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y_fx2000
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樓主  發(fā)表于: 2023-04-19 16:39
西門(mén)子的1200系列cpu做模擬量累積（例如做流量的累積），瞬時(shí)流量準確但累積流量不準確，偏差非常大，感覺(jué)上是低端cpu時(shí)間基準不準確導致的，因為用同樣的編程方法在S7-300和1500系列下又是準確的。不知道各位可否有什么好的解決辦法，請大神指導。
順便說(shuō)一下我是OB30里面做累積的，循環(huán)中斷時(shí)間為100ms
13930228124
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1樓  發(fā)表于: 2023-05-23 20:56
剛開(kāi)始累積應該是準確的，過(guò)一段時(shí)間后，一個(gè)很大的值加一個(gè)很小的值會(huì )出問(wèn)題。小值精度丟失，最終會(huì )被近似為0。導致總累積值不變

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