Product Description:

The KL3012 analog input terminal is produced by Beckhoff within the KL Analog Input Modules series. Designed for the company’s modular Bus Terminal system, the slice converts process currents into digital values that can be read by a controller. By translating 0–20 mA instrumentation signals directly on the DIN rail, the unit removes the need for separate signal conditioners and allows compact, high-density data acquisition in industrial automation cells and machine panels.

The terminal offers two differential input channels that each accept a process current range of 0–20 mA. Conversion is performed with a 12-bit resolution, yielding 4096 discrete steps over the span so the controller can detect small changes in transducer output. For every channel the measured value is transferred over the K-bus as a 2 x 16-bit data word, a width that aligns with Beckhoff PLC variable formats and avoids extra scaling. The input circuit presents an internal burden of 80 Ω plus a 0.7 V diode so field devices experience minimal load. Common-mode rejection is ensured up to 35 V, which protects the ADC against ground offsets often seen in large machines. Because power is supplied via the K-bus and address setting is not required, installation time is reduced and wiring stays orderly.

Physically, the slice snaps onto a 35 mm EN 60715 rail and occupies only 12 x 100 x 68 mm, letting designers stack many channels in narrow enclosures. The housing carries a IP20 rating, adequate for cabinets where conductive dust and moisture are excluded. Surge events up to 35 VDC on the signal lines can be tolerated without permanent damage, an important safeguard when wiring runs alongside inductive loads. With no power contacts at its base, the KL3012 keeps the full current loop isolated from supply conductors, so field wiring remains limited to sensor pairs.