IDEC SmartRelay functions
178 IDEC SmartRelay Manual
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
com
pare func
tion ignores the decimal point.)
Timing diagram
Functional description
The function fetches the analog values from the inputs Ax
an
d Ay.
Ax and Ay are ea
ch multiplied by the value of the A (gain)
para
meter, 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
a
ctual va
lues 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 thr
eshol
d, then Q = 1, if:
On (actual value Ax - actual value Ay) < Off.
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