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What is the difference between symbolic and absolite addressing

Created by: Ingenious at: 6/11/2014 3:46 PM (10 Replies)

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6/11/2014 3:46 PM	Rate (0)
Ingenious Regular Member Joined: 8/22/2013 Last visit: 11/5/2024 Posts: 37 Rating: (0)	Hi, I'm new to TIA portal WinCC basic, The HMI tag can be defined as absolute and symbolic while creating an external HMI tag to connect it with PLC tag. what is the difference between symbolic and absolite addressing. Thanks,

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6/11/2014 4:25 PM	Rate (2)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 12/16/2024 Posts: 1361 Rating: (232)	Hi, Absolute addressing usually means you define the TAG for the phisical location of the variable for example DB200.DBD200 Symbolic addressing usually means you define a symbol for your variable and use this symbol later to reference your variable or TAG. Symbolic Tags usually FB IOs setted with O&M attribute vs absolute usually point for shared DBs. Cheers
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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This contribution was helpful to 1 thankful Users Ingenious

6/11/2014 6:12 PM	Rate (5)
William_B Posts: 5225 Rating: (1198)	Ingenious Hi, I'm new to TIA portal WinCC basic, The HMI tag can be defined as absolute and symbolic while creating an external HMI tag to connect it with PLC tag. what is the difference between symbolic and absolite addressing. Thanks, Hi. Thanks to MicroMan you have a good answer. Please allow me to add a fewthoughts to explain some implications. When using symbolic addressing the HMI request the data from the PLC via the symbol name. In theory at least.. Let us say Q0.0 is linked to "GATE". Later you have to move the output so that Q3.0 is now "GATE". The HMI does not mind the change because the HMI asks for the value of "GATE" and not Q0.0. Symbolic addressing is "slower" than absolute method. In real terms you will probably not see any difference. For S7-300 / S7-400 / ET200 the structure allow you to use either. In the S7-1200 and S7-1500 you have to notice how the DB is constructed. If a DB you use to link to the HMI is constructed in "optimized" way, then you MUST use symbolic. I hope this helps. Do ask us if something is unclear. w
William_B Posts: 5225 Rating: (1198)	Last edited by: William B. at: 6/11/2014 6:14 PM ..forgot to say "Hi" [smile]
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This contribution was helpful to 5 thankful Users Ingenious MicroMan zackk0 Alex1995 Anirudha999

6/11/2014 7:23 PM	Rate (0)
Ingenious Regular Member Joined: 8/22/2013 Last visit: 11/5/2024 Posts: 37 Rating: (0)	Thank you MicroMan and thank you William B. for making it more clear.
	Last edited by: Ingenious at: 6/11/2014 7:24 PM
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This contribution was helpful to 3 thankful Users S_Moderator William_B MicroMan

10/10/2023 3:09 PM	Rate (0)
yassine jgalli Posts: 7 Rating: (0)	William_B Hi. Thanks to MicroMan you have a good answer. Please allow me to add a fewthoughts to explain some implications. When using symbolic addressing the HMI request the data from the PLC via the symbol name. In theory at least.. Let us say Q0.0 is linked to "GATE". Later you have to move the output so that Q3.0 is now "GATE". The HMI does not mind the change because the HMI asks for the value of "GATE" and not Q0.0. Symbolic addressing is "slower" than absolute method. In real terms you will probably not see any difference. For S7-300 / S7-400 / ET200 the structure allow you to use either. In the S7-1200 and S7-1500 you have to notice how the DB is constructed. If a DB you use to link to the HMI is constructed in "optimized" way, then you MUST use symbolic. I hope this helps. Do ask us if something is unclear. w may i ask you to clarify more in this subject iam still buffuled, thanks
yassine jgalli Posts: 7 Rating: (0)
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10/10/2023 5:47 PM	Rate (0)
qwazee Platinum Member Joined: 3/30/2020 Last visit: 1/24/2025 Posts: 5025 Rating: (1029)	yassine jgalli may i ask you to clarify more in this subject iam still buffuled, thanks To avoid misunderstanding, could you please be specific what your questions is.
	Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
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This contribution was helpful to 1 thankful Users Jen_Moderator

10/16/2023 8:35 AM	Rate (0)
yassine jgalli Posts: 7 Rating: (0)	i didnt understand what did he mean in an 'optimized' way part. qwazee yassine jgalli may i ask you to clarify more in this subject iam still buffuled, thanks To avoid misunderstanding, could you please be specific what your questions
yassine jgalli Posts: 7 Rating: (0)	Last edited by: yassine jgalli at: 10/16/2023 08:35:48
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10/16/2023 9:20 AM	Rate (1)
qwazee Platinum Member Joined: 3/30/2020 Last visit: 1/24/2025 Posts: 5025 Rating: (1029)	yassine jgalli i didnt understand what did he mean in an 'optimized' way part. qwazee yassine jgalli may i ask you to clarify more in this subject iam still buffuled, thanks To avoid misunderstanding, could you please be specific what your questions The S7-1200 and S7-1500 has the option to have an optimized data structure. Note that this option is switched on by default, but can be switched off. The elements (tags) inside the optimized DB does not have an absolute address as we were used to for the S7-300 and S7-400. The compiler does not reveal any addressing for the optimized DB. The actual positions of the elements are dynamically moved around as more elements are added to an optimized DB. The only way to link a program or network partner to an element in the optimized DB, is to use a symbolic identification (symbolic addressing). What specifically in your use case brings doubt?
	Last edited by: qwazee at: 10/16/2023 09:22:48 Activities of this user is voluntary. There is no obligation or liability placed on this user. Though optional, your 'please' and 'thank you' is highly valued.
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This contribution was helpful to 1 thankful Users yassine jgalli

10/18/2023 9:54 AM	Rate (0)
yassine jgalli Posts: 7 Rating: (0)	thanks for your help, the word optimized puts me in doubts, thanks for you time qwazee yassine jgalli i didnt understand what did he mean in an 'optimized' way part. qwazee yassine jgalli may i ask you to clarify more in this subject iam still buffuled, thanks To avoid misunderstanding, could you please be specific what your questions The S7-1200 and S7-1500 has the option to have an optimized data structure. Note that this option is switched on by default, but can be switched off. The elements (tags) inside the optimized DB does not have an absolute address as we were used to for the S7-300 and S7-400. The compiler does not reveal any addressing for the optimized DB. The actual positions of the elements are dynamically moved around as more elements are added to an optimized DB. The only way to link a program or network partner to an element in the optimized DB, is to use a symbolic identification (symbolic addressing). What specifically in your use case brings doubt?
yassine jgalli Posts: 7 Rating: (0)
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This contribution was helpful to 1 thankful Users qwazee

7/8/2024 9:19 AM	Rate (0)
AutoGen_7540099 Posts: 5 Rating: (0)	thanks, please explan more about where symbolic tag to use.
AutoGen_7540099 Posts: 5 Rating: (0)
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