The KL2408 connects binary control signals from the PLC’s K‑bus to actuators at the field level, offering eight positive‑switching 24 V DC outputs with electrical isolation between K‑bus and field potential. Each channel can switch up to 0.5 A and is short‑circuit and overload protected, with typical short‑circuit current below 2 A and breaking energy < 150 mJ per channel, making it suitable for solenoids, contactors, small valves and indicator lamps. The terminal is protected against reverse polarity, and the power contacts are looped through, with the outputs supplied by the 24 V power contact to feed downstream terminals from the same supply.
All 8 outputs are represented in the process image as eight bits; the terminal requires no address or DIP‑switch configuration, as addressing is handled automatically by the Bus Coupler or Controller. Integrated LEDs per channel display the output status directly on the module, speeding up commissioning and troubleshooting. The connection technology is optimized for single‑ended (1‑wire) wiring, and all connected components share the same reference potential as the KL2408.
Electrical data include a nominal voltage of 24 V DC (−15%/+20%), typical K‑bus current consumption of 18 mA, and current consumption from the power contacts of 60 mA plus load current, with 500 V isolation between K‑bus and field potential. The power contacts can carry up to 10 A, allowing multiple terminals to be supplied along the bus from a single 24 V source. The module is housed in a 12 mm × 100 mm × 68 mm KL‑12‑8pin polycarbonate housing, with IP20 protection and mounting on a 35 mm DIN rail (EN 60715) using Beckhoff’s double slot and key system for side‑by‑side terminals.
Environmental ratings include an operating temperature range of −25…+60 °C, storage temperature of −40…+85 °C, and relative humidity up to 95% non‑condensing, with vibration and shock resistance conforming to EN 60068‑2‑6 / EN 60068‑2‑27 and EMC compliance with EN 61000‑6‑2 / EN 61000‑6‑4. The KL2408 carries approvals for CE, CCC, UL, ATEX, IECEx, DNV GL and cFMus, with Ex markings ATEX II 3 G Ex ec IIC T4 Gc, IECEx Ex ec IIC T4 Gc, and cFMus Class I, Division 2 / Class I, Zone 2, permitting use in Zone 2 / Division 2 hazardous areas when installed according to Beckhoff guidelines.
Typical applications include discrete output expansion in PLC panels and distributed I/O islands, driving 24 V DC contactors, solenoid valves, relays, indicator lamps and small actuators in machinery, building automation and process control systems where compact, high‑density digital outputs are required.
Key Specifications
