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LOGO! functions

4.4 Special functions list - SF

LOGO!
Manual, 04/2011, A5E03556174-01

177

4.4.8

Random generator

Short description

The output of the random generator is set or reset within a configured time.

Symbol in LOGO!

Wiring

Description

Input En

A positive edge ( 0 to 1 transition) at input En

(Enable) triggers the on-delay time of the random

generator.
A negative edge ( 1 to 0 transition) at input En

(Enable) triggers the off-delay time of the random

generator.

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

(Q
3DU

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

expired, provided En was not set again meanwhile.

Parameter T

and T

Note the defaults of the T

and 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 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