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Is it possible to have a redundant SLC 5/05? We're having a difficult time searching if it's possible, and up to now the answer is unclear. Can someone answer my question? Thanks...

And it is also possible to have a redundant power supply using SLC 5/05? Can someone please give a link that provides clarity to my question? Thanks a lot...

There was some kind of redundant SLC module but it only worked on 5/04s. It was pretty kludgey and I think it is no longer available.

Go with the ControlLogix system if you need redundancy. It works very well.

Required practical exposure on ControlLogix redundancy. Prolific is conducting training program on ControlLogix. Mail to pune@prolifictraining.com

There's the 'Backup Scanner Module' that allows you to build a redundant SLC system, with some dedicated communication channel between the cards to allow each PLC system to exchange data and detect the health of the other. Also allows shared IO. AB provide some example code, but after that its a case of writing a lot of your own code to make a solid redundant system. It works, but not that elegantly. For example, if there's any significant amount of data to keep in synch, a lot of block transfers are needed to move data across a backplane that was never really designed for that kind of work.

Like the other guy says, I'd use ControlLogix next time I had this kind of requirement.

Carl
www.westwoodtec.co.uk