6/6/2011 12:56 PM | |
Joined: 3/21/2006 Last visit: 9/10/2024 Posts: 10228 Rating:
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Hello, Here in forum exist this kind of thread. I guess you already saw it. What do you think about it and all the options mentioned by our expert fritz there? DO or AO enabled while CPU goes to STOP. Best regards, Hristo Mihalev |
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6/6/2011 3:59 PM | |
Joined: 10/7/2005 Last visit: 9/11/2024 Posts: 3020 Rating:
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There is another way Pinux and it was also explained in the thread that UMENCHOpointed you too (who's initial requirements were a bit different from yours hence the CIR suggestion as the main one). SomeSiemens DQ (and AQ) cards do have the ability to substitute or keep last value upon CPU Stop. One example is the 6ES7322-8BF00-0AB0, but you will find more (easiest way is possibly todo a quick test config in HWconfig and see if the card allowsthese settingsin itsproperties). Question is why your customers wants (or needs) this. He may have good reasons, but if you for example findthat hisreasonis to open a particalur valve upon CPU stop, he's better off to install a "normally open" (aka "failt to open") actuator in it, as it will then also do so in cases of power failure. Food for thought anyhow and I hope this helps |
Last edited by: fritz at: 6/7/2011 12:07 AMfixed typos & grammar Cheers |
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