Chapter 5 Power Supply / CPU

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.

Preset value

Timer output relay

Timer type

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.

input condition

 

 

 

 

 

t0

t1

t2

t3

t4

t5

Output relay

 

 

 

 

 

 

t0+PT

 

 

t4+PT

t5

Pre value

 

 

 

 

 

Current value

 

 

 

 

 

t0

t1

t2

t3

t4

t5

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.

Timer input condition

 

t2

t3

t4

t5

t0

t1

Timer output relay

 

t1 + PT

 

 

t5 + PT

 

 

 

 

Preset value

 

PT

 

 

PT

 

 

 

 

 

Current value

 

 

 

 

 

 

 

5-9

 

 

 

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LG Electronics 120S user manual Power Supply / CPU Timer Processing, On delay timer, Off delay timer