# Force Digital Signals

In the diagnostics mode all signals passed to and from the controller internal logic can be forced to a desired state. The signal lines are opened in the diagnostics module. From the user interface both input and output signals can be forced to steady states. The user interface is either the web GUI or the controller GUI.

While signals are forced, the controller operates normally. When leaving the diagnostics mode and the forced mode all signals are set to the current operating state of the controller. This may lead to a change-of-state for digital outputs, which can create unwanted actions.

A | Controller internal state machine and logic functions
B | Digital output signal path
C | Digital input signal path
D | Diagnostics module
E | User interface
F | Forced output signal insertion point
G | Forced input signal insertion point