https://forge.codesys.com/forge/talk/Engineering/thread/e401d4770b/2020-04-08T08:40:15.386000ZRecent posts to Datalogging2020-04-08T08:40:15.386000Z2020-04-08T08:40:15.386000Zdpetrutiuhttps://forge.codesys.com/u/dpetrutiu/https://forge.codesys.com1cfd25f24acf4cda0b01b8630207cafe04458e85

<div class="markdown_content"><p>Hi Leifjoh, </p> <p>Can you let us know how you've made the totalizer? <br/> Which time did you choose for the the integral function?<br/> I'm struggling with this choosing a right time for L/min or L/sec. </p> <p>The integral functions that I'm using come from the Util.library or CAAMathematics and Basic.OSCAT</p> <p>Thanks,<br/> Dragos</p></div>

2020-02-27T13:59:17.387000Z2020-02-27T13:59:17.387000Zleifjohhttps://forge.codesys.com/u/leifjoh/https://forge.codesys.comc623a10b247c78ced84d5189c3f08c088d6da4b1

<div class="markdown_content"><p>Thanks for that answer Scott,<br/> A much simpler solution to this and it works perfectly. <br/> BR</p></div>

2020-02-27T13:59:17.091000Z2020-02-27T13:59:17.091000ZAnonymoushttps://forge.codesys.com/u/*anonymous/https://forge.codesys.com8e935a1fbfc86796108b82c8befd5e4d392fcc94

<div class="markdown_content"><p><em>Originally created by:</em> scott_cunningham</p> <p>Move your variable to a VAR PERSISTENT. These are retained even after power cycle (if your hardware supports it). Then, your SD card is only a report of the value of your variable.</p></div>

2020-02-27T13:59:16.197000Z2020-02-27T13:59:16.197000Zleifjohhttps://forge.codesys.com/u/leifjoh/https://forge.codesys.comea8cd1ebb010b3b218680c74b40ff7824f4ac5bd

<div class="markdown_content"><p>Hello,</p> <p>I have a question and hope someone can help me a bit with this.</p> <p>I have made type of Energy meter used for a water heat exchanger.<br/> I measure flow (L/sec), temperature in and out of water to be heated.</p> <p>With these values I have made a totalizer with the Integral function.</p> <p>I am logging the values to a txt file on a SD card continuisly as such:<br/> 0 (kJ)<br/> 2<br/> 4<br/> 6<br/> 7<br/> 7<br/> 8<br/> 9 (kJ)</p> <p>The kilojoules are counting up and the newest logged value is the total kJ.</p> <p>The problem now is that if there is a power outage and the PLC starts at zero again.<br/> I need to load the previous latest logged value to a variable and add it to the formula.</p> <p>Is there a way to load a value from the SD card? Or how would you solve this?</p> <p>Any input is very much appriciated </p> <p>Thank you.</p></div>