Product Description:

The RMK02.2-LML-SER-FW is a communication module produced by Bosch Rexroth Indramat for the RECO Drive Modules series. Installed in multi-axis drive racks, it provides a SERCOS fiber-optic ring so motion controllers can exchange real-time data with individual drive inverters. Within an automation cell the unit serves as the network master, coordinating cycle timing and diagnostic traffic between drives, I/O slices, and higher-level PLCs.

The module is powered from a nominal bus voltage of 24 VDC, and it draws up to 2.5 A while limiting inrush by an internal 3.0 A fuse. Voltage stability is maintained as long as ripple does not exceed 4 Vss and supply variation stays inside the ±20 % tolerance window. Communication timing starts with a minimum ring cycle of 0.5 ms; this low latency supports torque and position loops that require deterministic refresh. Packet throughput is capped by a SERCOS phase-2 data rate of 4 Mbits/s, and device addresses from 0 to 99 can be assigned for organized telegram routing. The card backs up low-level electronics for 15 I/O plug-in modules and passes a continuous current feed to them while keeping ripple within spec.

Network capacity reaches 254 stations per optical loop, each connected through duplex Fiber Optics that minimize electromagnetic interference on the plant floor. Field wiring can use conductors up to 2.5 mm², and the terminal strip is rated for the same cross-section on auxiliary 24 V feeds. The housing carries an IP20 rating, so it must be mounted in a closed control cabinet; overall size is 192 mm high, 41.3 mm wide, and it seats on the RECO rail without extra brackets. The compact card supports a 2.5 A downstream supply for attached modules, tolerates 4 V peak-to-peak ripple, and its addressable limit of 99 ensures ring integrity when large drive arrays are segmented into manageable sections.