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cpu 417-4H stop->run problem

Created by: jjjinn at: 2/25/2020 8:06 AM (3 Replies)

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2/25/2020 8:06 AM	Rate (0)
jjjinn Advanced Member Joined: 7/12/2019 Last visit: 12/7/2022 Posts: 27 Rating: (0)	The stop led blinks when the cpu 417-4h is powered on. After 5-10 minutes, the run led turns on. The problem is that it takes too much time to change from stop led to run led. Why is this? I want to know the exact cause. Thank you for your reply.

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2/25/2020 8:19 AM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 9/3/2025 Posts: 4522 Rating: (843)	jjjinn The stop led blinks when the cpu 417-4h is powered on. After 5-10 minutes, the run led turns on. The problem is that it takes too much time to change from stop led to run led. Why is this? I want to know the exact cause. Thank you for your reply. Hello, This is normal in case your power supply battery is dead or not installed. It takes arround 10 minutes to be in run mode. Attachment battery.png (375 Downloads)
	Last edited by: Ayman Elotaify at: 02/25/2020 08:29:20 Ayman Elotaify
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2/25/2020 12:05 PM	Rate (0)
jjjinn Advanced Member Joined: 7/12/2019 Last visit: 12/7/2022 Posts: 27 Rating: (0)	Ayman Elotaify jjjinn The stop led blinks when the cpu 417-4h is powered on. After 5-10 minutes, the run led turns on. The problem is that it takes too much time to change from stop led to run led. Why is this? I want to know the exact cause. Thank you for your reply. Hello, This is normal in case your power supply battery is dead or not installed. It takes arround 10 minutes to be in run mode. Thanks for the answer. I want to use s7 400h only as single cpu, not redundancy. Is there any way to reduce the time to change to stop-> run led?

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2/25/2020 1:34 PM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 9/3/2025 Posts: 4522 Rating: (843)	jjjinn Ayman Elotaify jjjinn The stop led blinks when the cpu 417-4h is powered on. After 5-10 minutes, the run led turns on. The problem is that it takes too much time to change from stop led to run led. Why is this? I want to know the exact cause. Thank you for your reply. Hello, This is normal in case your power supply battery is dead or not installed. It takes arround 10 minutes to be in run mode. Thanks for the answer. I want to use s7 400h only as single cpu, not redundancy. Is there any way to reduce the time to change to stop-> run led? Hello, Yes. Insert SIEMENS backup batteries "6ES7971-0BA00" in your power supply. https://support.industry.siemens.com/cs/us/en/pv/6ES7971-0BA00/td?dl=en Hope this helps.
	Last edited by: Ayman Elotaify at: 02/25/2020 13:38:16 Ayman Elotaify
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