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APPENDICES
/MELSEC-A
4.4
A6PWA7PU
The system disk of current version is used for use with the A2C.
(1
1
CPU type
When the A6PU/A7PU is connected, the CPU type is set as
"A2".
(2) Program capacity
The A2C has
8K
steps of capacity for sequence programs and
microcomputer programs.
By
parameter setting, program capacity less than
8K
steps
should be set.
(3)
Number of
I/O
points
The A2C has 512 input and output points from
WYO
to
X/Y1
FF.
(4)
Interrupt programs and interrupt counters are unusable.
On the A2C, interrupt programs
(I
to IRET) cannot be executed.
(5)
Unusable devices
Since the A2C does not execute interrupt programs,
I
(inter-
rupt pointer) is not usable.
Do
not set interrupt counters using parameters. Counters set
for interrupt counters cannot execute count processing with
main routine programs and subroutine programs.
(6) Unusable instructions
The following instructions are not usable on the A2C.
(a)
PR
(ASCII print instruction)
(b)
EVDI
(Interrupt program allow/disallow)
(c) IRET (Interrupt program return)
(7) Remote terminal setting
Remote terminal setting of the A2C is executed with the initial
program of the sequence program. (See Section 4.2.9 for
details of the initial program.)
(8)
Connection to the A2C
The AGPUIA7PU can be connected to the A2C only by
the
hand
held system. (The add-on system cannot be used.)
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