6. BASIC INSTRUCTIONS
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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 before END or FEND of the main and subsequence programs.
Timing chart
OFF M0 is not switched on.
ON
M0 is only switched on during the first scan of the subsequence program selected by the CHG instruction
executed after X0 is switched on.
Operation
X0
status
OFF
↓
ON
M0 is only switched on during 1 scan.
X000
PLS M0
Input condition
Main sequence
program run
Subsequence
program run
X0
M0
CHG instruction execution
CHG instruction execution
1 scan
0
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