Access to data layer with multi application projects

[wagojohannes]

Is it possible to connect from a 2nd application to the data layer to communicate i.e. global variables between both applications?

Currently I can find the data via <F2> only in the 1st application of the device at IoConfig_Globals_Mapping. 

[CodeShepherd · Accepted solution]

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...