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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.1 2.4
Sequence program readlwrite
Batch
Batch
write
i
(1) Commands and step allocation
(a) ACPU common commands
Number
of
PC CPU State
Points
Processing
During RUN
Item
eads main sequence
pro-
Note
:
o
...........
Executable
x
...........
Not executable
*
Writing during a program run may executed out if all the follow-
ing 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
subprogram called by the main program, if the main program is
being run).
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
9
When reading or writing the timerlcounter setting values using the se-
quence program readlwrite command, range designations of T O to T255
or C O to C255 are possible.
Extended ranges of T256 to T2047 and C256 to TI023 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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