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Strings in Data Log Create

Created by: Tiago Candeias at: 2/22/2012 3:58 PM (8 Replies)

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2/22/2012 3:58 PM	Rate (0)
Tiago Candeias Posts: 5 Rating: (0)	DGH Just a quick question when I create a datalog file in the s7-1200, How do I log a real value to display only 4.41 & not 4.41E+00 in the csv file? Thanks for your Time. Hi Pegaia! I have a similar problem with Strings in Data Log Create, i will describe: - I already have tested Data Log Create with the INT Data Parameter, and works fine, but when i use String[4]it give me error 8C20, and i cannot create the CSV. - When i use String (undifined size), the program creates the CSV with sucess, but it only shows the last register line, the old lines desapeears. Can you give me some tips please? Thanks, TC Attachment Data_log_problem.JPG (964 Downloads)
Tiago Candeias Posts: 5 Rating: (0)	Last edited by: O_Moderator at: 2/23/2012 10:55 AM new subject after splitting from /tf/WW/en/Posts/59398#top
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2/24/2012 11:21 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/4/2024 Posts: 4349 Rating: (1446)	Hi, I suggest you to create this DB not as "only simbolic" and use a absolut adress pointer (for example, P#db1.dbx0.0 byte 6)
	Denilson Pegaia Siemens Industry Sector Technical Support
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2/24/2012 8:06 PM	Rate (0)
Tiago Candeias Posts: 5 Rating: (0)	Hi Pegaia, Thanks for your answer. I tested as you said, and now i can create the CSV and write line in the CSV. But now i cannot understand the meaning of the Cells in the CSV. For example: If i put these values in the Data (P#DB19.DBX520.0 BYTE 34) Data Struct 520.0 OF String[4] 0.0 'ddee' CP String[4] 6.0 'abcd' MM Int 12.0 3 Prod1 DInt 14.0 4 Prod2 DInt 18.0 0 Prod3 DInt 22.0 0 Prod4 DInt 26.0 0 Prod5 DInt 30.0 0 And in the CSV i got this: 2, 2/24/2012,18:04:30, 4, 4, 100, 100, 101, 101, 4, 4, 97, 98, 99, 100, 4, 210, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 For data logger i believe that it's not possible use absolut adress, because we loose the Data Format, the program writes all the data as Bytes. Can you give me some tips for work with strings in Data logger? Thanks, TC Attachment Data Logger.JPG (656 Downloads)
Tiago Candeias Posts: 5 Rating: (0)
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2/24/2012 9:41 PM	Rate (1)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 10/4/2024 Posts: 15264 Rating: (2422)	The data log FB/FC you created can accept string[4] into a string, write the string (with success!) and excel can handle it just fine. Maybe I am misunderstanding something.
	science guy
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2/27/2012 11:16 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/4/2024 Posts: 4349 Rating: (1446)	Hi, When the s7-1200 manual descript the DATA LOG variable “DATA” it says that “Structure data types are limited to a single nesting level”. Maybe (?) it seems that the Stings into a struct should considered as two levels; maybe (?) it is a bug... First of all, I suggest you open a support request (open right on this site) and ask to experts what means “8C20” (once it is not in the manual). Please, post what they answer to us. Then, try to log just the string variable. Place it outside structs and look if it works. If yes, then you have two ways: 1 – concact all information in a string. 2 – Maintain the suggestion of use absolute address, and merge the bytes (converting it from byte numbers to char / Dint) by a Excel macro, for example.
	Last edited by: Pegaia at: 2/27/2012 11:17 AM Denilson Pegaia Siemens Industry Sector Technical Support
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2/27/2012 11:57 AM	Rate (0)
Tiago Candeias Posts: 5 Rating: (0)	Hi, Thanks, for your answer. In atachment, i'll send you a a program with a example of creation CSV's with 3 different Data Sctruts (PLC1_DB, PLC2_DB, PLC3_DB), for simulate 3 new Data Log Create. I also send you the CSV's, after Write 3 lines. Data Struct "PLC1_DB": OF Int 0 False True CP Int 0 False True CM Int 0 False True Prod1 DInt 0 False True Prod2 DInt 0 False True Prod3 DInt 0 False True Prod4 DInt 0 False True Prod5 DInt 0 False True Data Struct "PLC2_DB": Int1 String False True Int2 String False True Int3 Int 0 False True Int4 Int 0 False True Int5 Int 0 False True Int6 Int 0 False True Int7 Int 0 False True Int8 Int 0 False True Data Struct "PLC3_DB": Int1 String[20] False True Int2 String[20] False True Int3 Int 0 False True Int4 Int 0 False True Int5 Int 0 False True Int6 Int 0 False True Int7 Int 0 False True Int8 Int 0 False True I can create PLC1 and PLC2 CSV's with sucess. But in the case of PLC3 i got the 8C20 error ("String with length specification other than 254 used"), and it's not possible to create. If i write 3 new lines in PLC1 and PLC2, i got diferents results: - In the case of PLC1, everything it's ok (i can create the 3 new lines with sucess); - In the case of PLC2, when i open the CSV, i just have the last register line. My doubt it's how can i use String data, with limit size of characters (example: String[20]), and save all the register lines in the CSV? Attachment CSV_test.zip (255 Downloads)
Tiago Candeias Posts: 5 Rating: (0)
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2/27/2012 12:07 PM	Rate (0)
Tiago Candeias Posts: 5 Rating: (0)	Hi Pegaia, Thanks for your answer, We were "posting" here at the same time, and i didn't read your last post before i wrote the my last post. I'll report this again, and whait for an answer. After that, i told you the answer of the support. Regards, Tiago Candeias
Tiago Candeias Posts: 5 Rating: (0)
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5/4/2016 2:31 PM	Rate (0)
Myller Constante Posts: 1 Rating: (0)	Hi, I have an S7-1200 PLC, CPU1215 and HMI KTP400 Comfort and need to enter the Historical Data HMI a variable of type "String", whict comes from a PLC DB, but when I insert the Historical Data does not accept. What should I do to put the variable "String" in my Data Log?
Myller Constante Posts: 1 Rating: (0)	Last edited by: Myller Constante at: 5/4/2016 6:25:48 PM
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5/4/2016 3:39 PM	Rate (1)
Robster Gold Expert Joined: 5/28/2008 Last visit: 9/11/2024 Posts: 1343 Rating: (141)	Please translate into english, that we are able to help. thx Myller Constante Olá, Possuo um PLC S7-1200, CPU1215 e uma IHM KTP400 comfort e preciso inserir no historical data da IHM uma variavél do tipo "String", que vem de um DB do PLC, porém quando insiro o historical data não aceita. O que devo fazer para colocar a variavel "String" em meu Data Log ?

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