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KFU 2-/4-
178
14.5.1.1 Timer – Time Constant
The logic sequence of input and output signals is to be set separately for both timer
functions via the time constants. The default parameter values result in a direct link of
the input and output signal without a delay.
Note:
Before starting the timer, select the operation mode and set the time
constants in order to avoid non-defined states.
Select operation mode for:
Set time constants in:
Operation Mode Timer 1
790
Time 1 Timer 1
791
(signal delay)
Time 2 Timer 1
792
(signal duration)
Operation Mode Timer 2
793
Time 1 Timer 2
794
(signal delay)
Time 2 Timer 2
795
(signal duration)
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
791 Time 1 Timer 1, signal delay 0.00
s/m/h
650.00
s/m/h 0.00
s/m/h
792 Time 2 Timer 1, signal duration 0.00
s/m/h
650.00
s/m/h 0.00
s/m/h
794 Time 1 Timer 2, signal delay 0.00
s/m/h
650.00
s/m/h 0.00
s/m/h
795 Time 2 Timer 2, signal duration 0.00
s/m/h
650.00
s/m/h 0.00
s/m/h
Examples of the timer function depending on the selected operation mode and the in-
put signal:
Normal, positive edge
Parameter
Operation Mode Timer 1
790
or
Operation Mode Timer 2
793 = 1
Input
Output
Time 2
Time 1
Factory setting (Time 2 = 0)
As soon as the positive signal edge is received at the input, time 1 (signal delay)
starts. After the expiry of time 1 (signal delay), the output signal is switched on for
time 2 (signal duration).
In the settings of signal duration (
Time 2 Timer 1
792
= 0
and
Time 2 Timer 2
795
=
0) the timer does not reset the ouput signal.
Retrigger, positive edge
Parameter
Operation Mode Timer 1
790
or
Operation Mode Timer 2
793
= 2
Input
Output
Time 2
Time 1
Time 1
Facory setting (Time 2 = 0)
As soon as the positive signal edge is received at the input, time 1 (signal delay) is
started. If a positive signal edge is detected within time 1(signal delay), time 1 starts
again. After the expiry of time 1 (signal delay), the output signal is switched on for
time 2 (signal duration).
In the settings of signal duration (
Time 2 Timer 1
792
= 0
and
Time 2 Timer 2
795
=
0) the timer does not reset the ouput signal.
: Time not run out completely
: Time run out completely