Short description
The output with off-delay resets after a defined time has expired.
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Connection |
Description |
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Input Trg |
Start the off-delay time with a negative edge (1 to 0 transition) at input Trg (Trigger). |
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Input R |
Reset the off-delay time and set the output to 0 via the R (Reset) input. Reset has priority over Trg. |
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Parameter |
T: The output is switched off on expiration of the delay time T (output signal transition 1 to 0). |
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Output Q |
Q switches on for the duration of the time T after a trigger at input Trg. |
Parameter T
The actual value of another already-programmed function provides the time set in parameter T:
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.
For information on the validity and accuracy of the time base, refer to the LOGO! Manual.
Timing diagram
Description of the function
A 0 to 1 transition at input Trg sets output Q to 1 instantaneously.
At the 1 to 0 transition at input Trg, LOGO! retriggers the current time T, and the output remains set. LOGO! resets the output Q 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.