"Coupling DBs" for HMI (S7 communication) use case - Manual - TIA2ST - A CLI tool to import TIA Portal project data into a SIMATIC AX project. - TIA2ST - Convert parts of TIA Portal projects to ST code,tool

Generate the SIMATIC AX library for "coupling DBs" in a terminal:

apax tia2st import-db -i ./tia/tia-project --lib MyTiaProjectDB -n MyHmiAccess

Based on this example it will generate a SIMATIC AX library MyTiaProjectDB.lib with following types and access function are located in the namespace MyHmiAccess: - Two types MySharedDB and tank with the same structure as in the TIA project and - the access function GetRefToMySharedDB with the signature:

FUNCTION GetRefToMySharedDB : REF_TO MySharedDB

Add the option --lib below the variable APAX_BUILD_ARGS in the apax.yml file:

variables:
   APAX_BUILD_ARGS:
      - "--lib ./lib/1500/MyTiaProjectDB.lib"

IMPORTANT

• Regardless of the output folder you select for your library, the 1500 folder will always be created in addition.
• At present, there is no support for the llvm target. As a result, unit tests via AxUnit-ST can only be executed on S7-PLCSIM (Advanced) or a real S7-1500 PLC. For both the target is "1500".

Extend your AX application to access the "coupling DBs":

USING MyHmiAccess;

// ...

FUNCTION SetHmiValues
   VAR_TEMP
      sharedDb : REF_TO MySharedDB;
   END_VAR

   sharedDb := GetRefToMySharedDB();
   sharedDb^.processActive := TRUE;

   sharedDb^.tank1.full := TRUE;
   sharedDb^.tank1.level := REAL#100.0;

   sharedDb^.tank2.pump := TRUE;
   // ...

Build and download the AX application.