Short description
The output is switched on and off depending on two configurable frequencies.
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Connection |
Description |
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Input Fre |
The function counts 0 to 1 transitions at input Fre. Transitions from 1 to 0 are not counted.
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Parameter |
On: On threshold Range of values: 0000 to 9999
Off: Off threshold
G_T: Time interval or gate time during which the input pulses are measured. |
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Output Q |
Q is set or reset according to the threshold values. |
Parameter G_T
The gate time G_T can be provided by the actual value of another already-programmed function:
Analog comparator: Ax - Ay
Analog threshold trigger: Ax
Analog amplifier: Ax
Analog multiplexer: AQ
Analog ramp: AQ
Mathematic instruction: AQ
PI controller: AQ
Up/Down counter: Cnt
For the 0BA7 and later version devices, you can additionally use the actual values of the following already-programmed functions:
On-delay: Ta
Off-delay: Ta
On-/off-delay: Ta
Retentive on-delay: Ta
Wiping relay(pulse output): Ta
Edge triggered wiping relay: Ta
Asynchronous pulse generator: Ta
Stairway light switch: Ta
Multiple function switch: Ta
Stopwatch: AQ
Analog filter: AQ
Average value: AQ
Max/Min: AQ
Threshold trigger: Fre
You select the required function by the block number.
Timing diagram
Description of the function
The trigger measures the signals at input Fre. The pulses are captured during a configurable period G_T.
Q is set or reset according to the set thresholds. See the following calculation rule.
Calculation rule
If the threshold (On) ≥ threshold (Off), then:
Q = 1, if fa > On
Q = 0, if fa ≤ Off.
If the threshold (On) < threshold (Off), then Q = 1, if
On ≤ fa < Off.