)Command
(9)Various data
(12)Response
%
Device memory
information (Read)
Signal
%
Programmable
converting
controller CPU
interface
information (Read)
RS-232C 485PC-IF RS-485
(2)
Command,
data,etc.
(8)
Response
%
Device memory
information (Write)
%
Programmable
controller CPU
information (Write)
-232ADP and FX-232ADP refer to 232ADP,
0N
485ADP
RS-485
(3) (4)
(8)
(7)
(14)
(13)
485ADP
(3)
(4)
(7)
(6)
Computer link 7
Programmable controller
OS* Program
Data(6) (5)Read
Device
memory,etc.
Programmable controller
OS*
Program
(5)
Write
Device
memory,etc.
7-1
7