The safety relays of the SAFEMASTER series monitor safety functions such as emergency stop, safety gate, light barrier, two-hand control, safety mat or light grid as well as other functions. The solutions for safe drive monitoring ensure increased productivity and operator safety by combining safe speed, standstill or frequency monitoring, optionally also sensorless. The multifunctional safety solutions enable safe monitoring of all safety circuits of machines and systems through modular and configurable safety systems. In addition to the safe mobile radio emergency stop system and wireless enabling switches of the SAFEMASTER W family, Dold also offers a safe, bidirectional radio safety system.