How would you go about setting up the totalizer using the READ_CLK system function?

I am designing a daily flow totalizer and this is a question I have yet to find an answer to as well.

Do I need any additional logic to support the READ_CLK system function?

Perhaps some sort of comparator block to compare the system clock with a "setpoint" to reset the totalizer?

Cyanogen281

How would you go about setting up the totalizer using the READ_CLK system function?

I am designing a daily flow totalizer and this is a question I have yet to find an answer to as well.

Do I need any additional logic to support the READ_CLK system function?

Perhaps some sort of comparator block to compare the system clock with a "setpoint" to reset the totalizer?

I am just thinking of setting up a "Daily" Flow reading. Such that, when 12 or 24 hours passes, the value in the flow meter register will either be deleted and a new accumulated value will begin, or, the value will be stored somewhere for say a week until the 7th day passes and it kicks out the value sequentially...

Thanks for the help,

Just my opinion....but I would use SCL logic to create a FB block which you can use in CFC.
And to make it fully adaptable, I would make a block which can be reset hourly, daily, weekly, monthly, yearly just by setting an input signal on the block.

You can use the sample_t with attribute S7_sampletime. You can just make the counter like this:

Actual_time := Actual_time + SAMPLE_T;

I doesn't matter which OB you put it in (OB31,33,35 etc), the sample time is always in seconds.

New question published by SimoAv is split to a separate thread with the subject flow totalizer.

Best regards
Min_Moderator