Edge triggered wiping relay

Short description

An input pulse generates a preset number of output pulses with a defined pulse/pause ratio (retriggerable), after a configured delay time has expired.

Connection

Description

Input Trg

You trigger the times for the Edge-triggered wiping relay with a signal at input Trg (Trigger).

Input R

The output and the current time Ta resets to 0 with a signal at input R.

Parameter

T H , T L : The pulse width T H and the interpulse width T L are adjustable.

N determines the number of pulse/pause cycles T L /T H:
Value range: 1 to 9.
Retentivity on = the status is retentive in memory.

Output Q

Output Q sets when the time T L has expired and resets when T H has expired.

0BA2, 0BA3:
Only the parameter TH exists. TH represents the off-delay time for the output.
Input R is not available.

Parameters TH and TL

The actual value of another already-programmed function can provide the pulse width TH and the interpulse width TL:

  • 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 change at input Trg to 1 triggers the time TL (time low). After the time TL has expired, LOGO! sets the output Q to 1 for the duration of the time TH (time high).

If LOGO! retriggers the input Trg prior to the expiration of the preset time (TL + TH), the time Ta resets and the pulse/pause period is restarted.

Overview