Threshold trigger

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! 12/24RCE/RCEo, LOGO! 24CE/24CEo): max 5kHz, if the fast input is directly connected to the threshold trigger function block

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

Parameter

On: On threshold

Range of values: 0000 to 9999

Off: Off threshold
Range of values: 0000 to 9999

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

For the 0BA7 and later version devices, you can additionally use the actual values of the following already-programmed functions:

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

Overview