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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.12.5 Microcomputer program readlwrite
(1)
Commands and addresses
Commands and Droaram addresses to read and write microcomputer
.
"
programs are explained below:
(a) ACPU common commands
55H, 52H Reads miorocomputer
Batch
main programs.
read
128bybs
56H, 52H Reads miorocomputer
subprograms.
Command
ASCII
Batch
main programs.
write
128 bytes
subprograms.
Number o f
Points
Processed
per Com-
munication
Note
:
o
.......
Executable
x
.......
Not executable
*Writing during a program run may be executed if all the
following conditions are met:
State of PC CPU
1) The PC CPU is A3, A3N, A3H, A3M or A73.
Access
t o
A I
s
CPU
0
X
0
X
During
STOP
0
0
2) The program is not currently running program (indicates a sub-
program called by the main program, if the main program is being
run).
Access
t o PC
CPU i n
Data
Link
0
0
0
0
3) The PC CPU special relay is in the following state:
M9050 (signal flow conversion contact) : OFF (A3CPU only)
M9051 (CHG instruction disable)
:
ON
During RUN
(b) Microcomputer program address
SW04
ON
0
o*
Microcomputer addresses are designated in the protocol as follows:
SW04
OFF
0
X
1) The range of addresses that can be set for each PC CPU is shown
in the table on the next page.
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