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All LED Flashing on S7 1200 CPU

Created by: Fitzg at: 2/11/2019 12:37 PM (8 Replies)

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2/11/2019 12:37 PM	Rate (0)
Fitzg Member Joined: 7/26/2018 Last visit: 10/31/2025 Posts: 3 Rating: (0)	Dear Expert I found my PLC stop working , all LED (Run/Stop, Error, and Maint) continuously flashing. I also cannot connect to my PLC via accessible device. how can I solve this problem? Thanks and best regards, Fitzg

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2/11/2019 12:43 PM	Rate (0)
ChristophD Grandmaster Joined: 5/12/2006 Last visit: 12/19/2025 Posts: 22816 Rating: (3073)	Hello, do you have a memory card in the PLC? Regards Christoph

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2/12/2019 8:28 AM	Rate (0)
Fitzg Member Joined: 7/26/2018 Last visit: 10/31/2025 Posts: 3 Rating: (0)	Hello memory card not installed in our PLC. hereby attached a picture of PLC Thanks and best regards, Fitzg Attachment S7 1200 CPU.jpg (718 Downloads)

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2/12/2019 8:51 AM	Rate (0)
#dP Posts: 2826 Rating: (692)	The external cards are also in error. It looks like a firmware update that went wrong. Disconnect all the external cards. Do a proper power shutdown and power-up again. Follow with attempting to connect with the PLC again. Do you have an empty memory card?
#dP Posts: 2826 Rating: (692)
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2/13/2019 11:02 AM	Rate (0)
Fitzg Member Joined: 7/26/2018 Last visit: 10/31/2025 Posts: 3 Rating: (0)	Hello there is no memory card on CPU, it's possible CPU defective cause of firmware or? Thanks and best regards, Fitzg

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6/12/2019 1:21 PM	Rate (0)
Stan_707 Regular Member Joined: 12/13/2018 Last visit: 8/12/2025 Posts: 2 Rating: (0)	HI, Have the same problem, I have download latest firmware from Siemens and copy it over to 256MB Siemens MMC, Next i have power down PLC insert card and power up but those leds still flashing the same, Nothing happening, is this mean PLC dead ? Regards Stan

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6/13/2019 6:03 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 12/19/2025 Posts: 16321 Rating: (2520)	Odds the PLC is dead is nearly 100%. Stan_707 HI, Have the same problem, I have download latest firmware from Siemens and copy it over to 256MB Siemens MMC, Next i have power down PLC insert card and power up but those leds still flashing the same, Nothing happening, is this mean PLC dead ? Regards Stan
	science guy
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10/15/2019 1:45 PM	Rate (0)
azam99 Posts: 1 Rating: (0)	I have same problem ...please give me solution..
azam99 Posts: 1 Rating: (0)
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10/16/2019 12:41 AM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 12/19/2025 Posts: 16321 Rating: (2520)	How can you be certain it is the exact same problem? What have you tried? What happens when you access the plc via "online access" in the project tree? What's in the diagnostics buffer? Does the PLC have a name and ip address? What happened between when the problem did not exist and now? azam99 I have same problem ...please give me solution..
	science guy
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