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Appendix 4 Instructions For Use With Peripheral Devices App - Mitsubishi Electric MELSEC-A Series User Manual

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APPENDIX 4 Instructions for Use with Peripheral Devices
This section gives the instructions for use of the A6GPP, A6PHP, A6HGP,
A7PU, and A6WU modules with the A2C.
The system disk for the A2C is SW4GP-GPPA.
If SW3GP-GPPA or other system disks of former versions is used, follow the
instructions described below.
CPU type
On the A6GPP booted with the SW3GP-GPPA disk, set the CPU type as
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
Number of I/O points
The A2C has 512 input and output points from X/yO to X/Y1FF.
Interrupt programs and interrupt counters are unusable.
On the A2C, interrupt programs (I to IRET) cannot be executed. Do not
set interrupt counters using parameters.
Counters set for interrupt
counters cannot execute count processing with main routine programs
and subroutine programs.
Unusable devices
Since the A2C does not execute interrupt programs, I (interrupt pointer)
is not usable.
Unusable instructions
The following instructions are not usable on the A2C.
(a) PR (ASCII print instruction)
(b) EI/DI (Interrupt program enable/disable)
(c) IRET (Interrupt program return)


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