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| 3/8/2009 3:38 PM | |
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Posts: 103 Rating:
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how are you all, |
| 3/8/2009 5:14 PM | |
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Posts: 557 Rating:
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hi Fail-safe automation systems (F-systems) are used in systems with stricter safety requirements. F-systems are used to control processes with a safe state that can be achieved immediately after shutdown. That is, F-systems control processes in which an immediate shutdown does not endanger humans or the environment. |
| 3/8/2009 5:24 PM | |
Joined: 9/27/2006 Last visit: 11/18/2024 Posts: 12296 Rating:
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Hello Ahmed; As a very basic definition, -a fault-tolerant system (also known as High-availability system, as in S7-400H) is designed to reduce production loss by using a pair of redundant processors in a Primary/Standby mode. Its main objective is to minimize downtime. Redundancy can be used in various configurations, and at various levels (controller, I/O, communications, cables....) depending on the required protection required. Here you will have information on the S7-400H system, and basic information: http://support.automation.siemens.com/WW/view/en/1186523 - a fail-safe system (Fail-safe as in S7-400F) is designed to protect humanlife (and injury), the environment and manufacturing investments by determining safe operating modes, and bringing the control; system to a "safe" STOP mode in case the situation is evaluated as unsafe. Again, many configurations and levels can be configured, depending on the standardized safety level required (often determined by SIL analysis). Here you can find a manual on Safety Engineering in S7 Systems, for more information: http://support.automation.siemens.com/WW/view/en/12490443 In Siemens' world, you can have a mixture of both concepts, as in S7-400HF systems. Hope this helps, Daniel Chartier |
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| 3/10/2009 10:37 AM | |
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Posts: 103 Rating:
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now i can understand the issue thank you alot for your response |
| 6/22/2009 1:29 PM | |
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Posts: 130 Rating:
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Hi admed, First lets discuss about Fault Tolerance: It is defined as the property that enables the system to continue operating properly even in the event of failure (one or more faults) of some of its components. If its operating quality decreases at all, the decrease is proportional to the severity of the failure Fault-tolerance is particularly sought-after in high-availability or life-critical systems The basic characteristics of fault tolerance require:
FAIL SAFE: |
| 7/8/2009 3:13 PM | |
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Posts: 20 Rating:
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