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DB pointer

Created by: gbs at: 8/11/2010 2:30 PM (2 Replies)

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8/11/2010 2:30 PM	Rate (0)
gbs Posts: 178 Rating: (5)	Hi all, What is the best way to transfer data at runtime? My problem is that whan using db pointers for each data transfer I have to open that db. eg: A #condition_1 JCN con2 L 410 T #pntrDB con2: A #condition_2 JCN trx L 411 T #pntrDB trx: OPN DB [#pntrDB] L DBB 0 T DB101.DBB 0 OPN DB [#pntrDB] L DBB 6 T DB101.DBB 18 Any ides? Cheers
gbs Posts: 178 Rating: (5)	Last edited by: gbs at: 8/11/2010 2:47 PM
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8/12/2010 3:53 AM	Rate (0)
billwest Posts: 510 Rating: (120)	From the Statement List for S7-300 and S7-400 manual: OPN <data block> opens a data block as a shared data block or as an instance data block. One shared data block and one instance data block can be open at the same time. Since there is no Close comand for the instruction, the Opened DB remains OPN. The second OPN is not required. billwest
billwest Posts: 510 Rating: (120)
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8/12/2010 4:47 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 1/12/2026 Posts: 3054 Rating: (1062)	gbs What is the best way to transfer data at runtime? My problem is that whan using db pointers for each data transfer I have to open that db. eg: A #condition_1 JCN con2 L 410 T #pntrDB con2: A #condition_2 JCN trx L 411 T #pntrDB trx: OPN DB [#pntrDB] L DBB 0 T DB101.DBB 0 OPN DB [#pntrDB] L DBB 6 T DB101.DBB 18 Hello gbs here's my take on possible solutions: 1.) As per billwest's suggestion (use DB1 and DB2 register to have two DB's open at the same time): L 410 A #condition_1 JCtrx L 411 A #condition_2 JCtrx . .moreconditions here . trx: T #pntrDB OPN DI [#pntrDB] // Open DBvia "DB2" register(aka "DI" register) L DIB 0 // Load Byte 0 from DB that is open via"DB2" register T DB101.DBB 0 // store value in Byte 0 of DB101 L DIB 6 // Load Byte6 from DB that is open via"DB2" register T DB101.DBB 18 // store value in Byte18 of DB101. .copy more variables . . NOTE: A fully qualified DB access (e.g. "T DB101.DBB0") willopen the the DB (DB101 in this example) viathe DB 1 register(see also HERE for more) 2.) If you only have two variables to transfer: L DB410.DBB 0 L DB410.DBB6 A #condition_1 JC trx L DB411.DBB 0 L DB411.DBB6 A #condition_2 JCtrx . .moreconditions here . trx:T DB101.DBB18 TAK // Swap accu1 and accu2 T DB101.DBB0 3.) If you have a continous range of values to transfertake look at SFC20 (you''ll have to create your own Source ANY pointer though as your Source DB is variable). I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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