User's Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
218 Manual, 04/2011, A5E03556174-01
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4.4.20 Analog comparator
Short description
The output is set and reset depending on the difference Ax - Ay and on two configurable
thresholds.
Symbol in LOGO! Wiring Description
Inputs Ax and Ay Inputs Ax and Ay are one of the following analog
signals:
• AI1 to AI8 (*)
• AM1 to AM6 (if 0BA6) or AM1 to AM16 (if 0BA7)
• NAI1 to NAI32 (if 0BA7)
• AQ1 to AQ2
• NAQ1 to NAQ16 (if 0BA7)
• Block number of a function with analog output
Parameter A: Gain
Range of values: ±10.00
B: Zero offset
Range of values: ±10,000
On: On threshold
Range of values: ±20,000
Off: Off threshold
Range of values: ±20,000
p: Number of decimals
Range of values: 0, 1, 2, 3
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Output Q Q is set or reset, depending on the difference Ax - Ay
and the set thresholds..
* AI1...AI8: 0...10 V corresponds with 0...1000 (internal value).