thecarb Posted February 4, 2016 Report Share Posted February 4, 2016 Hi all, I have a project with an analog input which connected to a level transmitter. If I directly show the input on the screen, it can change 2-3 times in a second as it is not very stable. So I tried to solve it with sampling with a timer. Timer runs as soon as PLC starts to run. When timer reaches to its "set time", it copies the data on the analog input to a bit and reset itself. On the screen I see the "bit" value. The problem is after some amount of time, lets say 3-4 days, it stops to copying the value and display shows the same value even if the level reaches to full. What do you think? What am I doing wrong? Thanks in advance. Link to comment Share on other sites More sharing options...
MVP 2023 Flex727 Posted February 4, 2016 MVP 2023 Report Share Posted February 4, 2016 I assume by "bit" you mean an MI operand? Did you try using the built-in filtering available for the analog inputs? There is also a filter function block available to use. Link to comment Share on other sites More sharing options...
thecarb Posted February 4, 2016 Author Report Share Posted February 4, 2016 Yes, "bit" was an MI. I tried to activate the filter from the Hardware configuration but I cannot see the filter section on that screen. I am using V570 and V200-18-E1B. Doesn't have this PLC and I/O filtering? Link to comment Share on other sites More sharing options...
MVP 2023 Flex727 Posted February 5, 2016 MVP 2023 Report Share Posted February 5, 2016 Most of the Snap-In modules do not have analog input filtering. Use the filter function block in VisiLogic. Link to comment Share on other sites More sharing options...
Henny Posted February 5, 2016 Report Share Posted February 5, 2016 Hello Besides the filter function it would Also be an option to put si13 as a contact condition Before your linearisation function. Your input from the io card is then scaled only one time per second. Kind regards Henny Link to comment Share on other sites More sharing options...
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