The IO-Link device is intended to be part of a modular signal tower. This is used for issuing digital signals for controlling the modular 70 mm signal elements. The IO-Link device is connected to an IO-Link master via an IO-Link A port. Use within different networks is possible via the IO-Link master. You can assemble a signal tower corresponding to your requirements by combining one IO-Link device with a maximum of five further elements in any way. Only use the IO-Link device as the lowest element on a connection element. Set up to a maximum of five optical signal elements or up to four optical and one audible signal element. Only use an audible signal element as the top element. A bayonet locking system establishes the mechanical and electrical connection between the elements. Connection elements with spring-cage connection can be used for electrical connection of the signal tower. Various accessories are available to assemble the signal tower.