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4.
LINKING TO THE AnACPU (WITH DEDICATED INSTRUCTIONS)
AND THE AJ71 PT32-S3
MELSEC-A
4.7.2
Precautions when programming
(1)
It is necessary to provide the PRC instruction to the step immediately
following the FROM/TO instruction. Do not use the same 'ml" device
for different steps.
I
LEDR
I
1
L E D R k -
Do not designate
the same device
number.
(2) The request-to-communicate registration areas can store a maximum of
32 FROMRO instructions. If the 33rd FROM/TO instruction is executed,
an operation error occurs.
Provide an interlock with the M9081 and D9081
so that the FROM/TO
instruction cannot be executed when the request-to-communicate
registration areas are full.
M9081 and D9081 are explained below.
I
Number
I
Contents
I
Details
OFF
: The request-to-communicate
ON : The request~to~communicate
remote terminals. Goes
ON when all areas are full.
M9081
registration area has
a
vacancy.
registration areas are full.
There are 32 request-to-communicate registration areas for
I
D9081
1
The number of vacant areas in the
request~to~communicate registration
area for remote terminals.
The number
of vacant areas in the request-to-communicate
registration area is stored.
4 - 2 8
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