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05-22-2007, 9:04 AM vietthum Joined on 04-05-2007 Posts 2 How can I get the totalizer value from analog input? Hello, I am the newcommer with OPTO22. I use SNAP-PAC-R1. 1. I want to get the totalizer value from analog input (flowrates) from a flow meter. How to do it? 2. I want to get the totalizer value from Digital input from Pulse of flow meter. And I want to calculate the flowrates from this Pulse input. How to do it? Could any one help me please? Above 02 question can be solved in SNAP-PAC-R1? Thanks & Best regards, Nguyen Vinh Loc    Report

04-04-2008, 8:19 AM AWPI Joined on 04-04-2008 Posts 1 Re: How can I get the totalizer value from analog input? 1. You will need a time delay in your routine so this will be more accurate. A delay of about a second should do the trick. I recommend using a timer vs. just using the Delay command. Set an UpTimer with a target of 1 second. When that value has been reached, use the equation UpTimer / 60 x Analog = Totalizer. Add this Totalizer to a running total. Then reset your UpTimer. 2. For this you will need a delay as well. Using an UpTimer as well, use a delay of a couple seconds. The accuracy of this will depend on the pulse rate and the time delay you have chosen. Higher pulse rates may exceed the digital input scan rate. Get & Clear Counter. I then like to Start Counter just in case it stops for any reason. Then multiply your pulses (Counter) times your rate. Add it to a Totalizer. For the rate, Multiply the Counter value you just got by the Uptimer divided by 60 (Rate = Counter * Uptimer / 60). Both responses assumes flow rates of per minute. The Uptimer itself is used in the equation to make the result more accurate. Using a DownTimer or the UpTimer Target in the equation won't account for the time elapsed since the UpTimer Target was reached.    Report

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