5/11/2015 11:03 AM | |
Posts: 319 Rating: (9) |
Can you post a screen shot of diagnostic buffer ? |
5/14/2015 2:27 PM | |
Posts: 3 Rating: (0) |
wat is Sf & Bf2 Error |
5/14/2015 4:10 PM | |
Joined: 9/27/2006 Last visit: 9/22/2024 Posts: 12282 Rating: (2685)
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Hello; A diagnostic LED lights up when the CPU's OS detects an event that does not correspond to its normal operational settings. This could be related to a programming issue, a hardware defect or a lost communication with a remote Partner. The appearance of a diagnostic LED is combined with a message entry in the diagnostic buffer of the CPU, and possibly in the diagnostic buffer of the offending module or remote interface, in the case of a Profibus/Profinet error. These messages will log the events and give information on the source of the faults. Basically BF1 and BF2 (Bus Fault 1 and 2) indicate the loss of a remote IO station on Profibus or Profinet, the number indficates the CPU interface that is affected (no. 1 or no. 2). You should have a diagnostic LED light up on the lost module at the same time, which could help detect the source of the fault.. The SF (system fault) LED active means that a fault has been located on the CPU hardware or software. When it appears along with a BFx fault, it often means that your program is trying to access data from one of the faulty remote modules on the communications network, so this data is not available to the CPU. A (brief) descritpiton of the LEDs is available in the attached picture. This was extracted from the following manual: SIMATIC S7-300 CPU 31xC and CPU 31x: Technical specifications If you can have access to an online connection to the CPU (through Step 7, either V.5 or TIA Portal), you will be able to open the diagnostic buffer of the CPU to collect the messages logged there. These will be invaluable in determining the location of a fault, and in correcting it. See chapter 23 in the following manual: SIMATIC Programming with STEP 7 V5.5 Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 5/14/2015 6:20:40 PM |
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This contribution was helpful to1 thankful Users |
12/15/2015 3:01 PM | |
Posts: 111 Rating: (1) |
I am getting a BF fault on SMC module and my machine stop. Can any body support me quickly as I am on the machine |
12/15/2015 3:05 PM | |
Joined: 8/14/2014 Last visit: 4/5/2024 Posts: 144 Rating: (17) |
Diagnostic buffer screenshot please? |
This contribution was helpful to2 thankful Users |
3/30/2016 6:16 AM | |
Posts: 21 Rating: (0) |
in my system s7 300 the cpu is showing SF fault but in the IM module are ok . then what is the solution? |
6/27/2016 4:23 PM | |
Joined: 10/5/2015 Last visit: 7/2/2024 Posts: 1 Rating: (0) |
Hi guys, I have the same problem with random SF LED on CPU 315 2 DP. System worked flawlessly for 10 years and now starts to fail. We have checked power supply (replace with new one), replace all DO cards, replace IM365, replace CPU and the problem won't let go. If someone have an idea, we are here to listen. Thank you in advance. AttachmentVollert1.txt (879 Downloads) |
5/9/2017 4:14 PM | |
Posts: 1 Rating: (0) |
Hi, Can i know which I/P linked with which O/P. |
9/5/2018 6:48 PM | |
Posts: 1 Rating: (0) |
Please help, I tried MRES, clear/reset, power cycle and problem still there. BF2 LED blinking and SF is solid red.
AttachmentDiagnose.txt (751 Downloads) |
9/6/2018 2:51 AM | |
Posts: 14 Rating: (0) |
I also get this red light error once after placing an analog IM. What i did was, see pic. and problem solved |
9/7/2021 10:03 AM | |
Joined: 3/11/2019 Last visit: 6/24/2024 Posts: 1 Rating: (0) |
Hi i am facing a SF fault in the Digital Input module for one of the safety PLC. I am attaching the screen shot . |
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