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Cpu 312C lost date and time

Created by: Roby at: 11/11/2013 11:50 AM (5 Replies)

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11/11/2013 11:50 AM	Rate (0)
Roby Silver Member Joined: 4/10/2006 Last visit: 9/25/2024 Posts: 930 Rating: (2)	Hallo i have one cpu 312C (catalog number 6ES7 312-5BF04) that lost date and time... It's possible? what could be the problem? Thank you Roby
	Setting of my PG M6 Siemens OS: Windows 10 Enterprise 22H2; Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz 2.59 GHz - 32G of RAM TIA15.1 Update 8; TIA17 Update 7; TIA18 Update 4 (i use normally)
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11/11/2013 12:15 PM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)	Hello, What do you mean by "lost" ? Normally the clock continues at the time of day it had when power was switched off. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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11/11/2013 12:59 PM	Rate (0)
Roby Silver Member Joined: 4/10/2006 Last visit: 9/25/2024 Posts: 930 Rating: (2)	Hello Marcjan, i set the time an data and after one/two days the time and data changes alone! what is possible?
	Last edited by: Roby at: 11/11/2013 1:00 PM Setting of my PG M6 Siemens OS: Windows 10 Enterprise 22H2; Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz 2.59 GHz - 32G of RAM TIA15.1 Update 8; TIA17 Update 7; TIA18 Update 4 (i use normally)
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11/11/2013 2:59 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 10/10/2024 Posts: 12285 Rating: (2685)	Hello Roby; The CPU 312C is the smallest of the Siemens S7-300 CPUs, and does not have a real-time clock in its hardware. See the technical data of this CPU, from Product support: https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=6ES73125BF040AB0&caller=view Notice that the time is not buffered with a software clock, and that when a power down happens the clock starts at the time that was registered when the PLC shut down .Look also at the expected time drift of up to 10 sec. per day. I suggest you build a time synchronizing function that you can call in OB 100 (at PLC startup) or manually so that the CPU's time is actualized when you restart it or when you need to correct the actual time on the PLC. You could follow the example and links provided in this FAQ (depending on the network you can use to connect your PC to the PLC): How do you configure time synchronization? Hope this helps, Daniel Chartier Attachment C:\Users\chard2\Pictures\CPU312C_software clock.jpg (157 Downloads)
	Last edited by: dchartier at: 11/11/2013 3:01 PM
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This contribution was helpful to 1 thankful Users Roby

11/11/2013 8:21 PM	Rate (0)
Roby Silver Member Joined: 4/10/2006 Last visit: 9/25/2024 Posts: 930 Rating: (2)	Hello dchartier, thank you for your help! Roby
	Setting of my PG M6 Siemens OS: Windows 10 Enterprise 22H2; Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz 2.59 GHz - 32G of RAM TIA15.1 Update 8; TIA17 Update 7; TIA18 Update 4 (i use normally)
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11/29/2013 9:48 AM	Rate (0)
O_Moderator Diamond Member Joined: 4/24/2009 Last visit: 8/20/2024 Posts: 2682 Rating: (135)	New question splitted to change the date and the time of the CPU from OP 177B? Best regards O_Moderator
	Tips&Tricks for the forum usage
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