# Monitor Digital Signals

In the diagnostics mode all signals passed to and from the controller internal logic can be monitored. A signal tap is connected in the diagnostics module and the signal states are displayed on the web GUI or the controller GUI.

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 | Output signal tap
G | Input signal tap