5.7.3 Delayed make and break
Sometimes you will want to switch an output on after a delay and then switch it off again after
another delay. This is very easy to implement with the controller’s basic logical instructions.
When X0 is switched on T1 is started and T2 reset. At the end of the delay period t1 the output
Y10 is switched on. It keeps on as long as X0 is on.
But even when X0 is switched off und T1 is reset Y10 remains on because of the latching func
-
tion. When X1 is switched off timer T2 is started. After the delay period t2 the output Y10 is
reset.
MELSEC System Q Beginners Manual 5 – 19
Devices in Detail Programming Tips for Timers and Counters
T2
T1
Y10
X0
t1
t
OFF
ON
OFF
ON
0
1
0
1
t2
Signal sequence
Ladder Diagram
MELSEC Instruction List
LD X0
OUT T1
K25
LDI X0
OUT T2
K50
LD T1
OR Y10
ANI T2
OUT Y10
IEC
Instruction List
LD X0
TIMER_M TC1, 25
LDN X0
TIMER_M TC2, 50
LD TS1
OR Y10
ANDN TS2
ST Y10
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