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S7-1200 with KTP 400, system turned off for 2~3 days, it loses the time adjustment,

Created by: RVMolina at: 4/23/2014 1:27 AM (2 Replies)

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4/23/2014 1:27 AM	Rate (0)
RVMolina Posts: 1 Rating: (0)	Hello, I have a S7-1200 with KTP 400 comfort and use the plc as the clock master (synchronize the HMI with the the S7-1200 through area pointer). However, whenever I leave the system turned off for 2~3 days, it loses the time adjustment, and starts in 1970 or something like this... do you know what is going on? Can this be a hardware problem (the capacitor that supplies power to the clock), or is there some additional setting I need to make? Thanks in advance,
RVMolina Posts: 1 Rating: (0)	Last edited by: GrasserF at: 4/23/2014 7:41 AM new subject after splitting from /tf/WW/en/Posts/81797#top
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4/23/2014 11:59 AM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/28/2023 Posts: 4176 Rating: (1323)	Hi, The S7-1200, like stay in his system manual (http://support.automation.siemens.com/BR/view/en/36932465 apendix A), has a real time clock retention time of 20 days typ./12 days min. at 40 °C (maintenance-free Super Capacitor). If it doesn’t occurs, that means defect. However check first if the time of the S7-1200 was really lost or if you just have a sinchronization time problem (that is much more frequently, e.g. due configuration mistakes).
	Denilson Pegaia Siemens Industry Sector Technical Support
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11/28/2014 1:13 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4839 Rating: (123)	New question published bylaantjeis split to a separate thread with the subject S7-1200 datalog app. Best regards Min_Moderator

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