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Chapter 5 Power Supply / CPU
5-9
5.3.5 Timer Processing
The MASTER-K series use up count timer. There are 5 timer instructions such as on-delay (TON), off-delay (TOFF), integral
(TMR), monostable (TMON), and re-triggerable (TRTG) timer.
The measuring range of 100msec timer is 0.1 ~ 6553.5 seconds, 10msec timer is 0.01 ~ 655.35 seconds, and that of 1msec
timer is 0.001 ~ 65.53 seconds. Please refer to the ‘MASTER-K programming manual’ for details.
1) On delay timer
The current value of timer starts to increase from 0 when the input condition of TON instruction turns on. When the
current value reaches the preset value, the timer output relay turns on.
When the timer input condition is turned off, the current value becomes 0 and the timer output relay is turned off.
2) Off delay timer
The current value of timer set as preset value and the timer output relay is turned on when the input condition of TOFF
instruction turns on. When the input condition is turned off, the current value starts to decrease. The timer output relay is
turned off when the current value reaches 0.
Preset value
Timer output relay
Timer type
input condition
Output relay
Pre value
Current value
Timer in
p
ut condition
Timer out
p
ut rela
y
Preset value
Current value
t1
PT
PT
t3
t5
t5 + PT t1 + PT
t0+PT
t0
t5 t4+PT
t0 t1
t2 t3 t4 t5
t1 t2 t3
t4
t5
t0
t2 t4