IDEC FL1E-H12RCA User Manual page 192

IDEC SmartRelay functions
Parameter p (number of decimals)
Does not apply to Ax, Ay, On, Off and  values displayed in
a message text.
Does not apply to the comparison of on and off values! (The
compare function ignores the decimal point.)
Timing diagram
Ax
Ay
Ax - Ay
Q
for Ax - Ay > 200,
if On = Off = 200
Functional description
The function fetches the analog values from the inputs Ax
and Ay.
Ax and Ay are each multiplied by the value of the A (gain)
parameter, and the value at parameter B (offset) is then
added to the relevant product, i.e.
(Ax•gain) + offset = actual value Ax or 
(Ay•gain) + offset = actual value Ay.
The function forms the difference ("") between the actual
values Ax - Ay.
Output Q is set or reset, depending on difference of the
actual values Ax - Ay and the set thresholds. See the
calculation rule below.
Calculation rule
If the On threshold  Off threshold, then:
•
Q = 1, if:
(actual value Ax - actual value Ay) > On
Q = 0, if:
(actual value Ax - actual value Ay)  Off.
• If the On threshold < Off threshold, then Q = 1, if:
On  (actual value Ax - actual value Ay) < Off.
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IDEC SmartRelay Manual