This also includes plc-to-plc-communication via OPC Client and Server. The focus here is set on data exchange in the most interoperable and efficient way (subscriptions, companion specifications, …). Quite in the sense of a strategic orientation of a cross vendor interoperability. OPC UA is a widely known and supported industry standard developed and maintained by the OPC Foundation that was created for a variety of Plug&Play communication use cases. Some features are supported by either one or the other, and for the features that are supported by both, it's ultimately up to your preferences.
To be honest, I'm not sure that a hard comparison between OPC UA and the Web API is that useful.īoth flavors of open interoperability to other systems are fully supported and continuously developed by Siemens. Check out the Issues to get further information about open issues. LimitationsĬurrently some Features are not implemented yet. Hint: The current (first) Wrapper Version supports more API calls than the current S71200 does - the S71200 will likely(!) support the API calls of the wrapper with the next version. Use the following table to find the correct client version for each Plc version (server) SIMATIC S71500: Plc Version write the "Bool" variable await requestHandler. now we want to read the value of a variable called "Bool": var myBool = myPlcProgramDataBlock. Public static DirectoryInfo CurrentExeDir
the Api Method "Api.Browse" to get all the Methods supported by the PLC Api do the following It is not good practice to give a lot of rights to the user "Everybody" therefore please adjust the connectionconfiguration to your configured user with a safe password that should be able to call the methods.įurther examples of usage are also provided in the UnitTests of the component. The used functions would fail for the default case that he doesn't have the permissions call the method (that he tried to call). In the following example code you'll have to adjust the IpAddress ("192.168.1.1") and the login for your system - the Login "Everybody" with the password "" is a default user that is downloaded to the plc for the webserver once the webserver is activated in TIA portal. The Functionalities come together in the ApiHttpClientRequestHandler that implements the IAsyncApiRequesthandler (and also in any implementation of the IApiRequestHandler - not given by example).
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