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S7 CPU as data logger

Created by: Prats at: 5/9/2012 6:07 PM (17 Replies)

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5/10/2012 9:00 AM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	My vote also is for using a simple VB application receiving temperatures (data) from PLC continuesly (build a TCP conncetion, where the CPU will be passive) and filling on the same time preapred DB. In this case CPU will be used like a intermediate divice which will read the temperature (without to store function) and really you can collect much more samples of temeprature (not only for a month). Best regards, Hristo Mihalev

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This contribution was helpful to 1 thankful Users playerslight

5/10/2012 2:41 PM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 7/14/2025 Posts: 672 Rating: (147)	Dear Prats, I am getting confused Where do you want to log the data now finally? PLC or PC ? Regards.
	Give us your feedback and show us your respect! We take our free time to support you with our knowledge and experience. If this post is helpfull to you kindly click on "Rate" or "Thank".
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5/10/2012 3:10 PM	Rate (0)
Amit_86 Platinum Member Joined: 3/18/2008 Last visit: 12/8/2023 Posts: 1750 Rating: (272)	TIBI68 Dear Prats, I am getting confused Where do you want to log the data now finally? PLC or PC ? Regards. Dear TIBI68, I thought he wants to log data in PLC itself and that's why i suggest to go with S7200. But i don't understand his requirement too.. it seems that he wants to log data in PC subject is misguiding. No Problem
	VANDE MATARAM.....
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5/10/2012 3:14 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	You should take care of 2 things - 1) What measurement frequency should this log support? 2) Can interruption occur between PLC and PC? If yes - you have to implement buffer in PLC as stated above. But please mention, that using MMC card for this purpose is not the best idea - it has it's own read-write cycles number.
Aret Posts: 2348 Rating: (265)
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5/10/2012 3:22 PM	Rate (0)
playerslight Posts: 1064 Rating: (72)	another point is how critical is the data ,what security does it require? does it need an encripted database
playerslight Posts: 1064 Rating: (72)
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5/10/2012 7:09 PM	Rate (0)
gre_m Posts: 947 Rating: (45)	data logging can in RAM plc, in MMC (SD) card. for data logging temperature you can also use element from Dallas semiconductor
gre_m Posts: 947 Rating: (45)
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5/20/2012 7:23 PM	Rate (0)
viktorpl Bronze Member Joined: 3/5/2008 Last visit: 6/11/2025 Posts: 12 Rating: (0)	Try this http://siemensplctoolboxlib.codeplex.com/

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8/17/2015 8:33 AM	Rate (0)
banconi Silver Member Joined: 3/19/2010 Last visit: 6/15/2025 Posts: 439 Rating: (12)	So, the more I search, the more I am convinced there is no way to use S7 CPU as data logger? None of the real solutions exist, to have the data samples buffered in PLC, and then read out in for example WinCC scada TagLogging system. All the solutions from this old topic are actually alternative solutions, but not the answer to the initial question. Even the Telecontrol option is very limited by the amount of data it is capable to store in PLC. If anybody has any decent solution for this question, please share it with me. I will be very happy to know that I am wrong. Best regards

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