Process Control System - QUADLOG
Transfer of control details
Thread Starter: Gabe Started: 6/11/2008 2:47 PM Replies: 1
6/11/2008, 2:47 PM
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Joined 11/20/2006
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We have a redundant Quadlog control system and would like to know the details of how the Quadlog system transfers control from primary to backup. How long does it take for instance? Is there anything we should be concerned about? etc
Thank you
Gabe Tosello
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6/30/2008, 8:24 PM
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Joined 12/20/2005
Last visit: 4/23/2013
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Gabe, I suggest you review the QUADLOG Safety Manual for information on fault detection: "The system responds to detected faults depending on architecture and user configuration. A 1oo2D architecture will degrade to 1oo1D when a fault is detected in one unit. A 1oo1D architecture may be configured to display the error condition or automatically shutdown when a fault is detected. (See section 6.7, Shutdown Logic) Automatic shutdown response time includes fault detection time plus one CCM scan unless the safety instrumented function has all I/O within one CDM module in which case the CDM module responds within 25 ms of fault detection time."
http://support.automation.siemens.com/WW/view/en/23447258
Regards,
RJP
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