6/11/2014 6:12 PM | |
Posts: 5225 Rating:
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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 |
Last edited by: William B. at: 6/11/2014 6:14 PM..forgot to say "Hi" [smile] |
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5 thankful Users |
6/11/2014 7:23 PM | |
Joined: 8/22/2013 Last visit: 4/21/2024 Posts: 36 Rating:
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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 |
10/10/2023 3:09 PM | |
Joined: 5/18/2023 Last visit: 11/11/2023 Posts: 7 Rating:
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may i ask you to clarify more in this subject iam still buffuled, thanks |
7/8/2024 9:19 AM | |
Joined: 7/8/2024 Last visit: 8/15/2024 Posts: 2 Rating:
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thanks, please explan more about where symbolic tag to use. |
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