6/18/2009 7:43 AM | |
Joined: 10/7/2005 Last visit: 10/18/2024 Posts: 3024 Rating: (1054) |
Dear Plectrotion you can in principal link your HMI/SCADA to read/write variables from an instance DB. At the end of the day, an instance DB is "just" another DB. Having said that, I would NOT do it nor recommend doing it as you can easily end up in "trouble". Example: You've created your FB's, even used them in a multinstance fashionand have started linking the instance DB tags to your SCADAsystem. You then realise that you need to change one of the FB's and add another IN or OUT or INOUT or STAT variable to it. No bigdrama you think, all you have to do is to update the block call and re-create the instance DBuntil you realise that you now have to re-link all SCADA tags as well since your addresses all shifted .... Having said that, if you work in a TIA enviroment (e.g. S7 and WinCC as your SCADA), you can link/mark FB's IN, OUT or INOUTs (butnot STATs) for usage byWinCC. Anyway, hope this helps Cheers fritz |
Cheers |
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This contribution was helpful to1 thankful Users |
6/18/2009 8:38 AM | |
Posts: 261 Rating: (42) |
Be careful about your inout parameter of the fb. Regards ddg |
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