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TIAp V14 add real in DB problem

4/7/2025 8:14 AM	Rate (0)
jacek_ratajczyk172 Joined: 4/7/2025 Last visit: 10/4/2025 Posts: 2 Rating: (0)	Dear all, sorry to disturb with such a silly problem - I'm trying to increment values in Shared DB. One real value is adding without problems and the other not. Where do I have a mistake? Adding is done by trigger input I1.0 after rising edge. Actual_Read is incremented, but the Total_MAT1 not, and they're part of the same DB. They're not overwritten in other part of program. What am I missing? Thank you in advance. Attachment tiap.png (139 Downloads)

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4/7/2025 8:29 AM	Rate (0)
Towome Platinum Expert Joined: 7/9/2015 Last visit: 12/17/2025 Posts: 4493 Rating: (644)	Hi, your logic is OK but you calculate with Real Datatype. Use LREAL for more accuracy. Check this FAQ: How accurately can I calculate with REAL numbers that are used in extensive formulas? Regards, Towome
	Last edited by: Towome at: 04/07/2025 08:29:34 If my post was useful, please rate me - if not, please tell me - thank you!
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This contribution was helpful to 1 thankful Users jacek d

4/7/2025 10:00 AM	Rate (0)
jacek_ratajczyk172 Joined: 4/7/2025 Last visit: 10/4/2025 Posts: 2 Rating: (0)	I wonder why only the first value (Actual_Length) is incremented, while the other (Total) isn't :(

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4/7/2025 2:41 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 12/23/2025 Posts: 16325 Rating: (2520)	I did not look at the logic nor the actual values. Perhaps you could have included those values. For example, in the case of tags of datatype REAL, incrementing tags with values > 9.999999E07, the next increment by 1 gets lost because there is not enough precision available for the REAL datatype to represent the data. jacek_ratajczyk172 I wonder why only the first value (Actual_Length) is incremented, while the other (Total) isn't :(
	science guy
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