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CPU Fault in software redundancy

Created by: nookamon at: 7/28/2010 6:46 PM (2 Replies)

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7/28/2010 6:46 PM	Rate (0)
nookamon Posts: 8 Rating: (0)	Hello,I have a question. Now, I using 315-2DP(H) with software redundancy. OB80,82,85,86,87,122(Master) OB80,82,85,86,87,122(Redundancy) SET SET S M141.2 S M141.3 This is I want, if Master fault M141.2 is ON and if Redundancy fault M141.3 is ON.
nookamon Posts: 8 Rating: (0)	Last edited by: nookamon at: 7/28/2010 6:47 PM
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8/1/2010 10:37 AM	Rate (0)
Ben Rad Bronze Member Joined: 7/28/2010 Last visit: 8/31/2024 Posts: 184 Rating: (11)	Hi, Could you please be more specific in what it is that you are looking for? You have mentioned: "If Master fault M141.2 is ON and if Redundancy fault M141.3 is ON". Regards, Behnam www.sigmaprocess.ca

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8/1/2010 3:37 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 9/11/2024 Posts: 3020 Rating: (1054)	nookamon This is I want, if Master fault M141.2 is ON and if Redundancy fault M141.3 is ON. Hello nookamon I'm not too sure if I fully understand what you are after either. To begin with, what do you want to do with these bits once you set them? After all, Software redundancy means that the main program is NOT executed inStandby CPU. As also both CPU's have (or should have) the same redundancy relatedprogram anyhow and either can assume Master or Standby CPU role, I also can't see the need for generatingaseperate Master as well as a Standby CPUfault bit via the error OB's. Having said that, you can certainly find out which one is the current Master CPU and which one is the current Standby CPU via bit 0 and 1 in the predefined Status Word for Software Redundancy(The Status Word is in DBW 8 of the instance DB for FB 101 'SWR_ZYK'). Have a look at chapter 4 of the SIMATIC S7-300/S7-400 Software redundancy for SIMATIC S7 manual for more on these. I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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