Product Description:

The RMK02.2-LWL-SER-FW is a communication interface manufactured by Bosch Rexroth Indramat and organized under the RECO Drive Modules series. It serves as an optical link controller that joins individual drive controllers to a deterministic SERCOS motion bus. In an automation cell, the module occupies one slot in a RECO rack and converts electrical drive data to light signals, allowing transmission between the central control and the drives without susceptibility to electromagnetic noise. By closing the fiber-optic ring, it helps coordinate axis commands, status words, and synchronous sampling across the network.

Its slim profile of 41.3 mm in width permits dense mounting beside other RECO cards, while the height of 192 mm lines up with the standard rack backplane connectors. A depth of 81 mm leaves sufficient clearance for bending radii of the incoming patch leads. The enclosure meets the IP20 category, so fingers and debris larger than 12.5 mm are kept away from live conductors, yet the device must be placed inside a closed cabinet. Optical transmission is realized through a duplex pair of fiber-optic cables, which eliminates ground potential differences and preserves signal integrity over longer cabinet-to-cabinet spans.

As a plug-in module for a control cabinet environment, the unit latches onto a DIN rail frame and receives power and bus lines from the RECO backplane. It communicates with the motion master through the SERCOS protocol, exchanging telegrams in timed cycles of the network’s service channel. Within the ring, it acts as a SERCOS I/O Participant, forwarding telegrams and injecting its local status into the deterministic loop. When multiple drives form a SERCOS Drive Ring, this module ensures the optical path is closed; if a break occurs, the internal bypass maintains data flow so axis synchronization is not lost.