Is it possible to connect from a 2nd application to the data layer to communicate i.e. global variables between both applications?
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Currently I can find the data via <F2> only in the 1st application of the device at IoConfig_Globals_Mapping.Â
Access to data layer with multi application projects
Best reply by CodeShepherd
For clarification:
- As each of the applications in a PLC project has their own memory area, it is not possible to access data that is declared in the other one
- Only one application can the set to be actively update IOs, same for the data layer realtime area
- A global variable list set up in the POU area gets instanced by each application
Possible data exchange:
- Create data in the data layer with one application using the symbol configuration and access them via read/write function blocks out of CXA_DataLayer
- Create an shared memory with one application and access it via the other
- Create network variables with one application and access it via the other
- Use any other TCP based protocol to exchange data, e.g. OPC-UA, sockets, UDP...
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