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S7 410-5H Stop LED blinking

Created by: Surendhar_M at: 6/28/2025 4:41 AM (4 Replies)

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6/28/2025 4:41 AM	Rate (0)
Surendhar_M Advanced Member Joined: 2/4/2015 Last visit: 7/1/2025 Posts: 72 Rating: (0)	Hi all We have S7 410-5HX08-0AB0 v8.2.4 After power on, Stop is still blinking at 0.5Hz. Did memory reset. Still same condition. Kindly suggest the way forward. Same has been done in 2 CPUs same result. Regards Surendhar M

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6/28/2025 1:15 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/2/2025 Posts: 12396 Rating: (2717)	Hello Surendhar_M; Based on this manual for the S7 410-5H CPU, the PLC is asking you to initiate a memory reset. https://support.industry.siemens.com/cs/ca/en/view/109801828 Study section 7.4 of the same manual for a description of how to start a memory reset on a S7-410-5H. Hope this helps, Daniel Chartier Attachment CPU 410-5H memory reset request.jpg (96 Downloads)
	Last edited by: dchartier at: 06/28/2025 13:40:57
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6/29/2025 6:50 AM	Rate (0)
Surendhar_M Advanced Member Joined: 2/4/2015 Last visit: 7/1/2025 Posts: 72 Rating: (0)	Hi Sir, As per manual it's recommended to reset via ES. I have placed new CPU so tried to reset with the memory reset button. Turned off the power to CPU While turning on kept the button pressed. INTF lit after flashing. Released the reset button. But still stop led is blinking. Memory reset is not done??? Regards Surendhar M

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6/30/2025 4:15 PM	Rate (0)
Surendhar_M Advanced Member Joined: 2/4/2015 Last visit: 7/1/2025 Posts: 72 Rating: (0)	Hi Sir, We have not installed SEC (Siemesns System Expansion Card). Is it a must for CPU 410-5H to operate? Regards Surendhar M

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7/1/2025 12:18 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/2/2025 Posts: 12396 Rating: (2717)	Hello Surendhar_M; I believe Oreca's reply to this thread will provide the information you asked for: https://support.industry.siemens.com/forum/ca/en/posts/simatic-system-expansion-card-for-pcs7-project-with-98-process-objects/320865/?page=0&pageSize=10 A SEC card is always required on a S7-410-5H CPU. Hope this helps, Daniel Chartier

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