APPENDICES
--------------------
MELSEC-A
4.4 A6PU/A7PU
The system disk of current version is used
for
use with
the
A2C.
(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 X/yO to XIY1FF.
(4) Interrupt programs and interrupt counters are unusable.
On
the
A2C, interrupt programs (I to
IREn
cannot be executed.
(5) Unusable devices
Since the A2C does not execute interrupt programs, I (interrupt pointer)
is not usable.
Do
not
set interrupt counters using parameters. Counters set
for
inter-
rupt 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) EI/DI (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 A6PU/A7PU can be connected to
the
A2C only by
the
hand held
system. (The add-on system cannot be used.)
APP-26
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