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S7-1200 How to copy REAL from one DB to four consecutive bytes in another DB?

Created by: Homeroid_BL at: 1/20/2011 12:39 PM (4 Replies)

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1/20/2011 12:39 PM	Rate (0)
Homeroid_BL Posts: 211 Rating: (6)	Hi all! Sorry for disturbing so often, but since S7-1200 has THE WORST DOCUMENTATION EVER, and it was released UNFINISHED, i must ask even this: I have a DB1 with 5 real variables in it. I have a DB2 with array of byes, 20 bytes in total. How to copy (in less then five MOVE instructions- that I know) DB1.DBD1 to 4 bytes in DB2, starting from byte 4 in DB2? And form DB2 four consecutive bytesto real in DB1? Thanks.
Homeroid_BL Posts: 211 Rating: (6)	Last edited by: Homeroid_BL at: 1/20/2011 12:49 PM
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1/20/2011 2:34 PM	Rate (1)
MrPaiva Silver Member Joined: 6/29/2010 Last visit: 10/27/2022 Posts: 112 Rating: (63)	Hi, Herean example for this. Good Luck.. Attachment Copy one Real to four Bytes.zip (1002 Downloads)
	Last edited by: MrPaiva at: 1/20/2011 2:36 PM
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This contribution was helpful to 1 thankful Users Homeroid_BL

1/20/2011 4:27 PM	Rate (0)
Homeroid_BL Posts: 211 Rating: (6)	Thanks, MrPavia, but I said I knew that already. Using this will cost me about 1kB of work memory for 10 reals. Is there some 'block' way to do it? Thanks anyway! Best regards.
Homeroid_BL Posts: 211 Rating: (6)
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1/24/2011 9:27 PM	Rate (0)
Jean-Francois Posts: 36 Rating: (0)	iM looking to do the same thing but with single integer...
Jean-Francois Posts: 36 Rating: (0)
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1/24/2011 11:17 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/21/2025 Posts: 15549 Rating: (2467)	Homeroid_BL Thanks, MrPavia, but I said I knew that already. Using this will cost me about 1kB of work memory for 10 reals. Is there some 'block' way to do it? Thanks anyway! Best regards. If you use the FieldRead / FieldWrite, you can index through properly constructed real arrays (non-symbolic only DBs) and set the values. I should think two loops will use much less memory than the long-hand method. Look on the FAQs, etc, for use of the fieldread/fieldwrite commands. It will require a little testing on your test PLC to make it work unless you are lucky or good (or both). If you do not have a test PLC on your desk, I urge you to pick one up to test things like this. I have mine driving a little KTP 6" color unit. Right now all it really does is toggle my welcome message to office visitors, but it has and will also run project test programming and screens. Worth the investment.
	science guy
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