Some values within OLT-fields are displayed whereas other values are not

Symptom: Some values within →OLT-fields are displayed. However, other values are not displayed. Instead, some OLT-fields display ---.

Cause 1: The variable (for which the value should be displayed) does not exist on the →PLC.

Solution 1: Build the application and load it onto the PLC (see "Building and loading application onto PLC").

Cause 2: The OLT-field has been created for the output of a →function →call. Afterwards, the debugging feature for FBD has been deactivated e.g. by a system integrator.

Solution 2:

• Delete the OLT-field.

or

1. Close all opened FBD-editors.

2. Exit logi.CAD 3.

3. Ask your s ystem integrator to activate the debugging feature for FBD by using the start option lc3.fbdDebugMemory.

4. Restart logi.CAD 3.

5. Reopen all possibly affected FBD-editors. Change the logic minimally (e.g. move the function call a little bit). Save the changes.

6. Build the application and load it onto the PLC (see "Building and loading application onto PLC").

More causes:

• The target system does not support the query of DMA variables.

• The target system cannot provide the values due to other reasons (siehe "Properties and restrictions specific to the target system") or no correct connection to the target system is possible (see No connection to the target system, but there are error messages).

• The variable is a →reference variable that has been initialized with value NULL . logi.CAD 3 is not able to display values for such variables.

• The variable is a variable based on an →interface . logi.CAD 3 is not able to display values for such variables.

• logi.CAD 3 has been started with the option LC3useRTS3MetaData=false. – In this case, logi.CAD 3 is not able to display values for variables. Solution: Make sure that the generation of metadata is enabled before logi.CAD 3 is started.

  1. Go to the folder where you installed logi.CAD 3.

  2. Locate the file logiCAD3.ini and open it in a text editor.

  3. Search for -DLC3useRTS3MetaData.

  4. If this configuration variable is defined with value false, define the value true.

     Example for corrected lines

     ...

     -Xms256m

     -Xmx6144m

     -DLC3useRTS3MetaData=true

     By default, the generation of metadata is activated in logi.CAD 3. However, the generation has been deactivated due to -DLC3useRTS3MetaData=false (after the option -vmargs).

  5. Save the file.

More useful information:

• Not possible to create OLT-field within one FBD-editor whereas it is possible within another one

• OLT-field can be created within a library element but it cannot be saved