1/23/2024 11:13 AM | |
Joined: 3/3/2012 Last visit: 5/24/2024 Posts: 10 Rating: (0) |
Dear Experts, We are using S7-400 H system (CPU: 6ES7 417-4HT14-0AB0 V4.5) for steel process industry, Today, unfortunate incident occurred reading failure of redundant CPU system where both CPU failed at same time. I have attached video for reference. Till now we have face issue of failure of one of CPU, but at that time other CPU works and take care of plant process. During downtime we revive failed CPU for redundant operation. This situation (failure of both CPUs) occurred first time since commissioning. Please suggest your opinion / experience for above situation - So that this type of situations can be avoided in future. Attachment417H_Both_CPU_Failed.mov (419 Downloads) |
1/23/2024 12:21 PM | |
Joined: 3/3/2012 Last visit: 5/24/2024 Posts: 10 Rating: (0) |
Dear Hazard_7, Thanks for your suggestions, When all lights are blinking, CPU is not able to communicate with PG - in this situation we cannot get diagnosis buffer. After power cycle, CPU stop led was continuously blinking (arround 12 to 14 minutes)...then CPU stop led was steady. (booting completed) - we tried make CPU in RUN mode via CPU switch - but CPU not going in run mode. As booting completed (Stop LED steady) - we extract diagnostic buffer from CPU -1 , (attached in this post) Regarding CPU firmware failure, we are following all standard guideline - ensuring proper earthing of CPU rack. - please elaborate firmware failure due to port (I mean physical port it it will be software port of microprocessor used inside CPU) This CPU was working since 2010 (13 years) - after that such problem came. AttachmentCPU1_23012024_1259.txt (438 Downloads) |
2/3/2024 4:22 PM | |
Joined: 5/28/2008 Last visit: 10/12/2024 Posts: 4515 Rating: (839) |
Hello, First tell us if this CPU has a safety program? What is the FW version of your CPU? Is it powered for more than 9 years without resetting? If yes, please reset it and tell us if it worked again or not. as per this FAQ: Important information on SIMATIC S7-400H safety programs during uninterrupted operation, it is written here:
And please always check that the latest FW is downloaded to the CPU. Download Operating System Updates V4.5H CPU412-3H / CPU414-4H / CPU414-4H PG / CPU417-4H |
Ayman Elotaify |
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