The C9900-G07x push-button extensions supplement the Economy built-in Panel PCs and Control Panels with an emergency stop and three push-buttons with signal lamp. The push-button extension can be ordered as an ex factory option for all Control Panels and Panel PCs of the Economy family in sizes 7?inches (CP6606, CP6706 and C6906) and 10.1?inches (CP6600, CP6700 and CP6900). The C9900-G070 and G9900-G072 push-button extensions can be controlled and queried via USB or alternatively via a terminal strip. In the case of the C9900-G071 and C9900-G073 the entire wiring goes via a terminal strip. Insert labels for the button caps can be ordered as an option for the individual marking of each button.