DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-39
Chapter 5: Standard RLL Instructions
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A
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Timer, Counter and Shift Register Instructions
Using Timers
Timers are used to time an event for a desired period. The single input timer will time as long
as the input is on. When the input changes from on to off, the timer current value is reset to 0.
There is a tenth of a second and a hundredth of a second timer available with a maximum time
of 999.9 and 99.99 seconds respectively. There is a discrete bit associated with each timer to
indicate that the current value is equal to or greater than the preset value. The timing diagram
below shows the relationship between the timer input, associated discrete bit, current value and
timer preset.
There are those applications that need an accumulating timer, meaning it has the ability to
time, stop, and then resume from where it previously stopped. The accumulating timer works
similarly to the regular timer, but two inputs are required. The enable input starts and stops
the timer. When the timer stops, the elapsed time is maintained. When the timer starts again,
the timing continues from the elapsed time. When the reset input is turned on, the elapsed
time is cleared and the timer will start at 0 when it is restarted. There is a tenth of a second and
a hundredth of a second timer available with a maximum time of 9999999.9 and 999999.99
seconds respectively. The timing diagram below shows the relationship between the timer
input, timer reset, associated discrete bit, current value and timer preset.
NOTE: Decimal points are not used in these timers, but the decimal point is implied. The preset and
current value for all four timers is in BCD format.
X1
X1
T0
1
2
3
4
5
6
7
8
0
0
10
10
20
30
40
50
0
Current
Value
TMRA
T0
K30
X2
X2
Reset Input
Enable
Seconds
1/10 Seconds
TMR
T1
K30
X1
X1
T1
1
2
3
4
5
6
7
8
0
0
10
20
30
40
50
60
0
Current
Value
T1
Y0
OUT
Seconds
1/10 Seconds
Timer Preset
