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Hello Cliff,
I tried to use snap7 to read some from PLC 300 and 400 to MS SQL DB. Seems works good. But I catch some troubles with this library that time using C# wrapper... So I continued to use DotNetSiemensPLCToolBox library. Developer contacts well and helped me a lot to solve some question. So All my projects use DotNetSiemensPLCToolBox. I build multitask services to read values and write to DB once 500ms-1s. About 100 threads use only 16Mb RAM. My friend used my project to read up to 2000 parameters with the same mode.
I tried to use snap7 to read some from PLC 300 and 400 to MS SQL DB. Seems works good. But I catch some troubles with this library that time using C# wrapper... So I continued to use DotNetSiemensPLCToolBox library. Developer contacts well and helped me a lot to solve some question. So All my projects use DotNetSiemensPLCToolBox. I build multitask services to read values and write to DB once 500ms-1s. About 100 threads use only 16Mb RAM. My friend used my project to read up to 2000 parameters with the same mode.