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FX
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Series Programmable Controllers
3G
3U
3UC
Programming Manual - Basic & Applied Instruction Edition
4.5.5
Details of timer operation and timer accuracy
A timer (except interrupt execution type) starts counting when a coil is driven, and its output contact turns on
when the first coil instruction is executed after the timer has reached timeout.
X010
T 0
As shown in the above operation diagram, the accuracy of operation of the timer contact after the coil is
driven until the contact turns on is shown in the following outline:
T
α : 0.001 sec (timer for 1 ms), 0.01 sec (timer for 10 ms) or 0.1 sec (timer for 100 ms)
+T
0
−α
T : Timer set value (sec)
T
: Operation cycle (sec)
0
If the contact is programmed before the timer coil, "+2T
When the timer set value is "0", the output contact turns on when a coil instruction is executed in the next
cycle. An interrupt execution type timer for 1 ms pulses counts clock pulses of 1 ms as an interrupt
processing after a coil instruction has been executed.
4.5.6
Program examples [off-delay timer and flicker timer]
Off-delay timer
X001
T 5
Y000
Flicker timer (blink)
X001
T 2
T 1
In addition, the flicker operation can be performed by the ALT (FNC 66) instruction.
Multi-timer by the applied instruction STMR (FNC 65) <FX
By this instruction, off-delay timers, one-shot timers and flicker timers can be easily created.
100
Counting operation (If the operation cycle is long,
it automatically counts two or more clocks.)
Input processing X010 = OFF→ON
Timer starts counting
T 0
K12
Y010
1st cycle
Y000
X001
T 5
K200
K20
T 1
T 2
K10
Y000
1.2 sec
time-
out
2nd cycle
"n"th cycle
" is obtained in the worst case.
0
X001
T5
Y000
X001
2
1
2
sec
sec
sec
T1
T2
T1
Y000
T 2
One
operation
(
)
cycle
3U
4 Devices in Detail
Contact is not
activated at this point
T 0
Contact is
activated
Y010
ON
"n+1"th cycle
(20 sec)
/FX
PLC>
3UC
→ For details, refer to Section 14.6.
4.5 Timer [T]
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