PROFIBUS OLMs are designed for use in optical PROFIBUS fieldbus networks. They allow the conversion of electrical PROFIBUS interfaces (RS-485 level) into optical PROFIBUS interfaces and vice versa. The modules can be integrated in existing PROFIBUS fieldbus networks with the known advantages of optical transmission technology.

A complete PROFIBUS fieldbus network can also be set up with modules in a linear (bus), star or ring topology as well as any combination of these topologies. To increase the reliability of the fieldbus network in case of failure, the redundant ring is supported.

The electrical channel is designed as 9-pin D-sub socket. An RS-485 bus segment complying with PROFIBUS standard EN 50170 /2/ can be connected to this channel. The fiber-optic cables are connected via BFOC1 /2.5 connectors. Six multicolor LEDs indicate the current mode and any disruptions as well as the level ratios on the optical interfaces.