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| 9/11/2012 7:44 AM | |
Joined: 4/17/2009 Last visit: 7/23/2025 Posts: 28 Rating:
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Hi, In one of our project we want use as attached configuration are placed in rack-0 and rack-1. Rack-0 CPU is master and presently accessing all IO cards (including R-1), suppose master CPU fails (R-0) then Standby (R-1) will become active, in this scenario R-1 CPU will it be able to access all IO cards including R-0. Kind Regards, Guddu AttachmentCPU redundancy for centralized IO.pdf (485 Downloads) |
Last edited by: Guddu123 at: 9/11/2012 9:54 AM |
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| 9/11/2012 11:49 AM | |
Joined: 12/1/2009 Last visit: 7/14/2025 Posts: 672 Rating:
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Dear Guddu123 , As the Wizardalready stated, better use decentralised I/O's (ie. ET200M). Have a quick look into the manual of your CPU. Thereyou will find some configuration examples. |
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| 9/11/2012 2:24 PM | |
Joined: 4/24/2006 Last visit: 1/14/2026 Posts: 9105 Rating:
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Hello Guddu123, When you want to use centralized I/O: The master CPU[0] can only access I/O in Rack 0. and CPU[1] can only access I/O in rack 1 See this manual: SIMATIC Fault-tolerant systems S7-400H see chapter 13 Best regards, Wizard |
| 9/24/2012 2:50 PM | |
Joined: 10/7/2005 Last visit: 1/15/2026 Posts: 3054 Rating:
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Hello Guddu123
I doubt it, why sacrifice features and "force" you to put both CPU's into the same physical location? Have a look at How Siemens Safety Systems FMR Architecture Competing with TMR Systems! to find out more why you actually do want FO based sync between the CPU's instead of doing it via thebackplane. I hope this helps |
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