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Fifo-register in S7-300

Created by: maartend at: 4/16/2009 8:55 AM (7 Replies)

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4/16/2009 8:55 AM	Rate (0)
maartend Posts: 5 Rating: (0)	Hi, Once a day i have to write values to a register, and after that i have to reset the value to zero. I have to store the values for 7 days, so we can look back 7 days in time. Can i create a fifo-register, and how...? Or do i really have to program it myself like this Value6 -> Value7 Value5 -> Value6 Value4 -> Value5 Value3 -> Value4 Value2 -> Value3 Value1 -> Value2 New Value-> Value 1 Can you help me please? Thanks in advance
maartend Posts: 5 Rating: (0)
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4/16/2009 12:22 PM	Rate (0)
Sydney Gold Member Joined: 1/4/2008 Last visit: 3/8/2023 Posts: 703 Rating: (96)	Hello, you can use prepared block from the Step7 Standard Library, S7-TI converting blocks: FC85 "FIFO". Use the online help for parametrizing. Regards Sydney

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4/16/2009 2:13 PM	Rate (1)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 4/12/2023 Posts: 10221 Rating: (1176)	Hello maartend, Also you could take a look at oscat.lib 3.04 Step 7 . More info about this library look at oscat.lib 3.04 Dokumentation. Best regards Hristo Mihalev

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4/16/2009 7:49 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 5/26/2023 Posts: 4184 Rating: (1342)	Hi, I have just now posted in tore topic a library to work with fifo: https://support.industry.siemens.com/tf/ww/en/posts/28953/
	Last edited by: Min_Moderator at: 10/6/2015 10:36:18 AM Edit link Denilson Pegaia Siemens Industry Sector Technical Support
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1/26/2010 1:40 PM	Rate (0)
Rush64 Posts: 4 Rating: (0)	Hi Pegaia, . I'm using your stacker V1.0which works very good except for the function Extract_At_Position. Everything works as long as I extract double words from position 1, but if i extract from position 2, the number of entries in buffer decreases with 1, but the data in the buffer doesn't shift. Ichanged line 444 in the scl source, from this"x1 := nr_DBD_to_move * 4 - 4;" to this"x1 := nr_DBD_to_move * 4;" Now it works fine, it looks like a copy and pasteproblem from the function insert. Best Regards Sonny
Rush64 Posts: 4 Rating: (0)
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2/10/2010 11:05 AM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 5/26/2023 Posts: 4184 Rating: (1342)	Program corrected
	Denilson Pegaia Siemens Industry Sector Technical Support
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10/11/2017 10:30 AM	Rate (0)
san1974 Regular Member Joined: 5/9/2015 Last visit: 4/27/2023 Posts: 5 Rating: (0)	HELLO, CAUSE OF LINK IS GIVING ERROR, CAN YOU PLZ SHARE ANY SAMOLE PROGRAM REGARDING FIFO. THANKS IN ADVANCE. UMENCHO Hello maartend, Also you could take a look at oscat.lib 3.04 Step 7 . More info about this library look at oscat.lib 3.04 Dokumentation. Best regards Hristo Mihalev

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10/11/2017 12:02 PM	Rate (0)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 5/31/2023 Posts: 4171 Rating: (643)	Just go to http://www.oscat.de/ and on the right hand side find a link to downloads.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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