Edge Triggered Wiping Relay - Siemens LOGO! Manual

LOGO! functions
4.4 Special functions list - SF
4.4.6

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.
Symbol in LOGO!
Parameters TH and TL
Note the information on parameter T in topic Time response (Page 115).
The pulse width TH and the interpulse width TL can be provided by the actual value of
another already-programmed function. You can use the actual values of the following
functions:
● Analog comparator (Page 165) (actual value Ax – Ay)
● Analog threshold trigger (Page 160) (actual value Ax)
● Analog amplifier (Page 173) (actual value Ax)
● Analog multiplexer (Page 194) (actual value AQ)
● Analog ramp (Page 197) (actual value AQ)
● Analog math (Page 209) (actual value AQ)
● PI controller (Page 201) (actual value AQ)
● Up/down counter (Page 151) (actual value Cnt)
Select the required function by the block number. The timebase is configurable. For
information on valid ranges and parameter defaults, refer to the On-delay (Page 123) topic.
132
Wiring Description
Input Trg A signal at input Trg (Trigger) triggers the times for
the edge triggered wiping relay.
Input R A signal at input R resets the current time (T
the output.
Parameter The interpulse width T
configurable.
N determines the number of pulse/pause cycles
TL/TH:
Range of values: 1...9
Retentivity:
/ = No retentivity
R = The status is retentive.
Output Q Q is set after TL has expired, and reset after TH has
expired.
) and
a
and the pulse width T are
L H
Manual, 10/2017, A5E01248535-AA
LOGO!