6. BASIC INSTRUCTIONS
6
−
76
MELSEC-A
(3) When the A3H, A3M, A3A, A3U, A4U and Q06H are used, the CHG instruction is
executed repeatedly while its input condition is on.
Ladder example
The following program is written at step 0 of the main and subsequence programs.
Timing chart
OFF
MOVP instruction is not executed.
ON
MOVP instruction is only executed duing the first scan of the subsequence program selected by the CHG
instruction executed after X0 is switched on.
Operation
depending
on X0
ON/OFF
status
OFF
↓
ON
MOVP instruction is only executed once.
CHG instruction execution
1scan
Main sequence
program run
Subsequence
program run
X0
MOVP
CHG instruction execution
X000
MOV 0 D0
P K
Summary of Contents for MELSEC-A series
Page 1: ......
Page 2: ......
Page 13: ...A 11 MEMO...
Page 505: ...APPENDICES APP 100 MELSEC A MEMO...
Page 507: ......
Page 508: ......