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S7-200 LOCAL VARIABILE TABLE ALTERED

11/11/2008 4:24 PM	Rate (0)
ionut.b Bronze Member Joined: 1/17/2007 Last visit: 10/6/2020 Posts: 289 Rating: (3)	Isit possible thatthe memory locations allocated by the local variables in one suburutine to bealtered by other variablesfrom the main program? Is there a way to avoid this? No mather what I do some variables declared in local table aren't keeping their state. For the moment the only solutin I have is to use inside a suurutine, variables declarated in the main program. Thank you.

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11/12/2008 4:16 PM	Rate (0)
Robster Gold Member Joined: 5/28/2008 Last visit: 9/5/2025 Posts: 1344 Rating: (141)	Hi, local variables are only valid for one cycle. After that, it can be possible that they will be overwrite by other values. Use local variables only, if you don't want to save the value for the next cycle. Otherwise use global variables defined in a symbol table. If you have a subroutine that gives you values on an output use also global variables in it. But in the end of the subroutine transfer the value from global variable into the local variable for the output. So you make sure, that you have always the correct value. best regards

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11/12/2008 4:42 PM	Rate (0)
ionut.b Bronze Member Joined: 1/17/2007 Last visit: 10/6/2020 Posts: 289 Rating: (3)	I understand what you mean. Thank you for the tip.

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11/14/2008 1:16 PM	Rate (0)
Robster Gold Member Joined: 5/28/2008 Last visit: 9/5/2025 Posts: 1344 Rating: (141)	no problem

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