Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

CPU-928A/ IM-318 Fault

Created by: S5-Eng at: 12/31/2009 7:49 PM (4 Replies)

Rating (2)

Thanks 1

5 Entries

12/31/2009 7:49 PM	Rate (0)
S5-Eng Posts: 3 Rating: (0)	We have a system consisting of one CC and one EU. The CPU is CPU-928A. IM-308 in the CC is connected to the IM-318 in the EU. The previous IM-318 had gone bad, so we put in a new IM-318 module, after setting up its switches, jumpers, and termination resistance. The problem is that when the system is powerd up, IM-318 Fault LED remains solid red. On the CPU in CC, the BASP LED remains solid red, and neither of the Stop/ Run LED on the CPU is active. Also the SI1 LED on the CPU is active, and does not allow to communicate with the PLC via PG. I have tried to reset the system many times (as per Siemens manual), but that does not appear to help. I took following steps, results also quoted: Changed the CPU-928A module with a spare: No effect observed Checked the cable b/w IM-308 and IM-318: Found in good health Took out the Serial connector from the IM-308 in CC : SI1 fault vanished, Upon powerup the CPU shows solid Stop indication,was ableto go online with the PG Any suggestion/ idea will be highly appreciated. regards
S5-Eng Posts: 3 Rating: (0)
Suggestion To thank Quote Answer

1/1/2010 1:36 PM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 12/20/2024 Posts: 3029 Rating: (1058)	Hello S5-Eng not too sure what could be wrong and you seemed to have done your homework. You do however say that "I have tried to reset the system many times (as per Siemens manual)". I wonder though if you did follow the IM308-318 restart procedure properly. Please have a look the startup chapter 3 of the 318/308 manuals, you can download these from the links below: 318-3UA11 Central Controller Interface Module 308-3UA12 Expansion Unit Interface Module Theyalso contain asection aboutError diagnostics which may help you further. 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.
Suggestion To thank Quote Answer

1/1/2010 3:26 PM	Rate (0)
S5-Eng Posts: 3 Rating: (0)	Fritz, Thanks for the reply... I already have the manuals that you referred to, and have gone through the manuals. Anyway, I am attaching for reference the uploaded PLC application backup and IStack/ BStack snapshots (attached Zip File). Any comments will be highly welcomed and appreciated. Thanks Attachment Backup.zip (379 Downloads)
S5-Eng Posts: 3 Rating: (0)	Last edited by: S5-Eng at: 1/1/2010 3:27 PM
Suggestion To thank Quote Answer

1/4/2010 1:27 PM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 12/20/2024 Posts: 3029 Rating: (1058)	Hello again S5-Eng alright, let's have a look at some of the other observations you made and allowme to ask some more questions (you supplied documents - while helpful - do unfortunately not contain any further clues to what could be wrong). You said that "The previous IM-318 had gone bad". Q1: Do you know what lead to it's failure (e.g. did it happen after a power surge or failure in your plant etc. If so it could have lead to failures of other cards/components)? Q2: Do you have a spare IM308 (if the IM318 failed due to external influences it may have also taken out its counterpart IM308)? You also said that "The problem is that when the system is powerd up, IM-318 Fault LED remains solid red. On the CPU in CC, the BASP LED remains solid red, and neither of the Stop/ Run LED on the CPU is active. Also the SI1 LED on the CPU is active, and does not allow to communicate with the PLC via PG." This CPU state (SI1 & BASP LED lit, RUN & STOP LED off) indicate that the CPU is still in the Initial Start or program check state(which should only last a couple of seconds or so). Since you CPU seems to be "stuck" in this this state I wonder if perhaps your spare IM318 is faulty too and the cause for this so the next set of questions is: Q3: Do you have the same "stuck" startup state when the original faulty IM318 is installed? Q4: Do you have another spare IM318? Last but not least you said that "Took out the Serial connector from the IM-308 in CC* :SI1 fault vanished" Q5:* Please confirm that this is just a typing mistake and clarify which cable you took out from which IM (the IM308 should be located in the EU and NOT in the CC). I hope the answers to the questions will help us to help you further.
	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.
Suggestion To thank Quote Answer

1/4/2010 7:26 PM	Rate (0)
S5-Eng Posts: 3 Rating: (0)	Thanks for the reply, answers to some of your questions follow: I dont know the cause thatof the fault inIM-318. I was just informedby the maintenance engineer that they had the fault, and IM-318, somehow, failed to power up. Then thet replaced it with a new one. That was not a typo mistake, IM-308 is located in the CC (the same rack in which CPU-928) is installed. The good news is that today I arranged the IM-308 from a nearby site (it was not available in our stock), and replaced it. That caused the fault on the IM-318, and CPU-928 to clear, and allowed the CPU to go in to RUN mode. Thanks for the help Cheers!!!
S5-Eng Posts: 3 Rating: (0)
Suggestion To thank Quote Answer
This contribution was helpful to 1 thankful Users fritz

|

Share this page:

Share this page on...

Follow us on