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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.
a
8.1
Data Flow i n Communications with Dedicated Protocols
(1)
The computer reads data from the AlSCPU
.
Parameter
PC CPU information
(2)
The computer sends data to the AlSCPU
AtSCPU
AlSJ71C24
sequence
program
0
(21
Commands,
date.
etc.
.
Device memory information
-
Extension file register infor-
mation
.
Sequence program
-
Microcomputer program
Comment
.
Parameter
.
PC CPU information
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.
(3)
The AlSCPU sends data to the computer
Computer
I n
this manual, this software is described as the system program or system,
AlSCPU
AtSJ71C24
(5) Data
(2) Send request
+
D S I ~
On-demand data
(1)
Send request +
Date
write
request
Special function modul e
r - - - - - i
I
Device memory,
I
~ - - e t s . - - _ l
(8)Read
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