Trigger an output when a number changes

Lare said:
This should work for both setpoint and measure. Just set hysteresis value big enought if needed.

value_plus_hyst:= saved_value + hysteresis
value_minus_hyst:= saved_value - hysteresis

input_changed:=0; //oneshot bit

if input > value_plus_hyst
then
saved_value:= input;
input_changed:=1;
end_if;

if input < value_minus_hyst
then
saved_value:= input;
input_changed:=1;
end_if;
Click to expand...

Yes, but not relevant if it is the set-point change that needs to be recorded...

We have to wait for the OP's response...
 

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