Analog Differential Trigger - Siemens LOGO! Manual

4.4.17

Analog differential trigger

Short description
The output is set and reset depending on a configurable threshold and a differential value.
Symbol in LOGO!
* AI1...AI8: 0...10 V corresponds with 0...1000 (internal value).
Gain and offset parameters
Please note the information on gain and offset parameters in topic "Calculating the gain and
offset of analog values (Page 117)".
Parameter p (number of decimals)
Does not apply to the display of On, Off and Ax values in a message text.
Timing diagram A: Function with negative difference Δ
LOGO!
Manual, 10/2017, A5E01248535-AA
Wiring Description
Input Ax You apply the analog signal to be analyzed at input
Ax.
Use the analog inputs AI1...AI8
AM1...AM6, the block number of a function with ana-
log output, or the analog outputs AQ1 and AQ2.
Parameter A: Gain
Range of values: ±10.00
B: Zero offset
Range of values: ±10,000
On: On/Off threshold
Range of values: ±20,000
Δ: Differential value for calculating the off parameter
Range of values: ±20,000
p: Number of decimals
Range of values: 0, 1, 2, 3
Output Q Q is set or reset, depending on the threshold and
difference values.
LOGO! functions
4.4 Special functions list - SF
* , the analog flags
( )
163