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S7-1200 Indirect Addressing

Created by: Hotz 70 at: 8/13/2013 9:44 AM (8 Replies)

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8/13/2013 9:44 AM	Rate (0)
Hotz 70 Posts: 16 Rating: (0)	Dear All... I would like to make a program using indirect addressing using S7 1200, but i still confuse to realize it to program because i just still learn about indirect addressing in S7 1200. I have an input in block function. And this input indicate Data Block Number that i would use to store data.So if i fill the input with number 100, it means i will store the data in DB100. DBX... If i fill the input with 101, it means i will store the data in Db100.DBX... etc. So the point is how to make my input (number) be the number of DB that will i use to store my data. Anybody could give me an example for this application? Thank you & Best Regards
Hotz 70 Posts: 16 Rating: (0)
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8/13/2013 10:23 AM	Rate (0)
Mako2 Experienced Member Joined: 11/12/2012 Last visit: 11/22/2023 Posts: 36 Rating: (3)	Hello In FBD/LAD You could useFieldRead and FieldWrite instructions. See S7-1200 Programmable controller System Manual for details: http://support.automation.siemens.com/WW/view/en/36932465 Best regards

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8/13/2013 11:02 AM	Rate (0)
Nelliyan randy Posts: 461 Rating: (29)	I will simply do this via move,(can be done in many ways) for ex: ID0( i0.0 to i3.7) move to DBXX.DBD0( dbx0.0 to dbx3.7) .. u can C the individual ip status when u split this dbd to dbx..Hope i am right..The ip status will be updated in the db also... regards, Nelliyan.G
Nelliyan randy Posts: 461 Rating: (29)	Last edited by: Nelliyan randy at: 8/13/2013 11:03 AM
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8/13/2013 11:10 AM	Rate (0)
Hotz 70 Posts: 16 Rating: (0)	Dear Nelliyan Randy, My input data will use to change the data block number as my example before, if i fill the input with 100 it means that i will store my data in db100, if i fill the input with 101 it means that i will store my data in db 101 etc. So my input is used to change the data block number, not the specified memory of DB DBX, DBB, DBW,or DBD. Maybe you can give me solution. Thank you
Hotz 70 Posts: 16 Rating: (0)
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8/13/2013 11:15 AM	Rate (0)
Nelliyan randy Posts: 461 Rating: (29)	Then use compare == instruction...under basic instruction tree if ip data == 100 move 100 to db100.xxx If ip data == 101 move 101 t odb101.xxx
Nelliyan randy Posts: 461 Rating: (29)	Last edited by: Nelliyan randy at: 8/13/2013 11:16 AM
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8/13/2013 3:49 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/1/2023 Posts: 13953 Rating: (2277)	Nelliyan randy Then use compare == instruction...under basic instruction tree if ip data == 100 move 100 to db100.xxx If ip data == 101 move 101 t odb101.xxx As we all realize, this solution is only if your only job is maintaining this one system for such a specific solution. A more generic approach might be to use the poke command (SCL only)from the basic move instruction set. Using the Poke command, you can specify the exact DB #, offset, and length. During development of your code, just be aware you may corrupt your DB, so maybe put a check in the code to read values from the DB before and after just to be sure it executed correctly. Once the code operates as needed, the checks can be commented out.
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8/14/2013 6:47 AM	Rate (0)
Nelliyan randy Posts: 461 Rating: (29)	huggy_d1 Nelliyan randy Then use compare == instruction...under basic instruction tree if ip data == 100 move 100 to db100.xxx If ip data == 101 move 101 t odb101.xxx As we all realize, this solution is only if your only job is maintaining this one system for such a specific solution. A more generic approach might be to use the poke command (SCL only)from the basic move instruction set. Thank u, i will keep it in mind next time ( the problem is i never got chance to work in SCLalways lad or fbd) Regards, Nelliyan.G
Nelliyan randy Posts: 461 Rating: (29)
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8/14/2013 9:42 AM	Rate (0)
BryanG2001 Posts: 113 Rating: (22)	See this thread: /tf/WW/en/Posts/93864
BryanG2001 Posts: 113 Rating: (22)
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9/27/2013 10:57 AM	Rate (0)
O_Moderator Diamond Member Joined: 4/24/2009 Last visit: 11/23/2023 Posts: 2683 Rating: (135)	New question splitted to write from DB15.DBW20 to DB15.DBW22 by increasing offset number Best regards O_Moderator
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