2/12/2020 10:56 AM | |
Posts: 5 Rating: (1) |
Hello, I am doing some research on the S7-1500 system limits regarding OPC-UA. I came across this page: https://support.industry.siemens.com/cs/hn/en/view/109755846 Now at the bottom of this page it says "Data type of the elements: WSTRING". When researching what a 'WSTRING' is I found this in the help of Tia Portal V15: "If you do not specify a length, the length of the WSTRING is set to 254 characters by default. You can declare a length of up to 16382 characters (WSTRING[16382])." Further down on the same page it says: "The example below shows the byte sequence if the WSTRING[4] data type is specified with output value 'AB':" Now what i make of this is that a default 'WSTRING' of 254 characters uses (2+2+254*2) 512 bytes. When a 'WSTRING' is at its maximum length this would be (2+2+16382*2) 32.768 bytes. Back to OPC-UA, I am using a de S7 1515 F2-PN with firmware V2.8.x. This means that the recommended maximum number of monitored elements over all subscriptions is 2.000 elements. My question then is; can I interpret this as a recommended maximum of (2000*512) 1.024.000 bytes or even better (2000*32768) 65.536.000 bytes? I understand that more elements means more overhead so this is not really a honest equation... Hopefully someone can clear this up for me, thanks in advance! Noud |
Last edited by: Noud at: 02/12/2020 10:58:30Last edited by: Noud at: 02/12/2020 11:05:47Last edited by: Jen_Moderator at: 02/12/2020 13:52:26Optimized link. |
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2/19/2020 11:16 AM | |
Posts: 5 Rating: (1) |
Bump |
2/19/2020 2:44 PM | |
Joined: 8/3/2009 Last visit: 9/20/2024 Posts: 13753 Rating: (1735) |
Hello here you find some additional Information to this Topic: https://support.industry.siemens.com/cs/ww/en/view/109766727 Bye Murof |
Last edited by: Murof at: 02/19/2020 14:44:27If this Information really helps, you could use the Rate function |
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