A question regarding the CALCU block in CS3000
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This post was last edited by pe2 on 2015-7-1 21:32. If there are PV values A and B, an alarm C should be triggered when A-B is greater than or equal to 0.1. I wrote it in the CALCU block as follows: ALIAS A A.PV ALIAS B B.PV CPV=A-B IF(CPV>=0.1)THEN C.PV=1 END IF. However, with actual values of A=1.1 and B=1, CPV=0.1, and thus alarm C is not triggered; that is, it doesn’t work when the integer part is 1. I’d like to know where the problem lies
You have used this IF statement incorrectly. IF(CPV>=0.1)THEN C.PV=1 ELSE C.PV=0 END IF
It’s written down; ignore setting it back to 0 for now. Currently, when A=1.1 and B=1, C=1 cannot be triggered as long as both values are 1. Values like (2.1, 2) and (1.0, 0.9) work fine.
Actually, it’s not a difference of 0.1; 0.1 is just used for simplicity in order to facilitate speed reduction. The actual value here is 0.012. I can change it to 0.1, 0.001, or 0.003 – those work fine. But 0.002, 0.2, 0.3, and 0.004 don’t work at all; there’s no pattern to be seen, it’s confusing
Well, it turns out that when the difference is 0.012, the integer part being 1 doesn’t work; for other differences as well, there are certain integer values for the integer part that result in this not being valid. I’m not sure what’s going on