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DB1.DBW5000 from DB1.DBD4998

Created by: GaJEnDrA D S at: 8/24/2011 5:25 AM (8 Replies)

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8/24/2011 5:25 AM	Rate (0)
GaJEnDrA D S Bronze Member Joined: 8/9/2011 Last visit: 11/1/2023 Posts: 324 Rating: (19)	Dear Sir, Can we access WORD from a DOUBLE In TIA portal V11 (like accesingDB1.DBW5000fromDB1. DBD4998 ) .Coz it says the variabe (DB1.DBW5000)hasn"t occupied the memory location. but its not the case in V10.5. Thanks
	Last edited by: GAJENDRADS at: 8/24/2011 5:26 AM "Any intelligent fool can make things bigger, more complex. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.":):)
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8/24/2011 12:27 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/24/2025 Posts: 4397 Rating: (1464)	Hi, if you create the DB with the property "simbolic access only" you could access a part of a variable directly. If you do not set this property, you can access the word from a dword, as soon bits and bytes too.
	Denilson Pegaia Siemens Industry Sector Technical Support
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8/24/2011 12:45 PM	Rate (0)
GaJEnDrA D S Bronze Member Joined: 8/9/2011 Last visit: 11/1/2023 Posts: 324 Rating: (19)	Hi sir. But the absolute address itself is not visible in symbolic access only. Can we ignore the warning regarding memory occupation with symbolic access disabled ? thanks
	"Any intelligent fool can make things bigger, more complex. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.":):)
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8/24/2011 1:34 PM	Rate (1)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/24/2025 Posts: 4397 Rating: (1464)	GAJENDRADS Hi sir. But the absolute address itself is not visible in symbolic access only. Can we ignore the warning regarding memory occupation with symbolic access disabled ? thanks Hi, You are right. When you use symbolic access only, you can not see the absolut address of the tag. So, you can not access part of the tag directly. You can access indirectly, coping it to an absolut address varible and from that make the desired partial addressing. In your case DBD 4998 = bytes 4998,4999,5000 and 5001; DBW5000 = bytes 5000 and 5001, that is ok. Can you place a printscreen of the warning.
	Last edited by: Pegaia at: 8/24/2011 1:35 PM Denilson Pegaia Siemens Industry Sector Technical Support
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8/24/2011 2:14 PM	Rate (1)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/24/2025 Posts: 15558 Rating: (2468)	GAJENDRADS Dear Sir, Can we access WORD from a DOUBLE In TIA portal V11 (like accesingDB1.DBW5000fromDB1. DBD4998 ) .Coz it says the variabe (DB1.DBW5000)hasn"t occupied the memory location. but its not the case in V10.5. Thanks I have many of these warning in my compilation reports. It basically says you are accessing memory directly rather than through a variable at that memory location. It is warning you that maybe you made a mistake. I do not like it, but understand it could be helpful if you typed in the address believing there should be a tag with that address.
	science guy
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8/25/2011 7:08 AM	Rate (0)
GaJEnDrA D S Bronze Member Joined: 8/9/2011 Last visit: 11/1/2023 Posts: 324 Rating: (19)	Hi. I have attached a file containing printscreen of warning message Attachment Address access problem.zip (748 Downloads)
	"Any intelligent fool can make things bigger, more complex. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.":):)
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8/25/2011 12:49 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/24/2025 Posts: 4397 Rating: (1464)	Hi, The version 11 perform some tests that early versions doesn't perform. I understood, that it is just a warning (not a error), that say that there is no symble to this variable. Just it.
	Denilson Pegaia Siemens Industry Sector Technical Support
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8/26/2011 7:17 AM	Rate (0)
GaJEnDrA D S Bronze Member Joined: 8/9/2011 Last visit: 11/1/2023 Posts: 324 Rating: (19)	ok thanks i got it
	"Any intelligent fool can make things bigger, more complex. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.":):)
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8/26/2011 7:20 AM	Rate (0)
GaJEnDrA D S Bronze Member Joined: 8/9/2011 Last visit: 11/1/2023 Posts: 324 Rating: (19)	Ya its useful in that sense But too much of warnings come after compiling...
	"Any intelligent fool can make things bigger, more complex. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction.":):)
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