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Step7 STL Pointer

Created by: ShMarat at: 1/30/2020 3:03 PM (4 Replies)

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1/30/2020 3:03 PM	Rate (0)
ShMarat Member Joined: 12/4/2015 Last visit: 4/30/2025 Posts: 3 Rating: (0)	Hello. Help me please. There is a program that I do not understand L "DB_Panel_Value".program_nr L "DB_Panel_Value".Program_compare ==I JC end1 // Programmnummer inkl. Offset in Pointer 1 schreiben L "DB_Panel_Value".program_nr L 66 *I L 66 +I SLD 3 L L#0 OD LAR1 // Pointer 2 auf TP170 Daten stellen L 0 SLD 3 L L#0 OD LAR2 // Schleife Datenьbertragung von Programm nach TP (33 Worte) L 33 lop1: T #loop1 OPN "DB_Speed_Programs" L DBW [AR1,P#0.0] T DBW [AR2,P#0.0] +AR1 P#2.0 +AR2 P#2.0 L #loop1 LOOP lop1 // Adressregister rьcksetzen L P#0.0 L L#0 LAR1 LAR2 end1: L "DB_Panel_Value".program_nr T "DB_Panel_Value".Program_compare ____________________________________________ L 0 ---? why load 0 and shift? what goes into Accu1 and Accu2 during these operations SLD 3 ---? L L#0 ---? OD ---? LAR2 ---? ____________________________________________ L P#0.0 ---? why download Pointer into Accu1. Can i not use this operation? L L#0 ---? LAR1 ---? LAR2 Thanks
	Last edited by: ShMarat at: 01/30/2020 15:06:59
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1/30/2020 3:39 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/1/2026 Posts: 36391 Rating: (4545)	What exactly do you not understand?

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1/30/2020 4:10 PM	Rate (0)
ShMarat Member Joined: 12/4/2015 Last visit: 4/30/2025 Posts: 3 Rating: (0)	L 0 ---? why load 0 and shift? what goes into Accu1 and Accu2 during these operations SLD 3 ---? L L#0 ---? OD ---? LAR2 ---? ____________________________________________ L P#0.0 ---? why download Pointer into Accu1. Can i not use this operation? L L#0 ---? LAR1 ---? LAR2 Thanks

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2/2/2020 8:10 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/1/2026 Posts: 6891 Rating: (1368)	Hello , section 1 L 0 ---? why load 0 and shift? what goes into Accu1 and Accu2 during these operations SLD 3 ---? L L#0 ---? OD ---? LAR2 ---? ____________________________________________ section 2 L P#0.0 ---? why download Pointer into Accu1. Can i not use this operation? L L#0 ---? LAR1 ---? LAR2 Thanks This pointer type is called "area-internal pointer".The basic format is "P#y.x" that y stands for byte number and x stands for the bit number.You can form this pointer dynamically in your program based on the S7 "area-internal pointer". In section 1 of your program , programmer tried to make the pointer manually in the most weird way.What is loaded in AR2 is equal to P#0.0. In section 2 , P#0.0 is equal to L#0 .Check the following video for more hints. I hope it helps, hdhosseini
	Demo Channel on Youtube
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This contribution was helpful to 1 thankful Users ShMarat

2/3/2020 2:59 AM	Rate (0)
ShMarat Member Joined: 12/4/2015 Last visit: 4/30/2025 Posts: 3 Rating: (0)	Thanks

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This contribution was helpful to 1 thankful Users hdhosseini

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