Create and configure the TcCOM-Wrapper-FB

Navigate to Configuration Parameters > Code Generation > TC TcCom Wrapper.

Check the checkbox TcCom Wrapper FB here. The checkbox is unchecked in the standard configuration.

You can use the checkbox TcCom Wrapper FB properties to configure whether the module parameters on the FB are to be created as properties. See Configuration of data access to data of a TcCOM object, especially Parameter: Initial values.

You can learn how to apply the generated wrapper here: Applying the TcCOM Wrapper FB.

Sample

By setting the Parameter: Initial Values under Tc TcCom Interfaces, the model parameters are created as module parameters (switched on by default). Now create the "TcCom Wrapper FB" with the option "TcCom Wrapper FB properties". Set the property monitoring to "CyclicUpdate" to see the value change of the property directly in the online view.

Then you can access the module parameters as follows, for example:

PROGRAM MAIN
VAR
   
   // dynamic instance: create TcCOM from PLC
   InitStrDyn : ST_FB_TempCtrl_TcCOM_InitStruct_InitStruct := (
               TaskOid:= 16#02010030,                    // take TaskOID of PlcTask
               eModuleCaller:= ModuleCaller.Module );        // set module caller to "call by module"
   fbTempCtrDyn : FB_TempCtrl_TcCOM_InitStruct(InitStrDyn);
   
   Outputs    : ExtY_TempCtrl_T;   // input
   Inputs     : ExtU_TempCtrl_T;   // output
   Parameters : P_TempCtrl_T;      // parameter

   bChange: BOOL;
END_VAR

fbTempCtrDyn(TempCtrl_U := Inputs, TempCtrl_Y => Outputs);

IF bChange THEN
   Parameters.Kp := 10;
   fbTempCtrDyn.TempCtrl_P := Parameters;
END_IF

In the "advanced" configuration level, the monitoring attribute of the properties can also be specified. In the default case, "No Monitoring" is set, i.e. no attribute is set.

Monitoring attributes influence the visibility of the attribute values in the online view, i.e. when you have logged into the PLC and want to monitor the current values of the properties on the FB.

• No Monitoring: the values are not visible in the online view.
• Cyclic Update: the values of the properties are updated and displayed cyclically.
  In the logged-in state in the PLC additional code is executed.
• Execution Update: the values of the properties are only updated in the online view if getter/setter methods for the properties are called in the execution code. This quickly leads to irritation and is only relevant in rare cases.