Siemens LOGO!, Руководство пользователя

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LOGO! functions
4.4 Special functions list - SF
LOGO!
172
Manual, 04/2011, A5E03556174-01
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! 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
a
) and
the output.
4
7UJ
5
3DU
Parameter The interpulse width T
L
and the pulse width T
H
are
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.
Parameters TH and TL
Note the information on parameter T in topic Time response (Page 151).
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 218) (actual value Ax – Ay)
● Analog threshold trigger (Page 213) (actual value Ax)
● Analog amplifier (Page 226) (actual value Ax)
● Analog multiplexer (Page 248) (actual value AQ)
● Analog ramp (Page 251) (actual value AQ)
● Mathematic instruction (Page 265) (actual value AQ)
● PI controller (Page 256) (actual value AQ)
● Up/down counter (Page 201) (actual value Cnt)
If your LOGO! is a LOGO! 0BA7, you can additionally use the actual values of the following
functions:
●
Analog filter (0BA7 only) (Page 271) (actual value AQ)
● Average value (0BA7 only) (Page 276) (actual value AQ)