User`s manual

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