Hello,

The aim is to measure speed. We have two optical sensors mounted next to each other on fixed distance 50mm.
There is a mechanical lever which movement breaks the sensor light beams.
As a result we get two 0-1 (positive) edges signals where one is delayed. This delay is proportional to the speed. The speed is calculated as "fixed distance" divided by "measured time". The real lever speed is about 1m/s which means about 50ms edge to edge delay.
Question: Is the Logo module (hardware latest version) able to measure the time difference 50ms in reasonable resolution?
It seems to me that even if the logo has dedicated "fast inputs" the "stopwatch" resolution is limited to 10ms time-base.
I am asking you might know some workaround how to do it. Otherwise I would need another specialized hardware...

gam01hr

Hello,

The aim is to measure speed. We have two optical sensors mounted next to each other on fixed distance 50mm.
There is a mechanical lever which movement breaks the sensor light beams.
As a result we get two 0-1 (positive) edges signals where one is delayed. This delay is proportional to the speed. The speed is calculated as "fixed distance" divided by "measured time". The real lever speed is about 1m/s which means about 50ms edge to edge delay.
Question: Is the Logo module (hardware latest version) able to measure the time difference 50ms in reasonable resolution?
It seems to me that even if the logo has dedicated "fast inputs" the "stopwatch" resolution is limited to 10ms time-base.
I am asking you might know some workaround how to do it. Otherwise I would need another specialized hardware...

 Speed in motion pulse could be measuring speed in frequency. If your application have continuous pulse on / off  or 0 / 1 then you may read the frequency as speed measuring with this function block.

ixo65

I think you don't understand.

He will time in 0,001 s, not only frequency.

 See his message what he want. You do not understand his message.?

Can we do conversion/ calculation.

Herz to RPM then to speed....like car Kilometres per hour or Mile per hour...?

I think the car engine Flywheel rotate in herz convert to RPM  convert to wheel RPM and the car speeding could calculated to KM/H.

Does it possible...?