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CPU417 LEDs Flashing

Created by: sinhx at: 3/20/2016 8:04 AM (6 Replies)

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7 Entries

3/20/2016 8:04 AM	Rate (0)
sinhx Regular Member Joined: 1/12/2012 Last visit: 10/10/2024 Posts: 34 Rating: (0)	Dear Experts, I have been facing problem with CPU 417-5HT06-0AB0 configured as H Redundant System. Often all LEDs (including Fault & Status) start flashing and CPU stops program execution. I am using PCS7 v8.0 SP1 in my project. Please help.
	Regards, sinhx
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3/21/2016 1:07 PM	Rate (0)
Myst Silver Member Joined: 6/14/2006 Last visit: 10/15/2024 Posts: 301 Rating: (60)	Hi SDB, what is inside the diagnostic buffer in that case? Can you please upload the diagnostic buffer here? Are you running the most actual firmware in your PLC? Regards Myst

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3/21/2016 7:56 PM	Rate (0)
sinhx Regular Member Joined: 1/12/2012 Last visit: 10/10/2024 Posts: 34 Rating: (0)	Hello Myst, Thanks for your reply. Actually we have lost that particular message in diagnostic buffer as at the same time one DP slave had some issue with profibus connection and as a consequences all 3000 messages of diagnostic buffer was filled up with that particular message. Only thing I have observed in wincc system alarm is "loss of redundancy" message. What could be the reason?? That particular CPU has firmware version of 6.0.1 and in hardware configuration it is configured as v6.0
	Regards, sinhx
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3/22/2016 7:37 AM	Rate (2)
Myst Silver Member Joined: 6/14/2006 Last visit: 10/15/2024 Posts: 301 Rating: (60)	Hi SDB, as far as I have heard there has been some issue with a specific firmware version. Most actual version for your CPU is 6.0.5 Please update this. What was the problem in your specific case is hard to say without any diagnostic information. The firmware version and download link of all S7-400 PLC can you find here: https://support.industry.siemens.com/cs/de/en/view/40945038 Regards Myst

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This contribution was helpful to 2 thankful Users MicroMan sinhx

3/22/2016 10:51 AM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 10/24/2024 Posts: 1360 Rating: (232)	Hi, This issue have long history. Can be caused by many things. Even HW / Electrical issues can cause this. See this thread for clues: cpu 414-4h led light up
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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This contribution was helpful to 1 thankful Users sinhx

3/22/2016 7:27 PM	Rate (0)
sinhx Regular Member Joined: 1/12/2012 Last visit: 10/10/2024 Posts: 34 Rating: (0)	Thanks a lot to both of you. Hope upgrading to latest firmware will solve this issue. :-)
	Regards, sinhx
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8/12/2023 1:05 PM	Rate (0)
Rejjal Advanced Member Joined: 7/5/2009 Last visit: 6/27/2024 Posts: 76 Rating: (8)	Hello Alll I face same problem today, solved as the following: Power OFF CPU key moved from RUN to STOP Power ON Now stop LED blinking alone in 0.5 Hz CPU key moved back to RUN while Power ON Problem solved 🥳🥳🥳🥳 Good luck
	You can only go as far as you push
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