IDEC SmartRelay functions
IDEC SmartRelay Manual 175
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
Functional description
The function fetches the analog signal at input Ax.
Ax is multiplied by the value of the A (gain) parameter, and
the valu
e at pa
rameter B (offset) is added to product, i.e.
(Ax•gain) + offset = actual value of Ax.
Output Q is set or reset, depending on the set (On) thresold
and difference value ()
. The function automatically
calculates the Off parameter: Off = On + , whereby may
be positive or negative. See the calculation rule below.
Calculation rule
• When you set a negative differential value , the On
th
reshold
Off threshold, and:
Q = 1, if the actual value Ax > On
Q = 0, if the actual value Ax Off.
See the timing diagram A.
• When you set a positive differential value ,
the On
th
reshold < the Off threshold, and Q = 1, if:
On actual value Ax < Off.
See the timing diagram B.
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