IDEC SmartRelay functions
174
IDEC SmartRelay Manual
Gain and offset parameters
For more information on gain and offset parameters, refer to
Chapter 4.3.6.
Parameter p (number of decimals)
Applies only to the Aen, Ax and
∆
values displayed in a mes-
sage text.
Timing diagram
Functional description
A 0 to 1 transition at input En saves the value of the signal at
the analog input Ax. This saved process variable is referred
to as “Aen”.
Both the analog actual values Ax and Aen are multiplied by
the value at parameter A (gain), and parameter B (offset) is
then added to the product, i.e.
(Ax • gain) + offset = Actual value Aen, when input En chang-
es from 0 to 1, or
(Ax • gain) + offset = Actual value Ax.
Output Q is set when the signal at input En = 1 and if the ac-
tual value at input Ax is out of range of Aen
±
∆
.
Output Q is reset, when the actual value at input Ax lies with-
in the range of Aen ±
∆
, or when the signal at input En
changes to lo.
Q
Aen +
∆
Ax
En
Aen –
∆
Aen
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com
