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LEDs Flashing in S7 400

Created by: AutoGen_8622241 at: 8/17/2022 12:42 AM (5 Replies)

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6 Entries

8/17/2022 12:42 AM	Rate (0)
AutoGen_8622241 Posts: 1 Rating: (0)	Dear all, Yesterday my PLC entered the same state, I tried to turn it off and on but it didn't work. These days I will try to change the CPU slot or try it on some other rack to check if it works again. I will also check the condition of the cabinet ground and voltages. Is there any other recommendation on this? Thank you very much ------------------------------------------------------------------------------------------ Split from All LED Flashing in S7 400 414-3DP. Attachment S7-400-FAIL.avi (752 Downloads)
AutoGen_8622241 Posts: 1 Rating: (0)	Last edited by: Jen_Moderator at: 08/17/2022 13:41:06 New subject after splitting
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8/17/2022 8:58 AM	Rate (1)
s7-mencey Posts: 71 Rating: (29)	AutoGen_8622241 Dear all, Yesterday my PLC entered the same state, I tried to turn it off and on but it didn't work. These days I will try to change the CPU slot or try it on some other rack to check if it works again. I will also check the condition of the cabinet ground and voltages. Is there any other recommendation on this? Thank you very much Hello AutoGen_8622241, I recommend you to reinstall the PLC firmware and to use this opportunity to update it to the last version (if not done yet). Best regards, s7-mencey.
s7-mencey Posts: 71 Rating: (29)
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8/18/2022 4:22 PM	Rate (1)
Hazard_7 Bronze Member Joined: 5/30/2022 Last visit: 12/17/2025 Posts: 634 Rating: (103)	Hi AutoGen_8622241, The best thing to do is to perform a factory reset, then do a firmware update like s7-mencey says I also recommend that you review the following information provided by the S7-400 LEDS: https://support.industry.siemens.com/cs/ww/en/view/109803990/147935244555
	Last edited by: Hazard_7 at: 08/18/2022 16:25:16 If this information really helps, you could use the Rate function. Best Regards.
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8/19/2022 8:15 AM	Rate (0)
Michael K Gold Member Joined: 9/3/2008 Last visit: 12/9/2025 Posts: 943 Rating: (164)	Hi The description of the CPU LED is in the S7-400 manual here: https://support.industry.siemens.com/cs/ww/en/view/82478488/34700969611 Hope this helps.
	Michael
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8/20/2022 5:59 PM	Rate (0)
Ayman Elotaify Diamond Member Joined: 5/28/2008 Last visit: 12/22/2025 Posts: 4522 Rating: (843)	Hello, Please replace the CPU. if you couldn't exit from the "all led flashing" situation, you will not be able to communicate with the CPU. so, you will not be able to update the FW.
	Ayman Elotaify
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9/7/2022 8:44 AM	Rate (0)
gooda2011 Posts: 8 Rating: (0)	CHECK POWER SUPPLY.. DO MEMORY RESET.
gooda2011 Posts: 8 Rating: (0)
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