10/1/2020 8:43 AM | |
Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8175 Rating: (172) |
New question published by Tcmatik is split to a separate thread with the subject How can upgrade the firmware? . Best regards |
This contribution was helpful to1 thankful Users |
10/1/2020 10:00 AM | |
Joined: 2/22/2008 Last visit: 8/6/2024 Posts: 2698 Rating: (208) |
I have seen many solutions of problems, where other people said: "Not possible", e.g. calculation of square root, comparison of 32bit counter values and so on. Of course the Logo controller is not a fully PLC. The main problem may be the 16 bit integer restriction, but in this application there are solutions with cascaded counters. If all counter values are less than 32768, then you can calculate and compare them with the arithmetic operations. This is just the same as you calculate on a piece of paper and use separate digits. This methode will need many blocks, but it is possible, i think. The display format of values is not the best in the Logo, i know, but you can arrange something just to read the values without a pocket calculator, see attachment. If the Logo controllers are able to use the extended webserver, then you can create comfortable displays on a PC. There are also logic relays with 32-bit processing and better formatting options, but unfortunately not from Siemens. Regards, Scorp AttachmentkWh counter3a.zip (284 Downloads) |
10/1/2020 12:57 PM | |
Joined: 2/22/2008 Last visit: 8/6/2024 Posts: 2698 Rating: (208) |
Try the next version with calculation of difference, but test all conditions, before you use this program. The program is only tested in simulation on a PC. To complete my previous speakers, this program is only for monitoring to give you a chance for manually access to your solar and grid equipment. If your final result is an automatic system with all possibilities, then it would be better to add a fully PLC. Regards, Scorp P.S. If you don't know this function in simulation, just use the frequency mode for I3 and I4 to see the growing up of solar or grid energy. Then you can follow the differences and the different status signals, which one is higher. AttachmentkWh counter4.zip (287 Downloads) |
Last edited by: Scorp at: 10/01/2020 13:05:04 |
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This contribution was helpful to1 thankful Users |
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