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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.12.4 Sequence program readlwrite
(1)
Commands and step allocation
(a) ACPU common commands
1
Command
1
1
1
PC CPU State
-
--
. -
-
-
-
-
Note
:
o
...........
Executa
During RUN
SW04
SW04
ON
OFF
0
0
0
0
o *
X
0
X
o *
X
0
X
x
...........
Not executable
tccess
to
.iSCPU
0
X
0
X
*
Writing during a program run may be executed if all the following
conditions are met:
1) The PC CPU is A3, A3N, A3H, A3M, A73, or A3A.
2) The program is not the currently running program (indicates a
a
subprogram called by the main program, if the main program is
being run).
Acces
to PC
CPU i
Data
Link
0
0
0
0
3) The PC CPU special relay is
in
the following state:
i) M9050 (signal flow conversion contact)
.....
OFF
(A3CPU only)
...............
ii) M9051 (CHG instruction disable)
ON
POINT(
When reading or writing the timerlcounter setting values using the se-
quence program readlwrite command, range designations of TO t o T255
or CO to C255 are possible.
Extended ranges of T256 to T2047 and C256 to C1023 for AnA CPU
should be used for storing the setting values; read or write the set values
using the batch readlwrite command for devices (D, W, R) allocated by
parameter setting.
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