Asynchronous Pulse Generator - Siemens LOGO! Manual

LOGO! functions
4.4 Special functions list - SF
4.4.7

Asynchronous pulse generator

Short description
The output pulse shape can be modified by reconfiguring the pulse/pause ratio.
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.
Timing diagram
134
Wiring Description
Input En You can use input EN to set and reset the asynchro-
nous pulse generator.
Input INV Input INV can be used to invert the output signal of
the active asynchronous pulse generator.
Parameter You can configure the pulse width T
pulse width T
Retentivity:
/ = No retentivity
R = The status is retentive.
Output Q Q is set and reset cyclically according to the
pulse/pause ratio T
and the inter-
H
.
L
and T .
H L
Manual, 10/2017, A5E01248535-AA
LOGO!