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App. - 9
Appendix 4.3 Long-time timer
(1) Necessary time is obtained by connecting timers in serial.
T9
X2
T9
0
5
3000.0sec.
2000.0sec.
Turns on after
time limit elapses
K30000
T10
K20000
Y72
T10
11
Normally open
contact T9
X2
Normally open
contact T10
Y72
2000sec.
3000sec.
5000sec.
(2) Necessary time is obtained by using timers and counters.
Time limit of timer Set value of counter = Long-time timer (note that accuracy
of timers are accumulated.)
Project name QA-18
Program name MAIN
T14
X2
X2
C7RST
0
7
Turns on after
time limit elapses
K9000
Y73
C7
K4
M56
M56
C7
Y73
Y73
T14
12
C7
18
900sec. × 4 = 3600sec. = 1 hour
Coil T14
X2
Normally open
contact T14 (M56)
C7
Y73
One scan
(Note) Sufficient time is obtained with the counter C7 which counts the number of
time-outs of the timer T14.
M56 resets T14 after time-out. With C7, the output Y73 is self-energized
while count up is in progress. With Y73, T14 is reset and the following time
count is stopped.