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:
Analog comparator: Ax - Ay
Analog trigger: Ax
Analog amplifier: Ax
Analog multiplexer: AQ
Analog ramp: AQ
Analog math: AQ
PI controller: AQ
Up/Down counter: Cnt
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
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.