Off-delay

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Short description

The output with off delay is not reset until a defined time has expired.

 

Connection

Description

Input Trg

Start the off-delay time with a negative edge (1 to 0 transition) at input Trg (Trigger).

Input R

Reset the off-delay time and set the output to 0 via the R (Reset) input.

Reset has priority over Trg.

Parameter

T:  The output is switched off on expiration of the delay time T (output signal transition 1 to 0).

Retentivity on = the status is retentive in memory.

Output Q

Q is switched on for the duration of the time T after a trigger at input Trg.

Parameter T

The time set in parameter T can be supplied by the value of another already-programmed function:

You select the required function by the block number.

For information on the validity and accuracy of the time base, refer to the LOGO! manual.

Timing diagram

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Description of the function

Output Q is set to 1 instantaneously with a 0 to 1 transition at input Trg.

At the 1 to 0 transition at input Trg, LOGO! retriggers the current time T, and the output remains set. The output Q is reset to 0 when Ta reaches the value specified in T (Ta=T) (off delay).

A one-shot at input Trg retriggers the time Ta.

You can reset the time Ta and the output via the input R (Reset) before the time Ta has expired.

 

Overview