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PLC Primary Battery fault

Created by: KarolisL at: 9/18/2014 8:50 AM (7 Replies)

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9/18/2014 8:50 AM	Rate (0)
KarolisL Experienced Member Joined: 8/14/2013 Last visit: 7/9/2023 Posts: 47 Rating: (0)	Hello, CPU315-2DP gives Primary Battery fault. I don't see visible battery outside, maybe there is one inside the PLC? The code is like in tutorials: A #OB82_PRIM_BATT_FLT = "allarme_batteria_plc" Any idea for problem solution? Best regards, Karolis

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9/18/2014 8:54 AM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 12/15/2022 Posts: 5697 Rating: (708)	Hello, Please mention the partnumber of the CPU (6ES7 315xxxx xxxx) There are various 315 2 DP CPU's. 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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9/18/2014 9:00 AM	Rate (0)
KarolisL Experienced Member Joined: 8/14/2013 Last visit: 7/9/2023 Posts: 47 Rating: (0)	2AG10-0AB0

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9/18/2014 9:05 AM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 12/15/2022 Posts: 5697 Rating: (708)	Hello, That CPU has no battery, backup is done at MMC, my guess is that the program was original for older type of CPU and programmer forgot to remove these lines. Comment these lines and all should be o.k. 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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9/18/2014 9:15 AM	Rate (0)
KarolisL Experienced Member Joined: 8/14/2013 Last visit: 7/9/2023 Posts: 47 Rating: (0)	But the fault appears randomly, it isn't always on. Also the project is locked so I can't comment the lines

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9/18/2014 9:32 AM	Rate (0)
olloy Silver Member Joined: 8/27/2010 Last visit: 6/3/2022 Posts: 417 Rating: (37)	Hi! Usually, for back-up of modern CPUs MMC card is used, and for the internal clock supercapacitor (electric double-layer capacitor or ionistor) is used. It allows to have a back up of real-time clock value for up to 6 weeks after CPU power off (depends on environmental conditions). Actually there is a batery inside your CPU. In the attachmentis a picture. But as I understood, this battery is used for clock only and I do not know, if it gives diagnostics message in OB82. Attachment CPU_S7_315_2DP_AG10_42.JPG (112 Downloads)
	Last edited by: Min_Moderator at: 9/24/2014 11:25 AM Attach picture Last edited by: olloy at: 9/18/2014 9:43 AM Last edited by: olloy at: 9/18/2014 9:41 AM link added Last edited by: olloy at: 9/18/2014 9:33 AM
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This contribution was helpful to 1 thankful Users VVago

9/18/2014 10:11 AM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 12/15/2022 Posts: 5697 Rating: (708)	Hello, My guess (again) is that some other event is calling OB82, and because this battery event is programmed you get the message, can you check the diagnostic buffer for more events, you can save and share the buffer with the save as button. 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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This contribution was helpful to 1 thankful Users olloy

9/18/2014 10:16 AM	Rate (0)
KarolisL Experienced Member Joined: 8/14/2013 Last visit: 7/9/2023 Posts: 47 Rating: (0)	Ok, I will try as soon as possible Thanks for information Best regards, Karolis

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