Hello FogBot,

your problem is, i will say, a standard problem to count pulses per time amd convert this value into a physical unit.

Some times ago i have wrote some solutions for this in the german forum part. Here a sort summary of this:

The First solution is to use the special function "threshold trigger" connected to a input I5 or I6. Set the Parameter "time interval" or "gate time" G_T = 1 and then you get the frequency of the input signal. In some cases you can change G_T to get a result in physical units, e.g. 2000 pulses --> 40 gpm needs a translation-factor m = 1/50 = 0,02. That means, set G_T = 0,02 and you have what you wont, but sorry the Handbook says G_T must be >= 0,05 s and the next problem is, that the result value can only displayed (not used in other LOGO-functions!

The second solution ist to add a frequency divider between the input pin and the special function "threshold trigger". Put a counter block, a digital flag block and a the special function "threshold trigger" ina serial signal line and add a connect from the output of the digital flag block to the clear-pin of the counter. Then set the parameter ON of the counter ON = 1...n. Then you get a input frequency for the special function "threshold trigger" f = finput / n. Now you can define G_T in a range of values with: n / G_T = m.Example: G_T = 0,2 s and n = 10, but the result value can only displayed (not used in other LOGO-functions!

Because of this i have programmed my own modified threshold trigger function. Look at the attachment (sorry only with german connents)...third solution....

...The blocks B001 and B004 are only for the PC-simulation. You must exchange them with an input pin I5 or I6 (Signal A).
The impuls generator block B110 sets the äquivaltent value of G_T. That means TH + TL = gate_time (TL must be 0,01 s).
The counter B113 counts the pulses into every cyclic generated gate_time and the combination of the "Analoge multiplexer + 1. amplifier" B007 + B003 memories the result of the counter from the previous measurement-time. That means in the same way as the original funktion is the previous measured value memoried during the next is in work. The last amplifier B008 (sometimes you need more than one) is used to translate the result into physical units with:
final result Ax (B008) = Ax(B003) * GAIN(B008) + OFFSET(B008) with normaly OFFSET = 0 and GAIN = (10**k * m [s]) / (TH+TL) [s] and k = number of decimal digits set for the display.

==>> Synergetic effects of the modified threshold trigger function in relation to the original LOGO-function:
1. You can use the final result Ax (B008) as reference in an other block

2. You can scale the final result Ax (B008) with a number of decimal digits for display and own use (interpretation with a factor 1/10**k)

3. You can synchronized two ore more modified threshold trigger functions (with a trigger RUN/STOP B110 and äquivalent).

Ok, i hope you unterstand the sheed and this helps you to solve you proplem.

Best regards
Betel

Hello FogBot,

thanks for your positive feedback! Too few new members search a lot for answers...they unfortunately in the forum contributions secure many of their questions could answer so self...

Presumably you searched, however, not in the German part. I do not know also your application and especially your gate times. My circuit design has the disadvantage as the original block at long gate times, that during the current measurement no updating of the advertisement occurs. Therefore I had published in the German part of this forum a modified circuit design under:

Durchschnitt über 8 Stunden

and to download the attachment direct, use:

Demo_gleitender_Mittelwertzähler.zip

In this case the measurement period (=gate tiome) is cut into several subdivides ( 8 counters) part measurements and a memory (= 9. counter) for the display. For example a gate time to count pulses so in the time of 8 x n (n defines through TH+TL of an impulse generator), at which is n the time period to update the result of the measurement over the hole time of 8xn (and for example displayed). The 9 counters are rotate cyclic tomemory the result and every counter counts over the gate time = 8 x n !!!

Sorry, the comments are only in German. You should have therefore questions, then ask here...

Best regards
Betel