KM2008 by Beckhoff

The KM2008 is a digital output terminal developed by Beckhoff for the KM Bus Terminals series. Intended for modular I/O stations, the component attaches beside a Bus Coupler and provides multiple 24 V field outputs in a single housing. By channeling control data through the internal K-Bus, the terminal eliminates separate signal cabling to the CPU and streamlines installation in machine controllers, conveyor lines, and process skids where compact DIN-rail automation hardware is required.

Each connector provides eight output channels that operate at a nominal voltage of 24 VDC and can deliver up to 0.5 A to resistive, inductive, or lamp loads without external relays. Galvanic isolation of 500 V protects the terminal electronics from high-energy switching events. Power for the microelectronics is supplied exclusively through the K-Bus, with a current draw of only 5 mA, so no auxiliary logic supply is needed. The separate load-voltage path requires only 15 mA, keeping cabinet power requirements modest. Output conductors may be connected using single-wire, two-wire, or three-wire techniques, providing flexibility in grounding and feedback arrangements. The housing supports variable installation positions, allowing the unit to fit upright or flat orientations inside control enclosures.

The module exposes 64 outputs to the controller, and the communication layer represents them as an 8-byte process image that is 64 bits wide, allowing direct bit addressing from the PLC. Mechanical integration is provided by a 35 mm DIN rail, which also supports the spring contacts for the K-Bus connection. The enclosure has an IP20 protection rating, providing touch-safe terminals for installation in closed control panels. The compact housing conserves rail space while accommodating the connectors and internal bus contacts needed for the full channel count. Spring-contact integration also allows the communication path to continue across adjacent terminals without separate internal wiring.