Threshold trigger

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Short description

The output is switched on and off depending on two configurable frequencies.

 

Connection

Description

Input Fre

The function counts 0 to 1 transitions at input Fre. Transitions from 1 to 0 are not counted.

  • Use the inputs I3, I4, I5, and I6 for high-frequency counts (LOGO! 12/24 RC/RCo and LOGO! 24/24o): max. 2 kHz:

  • Use any other input or circuit element for low frequencies (typical 4 Hz).

Parameter

On: On threshold
Range of values: 0000...9999

Off: Off threshold
Range of values: 0000...9999

G_T: Time interval or gate time during which the input pulses are measured.
Range of values: 00:05 s...99:99 s

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:

You select the required function by the block number.

Timing diagram

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fa = Input frequency

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

 

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0BA0-0BA3:

The following calculation rules apply

  • If Fre > threshold (On), then:
    Q = 1

  • If Fre <= threshold (Off), then:
    Q = 0

 

 

Overview