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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.1 2.5
Microcomputer program readlwrite
(1)
Commands and addresses
Commands and program addresses to read'and write microcomputer
programs are explained below:
(a) ACPU common commands
Processing
Note
:
o
........
Executable
x
........
Not executable
*
Writing during a program run may be executed if all the
following conditions are met:
1 )
he PC CPU is A3, A3N, A3H, A3M or A73
2)
The program is not currently running program (indicates a sub-
program called by the main program, if the main program is
being run).
3) The PC CPU special relay is in the following state:
M9050 signal flow conversion contact : OFF (A3CPU only)
M9051 (CHG instruction disable)
: ON
(b) Microcomputer program address
Microcomputer addresses are designated in the protocol as fol-
lows:
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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