Emerson Exchange 365

• Not Answered

register a value over 24 hour period to capture highest number during that time.

Good morning, hope everyone has plans for a great holiday weekend.

I am wanting to monitor a conductivity number over 24 hour period and record the highest value during a 24 hour period and display it on my totalizer page. not quite sure how to go about it as we haven't done this anywhere else in the facility.

treycunningham

• 27 Nov 2019 4:13 PM
• Cancel

5 Replies

• KeithStThomas

  

  • 27 Nov 2019 4:38 PM

  Did you want the highest value in a day, or the highest value in a rolling 24hr window?
  
  If you want the highest value in a day, say between 6am and 6am, then set a output parameter to zero at the start of the time period (a DTE block can generate a pulse bit at 6am), use the MAX function in a calc to compare the meter reading to the stored parameter reading. Store the new MAX reading to the output parameter . Zero it again at 6am the next day. repeat.
  
  If you want a rolling 24hr window, then you need to decide how frequently to sample the data. Store the data in a floating point array, which can hold 240 data points (which equates to a sample every 360 seconds), then build a function to select the MAX reading within the array. If you need faster sampling then try using more arrays, but I suspect the coding to support this will quickly become complicated.

  • Cancel
• Tom Light

  

  • 27 Nov 2019 4:55 PM

  In reply to KeithStThomas:

  the conductivity number goes up and down throughout the day. dependent on chemical process for treating water. what I need is the highest conductivity throughout the day. obviously a fast sampling would require a ton more coding I was just wondering if any had done it.

  • Cancel
• KeithStThomas

  

  • 27 Nov 2019 7:19 PM

  In reply to Tom Light:

  Use the first option than. You can sample at a fast rate and compare to a saved value with the MAX function in a calc block, and write the higher value back to the saved value location. Reset the saved value at the start of the day.

  • Cancel
• Jason.Brumfield

  

  • 28 Nov 2019 7:33 PM

  In reply to KeithStThomas:

  When I do this, I use a comparator block and use the GT to initiate an action block that writes the current value to the Disc_comp. A DTE can reset the value to zero whenever you wish to start over.

  • Cancel
• Tom Light

  

  • 2 Dec 2019 1:28 PM

  In reply to Jason.Brumfield:

  thanks Keith, we will give it a shot.

  • Cancel