IDEC SmartRelay Manual
181
IDEC SmartRelay functions
4.4 Special functions list - SF
4.4.19 Analog differential trigger
Short description
The output is set and reset depending on a configurable threshold and a differential 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 126).
Parameter p (number of decimals)
Applies only to the display of On, Off and Ax values in a message text.
Timing diagram A: Function with negative difference
Symbol in
IDEC SmartRelay
iring Description
Input Ax Input Ax is one of the following analog signals:
AI1 to AI8 ()
AM1 to AM64
NAI1 to NAI32
A1 to A8
NA1 to NA16
Block number of a function with analog output
Parameter A: gain
Range of values: -10.00 to 10.00
B: zero offset
Range of values: -10,000 to 10,000
On: On/Off threshold
Range of values: -20,000 to 20,000
: differential value for calculating the off parameter
Range of values: -20,000 to 20,000
p: Number of decimals
Range of values: 0, 1, 2, 3
Output is set or reset, depending on the threshold and
difference values.
AI1...AI8: 0...10 V corresponds with 0...1000 (internal value).
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