Detect changes in analog value

[madito]

Good Morning,

I am trying to make a delay when I detect a change in an analog input value.

Would you know how to do it easily?

Thanks!

[Labmaster]

Easiest way to detect changes of a analog value, is to feed the analog value to one input of an "Unequal" comparison block, on the other input you feed in the same signal but a little bit delayed (at least two processing cycle delayed). As delay you could use "memory flags" set to analog with a delay of '2'.

BTW:
theoretically 1 processing delay cycle should be enough but it seems there is a bug in the loxone system when processing analog signals, so i found out that 2 cycles are needed for a constant result.






How to delay something then, depends on what exactly you have to delay.

[duncan]

something like this

[Labmaster]

duncan
be carefull, your shown solution is not save against short analog changes, means changes that are shorter than the configures pulse time of the impulse generator, where shorter pulse times may generate higher load on the system.

[madito]

Easiest way to detect changes of a analog value, is to feed the analog value to one input of an "Unequal" comparison block, on the other input you feed in the same signal but a little bit delayed (at least two processing cycle delayed). As delay you could use "memory flags" set to analog with a delay of '2'.

BTW:
theoretically 1 processing delay cycle should be enough but it seems there is a bug in the loxone system when processing analog signals, so i found out that 2 cycles are needed for a constant result.






How to delay something then, depends on what exactly you have to delay.

Perfect!!!! Thanks