Hi sprutz,

I am verry happy about your solution of a memory for analog values (with only one block "Analog math") and the addition part (with only 3 blocks "Analog math") to use with a LOGO!-0BA6 (only)!

For a german user i have build some time ago a solution for the same input signal type as yours under:

"Ermittlung von Wartungsintervallen nach Belastung einer Anlage"

Because the needed complex modifications of your circuit and because my english is not good enough to explain all details, i have modified the circuit complete (file: FlowTot_new (0BA6).lsc). My modifications solve your question AND reduce some detected problems (lost of flow you counted AND rounding errors!):

1. If the trigger (if Ax{B125} = or > 1000) clears the values and Ax{B125} > 1000, then you have a lost flow volume of "Ax(B125) - 1000" gal !!
2. The division with the value 30 to correkt the measured value to your used time base of 2 seconds let you have a reduction of resolution, rounding errors and as result count errors of the flow volume sum!

Look at my complex modifications. I have used a pre-divider (retentive!) to solve your question. This can also used direct in your circuit to reduce the lost flow volume if pover goes off.

In the attached solution this pre-divider is also used to "calculate" the division with 100 (in your circuit 30). This way give us a better resolution of the measuring AND we have the possibility to memory retentive nearly all the flow volume (the maximum lost error i have described by an equation into the file).
My solution includes in addition a reduction of the time base from 2 s to 0,6 s. I have changed your addition part to calculate the sum with the remainder part, if the trigger value was bigger than 1000 (or in my modification: k = maximum sensor value GPM).
And i have included an automatik calculation of nearly all needed block parameters to get the best resolution of the measured values by different values k.

Remenber:
a) All red text means, that i have change or add this block or block parameters.
b) All blue text means, that this comment can be usefull for you.
c) For the block B001 i have add a universal and flexible key input circuit (F-key are possible to use, too). The file "DEMO_key_input_of_a_value_from_a_user_defined_range(0BA6).lsc" let you set the start value, the step with and the number of steps (and so the maximum value)!

I hope you can understand and use my modifications of your circuit?

Best regards
Betel

Perhaps helpful links:
Collection of notes and circuits for the use and programming the LOGO!
Scalingof signals with analog blocks
retreving data from logo