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Swapping of Floating point

Created by: AnsuAbinesh at: 3/15/2011 6:14 AM (13 Replies)

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4/5/2011 1:58 AM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 4/14/2021 Posts: 10586 Rating: (2246)	Ganesan_K I did following logic for byte swapp. L DB204.DBB0 T DB100.DBB2 L DB204.DBB1 T DB100.DBB3 L DB204.DBB2 T DB100.DBB0 L DB204.DBB3 T DB100.DBB1 I have read kwh vaue in DB204.DBD0. Then i move to DB100.DBD0 Am i correc or wrong? but iam not getting proper value in DB100.DBD0 instead of iam getting in DB100.DBD2 . Hello Ganesan; Could you open a VAT showiing (in Hex) the contents of each byte you are swapping, plus DB100.DBB4 and DB100.DBB5and also the content of DB204,DBD0, DB100.DBD0 and DB100.DBD2? Then take a screeshot of the Vat and post it on the forum (as a jpg file). That way we should be able to understand what is happening here. What is strange is that you should have a plausible value in DB100.DBD2, which comprises bytes DBB2, DBB3, DBB4 and DBB5. You are not writing to DBB4 abd DBB5 in your swap program, so what values do you have there. Hope this helps, Daniel Chartier

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4/8/2011 7:39 AM	Rate (0)
AnsuAbinesh Experienced Member Joined: 12/14/2010 Last visit: 10/8/2020 Posts: 112 Rating: (0)	Dear Experts, Here i have attched screen shot for your reference. In that attachment DB204.DBD262 as real value which is reading from EM6400 meter. MD20 as a swaping address. Attachment Swap screen shot.zip (132 Downloads)

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4/8/2011 2:06 PM	Rate (0)
Chilly_Garfield Bronze Member Joined: 12/1/2010 Last visit: 10/13/2020 Posts: 316 Rating: (37)	Hi Ganesan_K, everything is right in your screen shots. If you sap bytes in a real value the value will be a other value. Please check the data type description in the help of the Simatic Manager --> Help --> Search"REAL"! A real value consists of asign(1 bit), a exponent(8 bits) and a mantisse(23 bits). In your screen shot the value in md24 is nearly the same than the other value, because you have nearly the same value like DB204.DBD262. The only different is the manntisse. Please see the help file to the real data type then you will understand! Or did I not understand your problem?
	Grüße / Regards / Salut / ciao / adiós / adieu / tchau Chilly Garfield
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8/17/2017 12:06 PM	Rate (0)
norouzi(2012) Advanced Member Joined: 11/14/2012 Last visit: 3/9/2021 Posts: 6 Rating: (2)	hi. if you use the "ROR" function with 16 bit , rotate the word1 and word2. example : this picture. Attachment pictures.zip (75 Downloads)
	Last edited by: Jen_Moderator at: 8/18/2017 11:16:11 AM Added all pictures as a Zip-File.
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