Spyros73 Posted May 2, 2017 Report Share Posted May 2, 2017 Hello, I am using SAMBA PLC (4.3 and 7.0 as well) for historic car rallies, in order to calculate ideal distance based on time and a given average speed. I have noticed that the RTC has a strange behaviour. I syncronize my PLC RTC with an accurate digital clock, and after a few minutes, I can notice already, a small difference (e.g. 3/10 of a second). But after a while, the two clocks are syncronized again. I tried also the following. I used the SB 15, which comes true 10 times per sec, and I increase a ML15 every time SB 15 is true. In parallel, I created a bit (MB6) which comes true, every time the RTC seconds change. Based on it, I increase ML10 by 10 this time. I compare those 2 values every second. If everything was ok, the difference of these values should always be 0, or at least something fix, but in fact I see that this difference is changing, from 0 to 5 (means max difference 0,5 sec) Why this occurs, and is there anyway to avoid it? In fact I need an accurate RTC, which will always be synchronized with the rally organization clock. Thank you in advance Quote Link to comment Share on other sites More sharing options...
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