10/12/2011 5:34 PM | |
Posts: 8 Rating: (1) |
I would also like to know endianness in the data transmitted by PAC3100. ie Big Endian or Small Endian between the two words in the 32-bit data. |
10/13/2011 9:34 AM | |
Joined: 3/21/2006 Last visit: 10/1/2024 Posts: 10229 Rating: (1181) |
Almost the same issue Using DOuble Float in STEP7 It might helps you. Best regards, Hristo Mihalev |
11/11/2011 6:51 AM | |
Joined: 11/21/2007 Last visit: 9/25/2024 Posts: 2325 Rating: (308) |
Dear srk Both ( 32bit as well as 64bit formats ) of SIEMENS conform to IEEE 754 format. They consist of Sign Bit, Exponent and Mantissa as described in attached document. Generally if you convert from 64bit float to 32bit float, there can be loss of accuracy. However this can be achieved without significant loss of accuracy in case of PAC3100 as max value of energy registers in case of PAC3100 is 10E12 only. Hope this helps Cheers Navnag Attachment64bit Floating Point No.PDF (1039 Downloads) |
There is no such thing as the last bug in a program |
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1/12/2012 1:48 PM | |
Joined: 4/28/2011 Last visit: 6/7/2024 Posts: 8 Rating: (1) |
ThePAC 3100 energy counters are also available as 32-bit values via Modbus RTU.Thisdoes not require some additional options. See this FAQ for more Details: http://support.automation.siemens.com/WW/view/en/40345680/
This 32-bit values are also available in PAC 3200 and 4200. PAC 3200 Firmware version 2.1.0or newer isrequired: http://support.automation.siemens.com/WW/view/en/31674577/ |
Last edited by: Aquadukt at: 1/12/2012 1:52 PM |
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