Siemens SIMATIC KTP400 Basic Operating Instructions Manual page 67

Procedure
In "Offline" mode, you can test individual project functions on the HMI device without them
being affected by the PLC. PLC tags, therefore, are not updated.
Test the operating elements and visualization of the project as far as possible without
connecting to the PLC.
Requirements for online testing
● The project has been transferred to the HMI device.
● The HMI device is in "Online" mode.
Procedure
In "Online" mode, you can test individual project functions on the HMI device without them
being affected by the PLC. PLC tags are updated in this case.
You have the option to test all communication-dependent functions, for example alarms, etc.
Test the operating elements and views of the project.
KTP400 Basic, KTP600 Basic, KTP1000 Basic, TP1500 Basic
Operating Instructions, 08/2008, A5E01075587-01
Commissioning a project
6.4 Transfer
67