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Indirect adressing with local var

Created by: got_fr at: 9/3/2012 4:03 PM (8 Replies)

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9/3/2012 4:03 PM	Rate (0)
got_fr Posts: 61 Rating: (1)	Hi, i have a var like mw0. in this var i am making a SHR. I want to test de bit of MW0 to see if it's to 1 or 0 this bit can be from 0 to 31. i would like to write someting like that : m[index].[x] i try readfield but i need an array. And i can't shift an array (can i?) any idea (if my question is clear) would be apreciate... Thank you
got_fr Posts: 61 Rating: (1)
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9/4/2012 1:17 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 11/29/2023 Posts: 4277 Rating: (1377)	Hi, In S7-300/400 you can do (in STL) something like "A M[MD0]" where MD0 represent the byte*8+bit. In S7-1200 you can use SCL.
	Denilson Pegaia Siemens Industry Sector Technical Support
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9/4/2012 2:04 PM	Rate (0)
got_fr Posts: 61 Rating: (1)	It seems it's not working in SCL. or i don't manage to find the right syntax... i try m[MD0] #m[MD0] "m"[MD0] nothings work... any idea of syntax?
got_fr Posts: 61 Rating: (1)
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9/4/2012 4:14 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 11/29/2023 Posts: 13945 Rating: (2277)	got_fr It seems it's not working in SCL. or i don't manage to find the right syntax... i try m[MD0] #m[MD0] "m"[MD0] nothings work... any idea of syntax? Maybe pass your memory tag to an FB or FC. Inside the FC/FB, the SCL (s7-1200) to set all bits to falselooks like this (yes, there are more efficient ways): [code]FOR #i := 0 TO 31 DO // Statement section #myarray[#i] := false; END_FOR;[/code]
	science guy
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9/5/2012 7:51 AM	Rate (0)
got_fr Posts: 61 Rating: (1)	but how do you pass the memory tag to the FC and "transform" it into an array? i'll miss somthing in you explanation?!
got_fr Posts: 61 Rating: (1)
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9/5/2012 12:01 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 11/29/2023 Posts: 4277 Rating: (1377)	Hi, with "AT" command: Delcarations: VAR1 as Word VAR2 AT Array[1..16] of bool
	Denilson Pegaia Siemens Industry Sector Technical Support
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9/5/2012 12:41 PM	Rate (0)
got_fr Posts: 61 Rating: (1)	Thank you... But sorry i still didn't manage... i try that : [code] FUNCTION "Bloc_2" : Void { S7_Optimized_Access := 'FALSE' } VERSION : 0.1 VAR_INPUT var1: BYTE; var2 AT var1: ARRAY[0..7] of BOOL; END_VAR BEGIN END_FUNCTION [/code] but when i generate the FC it returns an error telling me i can't superpose byte with array at this place... Where is th emistake. I am using step 7 basic V11 SP2. PS :sorry for the </p> ... they don't exist in the "real" code
got_fr Posts: 61 Rating: (1)	Last edited by: got_fr at: 9/5/2012 12:43 PM Last edited by: got_fr at: 9/5/2012 12:42 PM Last edited by: got_fr at: 9/5/2012 12:42 PM
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9/6/2012 2:58 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 11/29/2023 Posts: 13945 Rating: (2277)	Try adding your code to an FB instead of an FC. The help file shows where AT can be used.
	science guy
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9/6/2012 4:55 PM	Rate (0)
got_fr Posts: 61 Rating: (1)	Ok it works when i use an FB Thank you..!
got_fr Posts: 61 Rating: (1)
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