User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 04/2011, A5E03556174-01
175
4.4.7 Asynchronous pulse generator
Short description
The output pulse shape can be modified by reconfiguring the pulse/pause ratio.
Symbol in LOGO! Wiring Description
Input En You can use input EN to set and reset the
asynchronous 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
H
and the
interpulse width T
L
.
Retentivity:
/ = No retentivity
R = The status is retentive.
4
(Q
,QY
3DU
Output Q Q is set and reset cyclically according to the
pulse/pause ratio T
H
and T
L
.
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!
0
BA7, 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)
● Max/Min (0BA7 only) (Page 273) (actual value AQ)
● On-delay (Page 160) (current time Ta)
● Off-delay (Page 164) (current time Ta)