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Siemens LOGO Soft Comfort Online Help Manual

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Reference material
5.3 Special functions
LOGO!Soft Comfort Online Help
252 Operating Instructions, 11/2017
Description of the function
A 0 to 1 signal transition at input Trg triggers the current time Ta. LOGO! sets the output Q to
1 when Ta reaches the time T. A further pulse at input Trg does not affect Ta.
The output and the time Ta reset to 0 only with a 1 signal at input R.
If you do not set the retentivity, output Q and the expired time reset after a power failure.
Special functions (Page 241)
5.3.1.5
Wiping relay (pulse output)
Short description
An input signal generates an output signal of a configurable length.
Connection
Connection
Description
Input Trg
You trigger the time for the wiping relay with a signal at input Trg (Trigger).
Parameter
T
represents the time after which the output resets (output signal transition 1 to
0).
Retentivity on = the status is retentive in memory.
Output
Q
A pulse at
Trg
sets
Q
. The output stays set until the time
T
has expired and if
Trg
= 1 for the duration of this time. A 1 to 0 transition at
Trg
prior to the expiration of
T also resets the output to 0.
Parameter T
The actual value of another already-programmed function can provide the off time 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
… 252 …


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