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Regarding power shut off of S7-417-4H CPU Having RAM

6/8/2015 6:55 AM	Rate (0)
sacheen Experienced Member Joined: 4/8/2009 Last visit: 6/11/2025 Posts: 83 Rating: (1)	Hello to all, I have S7-417-4H CPU in redundant configuration with External RAM. In Power supply rack of Master & Standby CPU there are two batteries inserted. Also on each CPU there is no any fault indication regarding baterries (i.e. Batt 1F & Batt 2F LED Status). My question is if there is power shut off to Master & Standby PLC rack then is there any possibility to lost the PLC Program inside the CPU..?? Please suggest.. Thanks

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6/8/2015 7:30 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/5/2026 Posts: 6892 Rating: (1368)	Hello, Normally, when there is no alarm for batteries (1 and 2) on PS, it means currently batteries can support RAM and other required internal parts of CPU at the time of checking.But, for a real situation I prefer to change batteries (or use external power supply) to be sure there is enough power for demand even for a short time. I hope this helps, Hamid Hosseini
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6/8/2015 12:57 PM	Rate (0)
sacheen Experienced Member Joined: 4/8/2009 Last visit: 6/11/2025 Posts: 83 Rating: (1)	hello Hamid , Thank you for your valuable information.. Thanks

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This contribution was helpful to 1 thankful Users hdhosseini

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