These Simatic HMI fail-safe mobile panels include an emergency stop/stop push button on the top and an acknowledgment button on the back of the device that permits a flexible configuration of the safety solution. The emergency stop button is active and illuminated in red only when the device is connected to a safety circuit via the connection box. Devices support the evaluation of the safety elements via hard-wired safety relays (e.g., Sirius 3SK1) and via Profisafe with fail-safe controllers (such as Simatic S7-1500F). Features include a 4-, 7- or 9-in display and scalable software with easy configuration.