User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 06/2014, A5E33039675
191
Application
Internal mapping
Range of values:
-30 °C to 70 °C = 100
1000
→ Gain = 100/1000 = 0.1
On threshold = 15 °C
Threshold = 15
Off threshold = 5 °C
Threshold = 5
See also topic "Calculating the gain and offset of analog values (Page 130) ".
Configuration (example):
View in parameter assignment mode (example):
View in the message text (example):
Reducing the input response of the analog comparator
You can selectively delay the output of an analog comparator 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