Mitsubishi A Series - 8. COMMUNICATIONS USING DEDICATED PROTOCOLS; 8.1 Data Flow in Communications with Dedicated Protocols

I.
8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8. COMMUNICATIONS USING DEDICATED PROTOCOLS
This chapter explains the details and methods of specifying control
protocols
1 to 4 along with examples.
8.1 Data Flow in Communications with Dedicated Protocols
(1) The computer reads data from the PC CPU
-RUM
PCCPU AI71 c24
Command
(3) R..d muat
(7) varbus dah
(10) RIponW
- - - - - J
0 Device memory informa-
tion
information
(0) (8)
R.d (4) 0) D.tr
0 Extenrion file register
r-'--- 1
I av-::moq, I
0 Sequence program
0 Microcomputer program
0 Comment
0 Parameter
munidons
L-----J
~
PC CPU information
(2) The computer sends data to the PC CPU
I I I
.,
I
121 Commands. dm. etc.
e Device memory information
Extension file register infor-
Sequence program
0 Microcomputer program
Commont
0 Paramoter
0 PC CPU information
mation
muniutiom
(3) The PC CPU sends data to the computer
Computer
AJ71C24
(5) Data
On-demand data
The OS (operating system) shown in the above illustrations is the software that uses resources
such as the PC CPU, memory, terminals, files, and network efficiently.
In this manual, this software is described as the system program or system.
8-1
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