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Local Memory Indirect Adressing

Created by: maviizi at: 5/5/2012 10:21 AM (18 Replies)

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5/5/2012 12:14 PM	Rate (0)
Aret Posts: 2348 Rating: (248)	I like this idea Though i'm thinking about another implementation i won't ask you how exactly you did it - neither will share my implementation features - one of protection measures is to keep it's mechanism in secret.
Aret Posts: 2348 Rating: (248)
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5/5/2012 12:27 PM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 8/17/2020 Posts: 662 Rating: (139)	Aret I like this idea Though i'm thinking about another implementation i won't ask you how exactly you did it - neither will share my implementation features - one of protection measures is to keep it's mechanism in secret. There are lot of other way's, while the CPU has different memory areas you could pass parameters through. In addition to these software lock's there are hardware protection mechanismas wellto secure your investment, even if your softwareis getting copied. Regards.
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5/5/2012 12:32 PM	Rate (1)
Eastern Posts: 557 Rating: (64)	Hello, Write a logic in that way FC1 A M0.0 = L0.0 Call FC2 IN FC2 L DW#16#87000000 LAR1 A [AR1,P#0.0] = Will get result of m0.0 FC3 A M1.0 = L0.0 Call FC2 IN FC2 L DW#16#87000000 LAR1 A [AR1,P#0.0] = Will get result of m1.0 FC4 A M2.0 = L0.0 Call FC2 IN FC2 L DW#16#87000000 LAR1 A [AR1,P#0.0] = Will get result of m2.0 I hope you understood
Eastern Posts: 557 Rating: (64)
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5/5/2012 12:43 PM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 8/17/2020 Posts: 662 Rating: (139)	Dear Eastern , your exampledoes only work, if the two blocks are next to each other. What if an interrupt OB strikes in between? Regards.
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5/5/2012 1:01 PM	Rate (3)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 2/26/2021 Posts: 2864 Rating: (968)	Doesn't matter, each priority class OB maintains its own local data stack, so the interrupt will kick in, do its thing and maviizicode will continue to work as if nothing happened. Step 7 itself uses V memory (TEMP variables of the calling block) every time you usefor example a complex data type as an Input for an FC.
	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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This contribution was helpful to 2 thankful Users TIBI68 IZ ALJABRE-JORDAN

5/5/2012 1:07 PM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 8/17/2020 Posts: 662 Rating: (139)	Mensch fritz , why did you answered for him? Anyway, initiallythe software structure was and is still not revealed to us. So, if the two blocks are not next to each other, the suggested solution will not work. But the function in general was very nicely explained to us. Regards.
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5/5/2012 2:42 PM	Rate (0)
Marciano Bronze Member Joined: 4/30/2007 Last visit: 10/16/2020 Posts: 229 Rating: (20)	fritz Doesn't matter, each priority class OB maintains its own local data stack, so the interrupt will kick in, do its thing and maviizicode will continue to work as if nothing happened. Step 7 itself uses V memory (TEMP variables of the calling block) every time you usefor example a complex data type as an Input for an FC. Butif inside the interruption OB it is calling another FC or FB? Will still work?

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5/5/2012 2:56 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 2/26/2021 Posts: 2864 Rating: (968)	It sure will dear Marciano, since - as mentionedbefore - each priority class (i.e. each OB)has its own local data stack. When the interrupt is finished, the Block that was interrupted continues as if nothing happened (its local data and local dataof the Block from which it was called (aka V memory) are all still there).
	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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This contribution was helpful to 3 thankful Users Marciano TIBI68 IZ ALJABRE-JORDAN

4/20/2016 8:45 AM	Rate (0)
IZ ALJABRE-JORDAN Experienced Member Joined: 1/15/2015 Last visit: 2/4/2021 Posts: 66 Rating: (0)	Dear fritz, Can you please explain how to use the V stack,Because i can not find anything in the help about that. Thank you.

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