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Master CPU change to STOP mode when slave station down

5/5/2009 6:23 AM	Rate (0)
hanhdn Posts: 20 Rating: (0)	Dear all! Inour PLC system, it has a problem which i can not fixed, please help me to solve this problem. Master is CPU317-2DP, and with about 18 slaves is working in Profibus-DP network, which are from different manufacturers Siemens, ABB,.... I define I/O address for these slaves by PI (PIW, PID,..), and PQ (PQI, PQD,...). I also add OB82, OB85, OB86 for master CPU when IM module (do notuse Image address) down the master still run, but "BF" led is on. But, when the slave use PI or PQ address down, CPU change to "STOP" mode, I do not know why, please help me! Thanks you very much
hanhdn Posts: 20 Rating: (0)
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5/5/2009 6:54 AM	Rate (0)
Arunakat1 Posts: 217 Rating: (52)	Hi, I think you have to download OB 122 modular error (I/O acess error). The CPU goes to stop mode because it can’t access failed slave’s I/O. Best regards. Also see this link. /tf/WW/en/Posts/29044#top
Arunakat1 Posts: 217 Rating: (52)	Last edited by: Arunakat1 at: 5/5/2009 6:59 AM
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5/5/2009 7:13 AM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	Hello, You could find more info about OBs into follow FAQ: Which organization blocks do you need for error handling? Best regards Hristo Mihalev

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5/5/2009 11:21 AM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 8/31/2025 Posts: 4522 Rating: (843)	Hello, After you will create the OB that corresponds to the errors. In case of error occured the CPU will call the corresponding OB and the SF led will be ON. And the CPU will remain in Run mode.
	Ayman Elotaify
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