Timer function
91
Astable:
By indicating a switch-on and off time, a pulse generator is created without a trigger input. If
the pulse-duty factor is also used for controls, it changes the switch-on time. The setting switch-off
time = 0 is a special case: The switch-on time then corresponds to the entire period, and the pulse-
duty factor to the relationship between the switch-on and the switch-off time
Example
: A duty factor of 30% results in 30% ON and 70% OFF for the entered switch-on time.
Impulse:
If the selected trigger slope occurs, the output for the timer time switches on. A trigger input
status change during the impulse time does not change the output status.
The trigger slope is positive if the input status changes from "OFF" to "ON" or from "switch open" to
"switch closed" (= closing). A change from closed to open (= opening) is a negative trigger slope.
TRIGGER SLOPE =
pos/neg
starts the timer anytime there is a status change at the input.
The properties of
retriggering
based on the example of a positive trigger slope:
