IDEC SmartRelay Manual
185
IDEC SmartRelay functions
4.4 Special functions list - SF
Timing diagram
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 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 if (actual value Ax - actual value Ay) On or
0 if (actual value Ax - actual value Ay) Off.
If the On threshold < Off threshold, then 1, if On (actual value Ax - actual value Ay) <
Off.
Setting the Par parameter
The gain and offset parameters are used to adapt the sensors to the relevant application.
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