Reducing The Input Response Of The Analog Comparator - Siemens Logo! Manual

LOGO! functions
Press
B3
Ax =+00010
Ay =–00020
n
View in the message text (example):
Ax =+00010
Ay =–00020

Reducing the input response of the analog comparator

You can selectively delay the output of an analog compara-
tor by means of the "On-delay" and "Off-delay" special
functions. With on-delay, output Q is only set if the pulse
width of the triggering signal at input Trg ( =analog
comparator output) is longer than the on-delay time.
Using this method, you will obtain a virtual hysteresis and
reduce the input response to short signals.
Function block diagram
AI1
AI2
192
2
=+00030
AI
Analog comparator
B1
nA
AI
Temperature values
Q = 1 (differential value > On)
On-delay
B2
Off-delay
B3
Q1
LOGO! Manual
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