10/7/2021 2:21 PM | |
Joined: 3/27/2021 Last visit: 3/7/2023 Posts: 6 Rating:
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Hello, I have three drives in control panel on 485 communication with PLC s7-200. The communication link in loop for all 3 drives, but facing BF error on single drive having CU 250S-2. Can somebody help to remove this error. Please refer the attachment and give solution. AttachmentBF error.avi (430 Downloads) |
10/7/2021 2:56 PM | |
Joined: 9/27/2006 Last visit: 7/14/2024 Posts: 12268 Rating:
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Hello nalagelalit; The screenshot is from the CU 250S-2PN operating manual: https://support.industry.siemens.com/cs/ww/en/view/109782994/140081780747 A flashing BF LED (rapid rate) indicates loss of communication with the IO controller (your PLC, in this situation). Understand this: when a diagnostic LED is active on a PN IO device, the only way to clear it is to resolve the fault that it is identifying. You cannot simpply bypass it. If there is a flashing LED on your CU, there myst be a similar BF LED active on the CPU. Please look at the CPU's diagnostic buffer, where all fault and error messages are logged. You should be able to locate messages that display information on the CU 250S-2PN fault (look for "Required OB 86" in the messages), they should help you understand the cause of the fault. If you need help to decypher the logged messages in the buffer, use the Save As.. button in the diagnostic buffer screen to generate a text file that you can attach here on the forum, we might be able to help you find a cause for the loss of communication on the CU. Hope this helps, |
Last edited by: dchartier at: 10/07/2021 14:57:28Last edited by: dchartier at: 10/08/2021 15:33:28 |
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12/21/2023 2:54 PM | |
Joined: 12/21/2023 Last visit: 2/22/2024 Posts: 1 Rating:
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on the PLC S7 200 output and input light should be on(green)? , |
Last edited by: K28 at: 12/21/2023 14:56:21 |
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