Random Generator - Siemens LOGO! Manual

Functional description
You can configure the pulse/interpulse width at the T
parameters.
Input Inv can be used to invert the output signal, provided the block is enabled with a signal
at input EN.
If retentivity is not set, output Q and the expired time are reset after a power failure.
4.4.8

Random generator

Short description
The output of the random generator is set or reset within a configured time.
Symbol in LOGO!
Parameter T and T
H L
Note the defaults of the T
The on-delay time TH and the off-delay time 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)
LOGO!
Manual, 10/2017, A5E01248535-AA
Wiring Description
Input En A positive edge ( 0 to 1 transition) at input En (Ena-
ble) triggers the on-delay time of the random genera-
tor.
A negative edge ( 1 to 0 transition) at input En (Ena-
ble) triggers the off-delay time of the random genera-
tor.
Parameter The on-delay is set at random to a value between 0 s
and T
The off-delay is set at random to a value between 0 s
and T
Output Q Output Q is set when the on-delay has expired and if
En is still set. It is reset when the off-delay has ex-
pired, provided En was not set again meanwhile.
and T parameters listed in topic Time response (Page 115).
H L
4.4 Special functions list - SF
(Time High) and T
H
.
H
.
L
LOGO! functions
(Time Low)
L
135