5/1/2016 7:09 PM |
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Joined: 1/27/2012 Last visit: 6/20/2024 Posts: 84 Rating: (1) |
Thank you. I will check that. |
5/3/2016 2:47 PM | |
Joined: 6/24/2013 Last visit: 10/15/2024 Posts: 1631 Rating: (421)
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Hi The library which deals with 64-bit REALs attached. it does contain function for PAC meter (which converts reading to dint in kWh and int for Wh) as well. for example for meter reading in double float = 1234567.234 function returns 1234567kWh (as dint) and 234Wh (as int) AttachmentIS0034_LONGREAL.zip (639 Downloads) |
Last edited by: Piotr.M at: 5/3/2016 4:11:49 PM |
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5/3/2016 5:18 PM | |
Joined: 1/27/2012 Last visit: 6/20/2024 Posts: 84 Rating: (1) |
Hello, I have S7-400H and Wincc SCADA. So in this case I can also use the full 64-bit tag of wincc and use the full range or accuracy of 64-bit. At least I have check in simulation on my laptop. I think this is a better solution. What do you say? |
5/3/2016 5:38 PM | |
Joined: 6/24/2013 Last visit: 10/15/2024 Posts: 1631 Rating: (421)
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1. Precision The PAC meter returns value in Wh so conversion to dint in kWh and int in Wh will not cause any loss of precision. 2. Arithmetic The S7-300/400 is unable to handle 64-bit real numbers and library (the above post) can be used should You need to do any calculations. If HMI can handle the 64-bit REAL and if all you need is to display the value it can be read from meter and displayed on the hmi. |
8/9/2016 3:50 PM | |
Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122) |
New question published by vipz is split to a separate thread with the subject Value is not updating in PLC. Best regards |
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