Product Description:

The EL3602-0002 is a two-channel analog input terminal produced by Beckhoff within the EL EtherCAT Terminals series. It accepts low-level differential voltages from sensors, converts them to digital data, and transmits the results over the EtherCAT network for PLC processing. The terminal occupies only 12 mm of DIN-rail width, stands 100 mm tall, and has a depth of 68 mm, so it fits beside other modular I/O blocks. In distributed automation, it provides precise voltage feedback needed for closed-loop drives, quality tracking, and energy monitoring.

Each channel operates across a ±200 mV full-scale span, which allows direct connection of millivolt sources such as strain gauges without external amplifiers. Conversion is performed with a 24-bit delta-sigma converter, giving sub-microvolt granularity for fine process measurements. The terminal’s default cycle time is 20 ms, so two inputs are sequentially sampled by the internal multiplex circuitry and reported every PLC scan. A front-end filter with a cutoff at 10 kHz attenuates high-frequency interference before digitization, maintaining signal integrity. Total measurement uncertainty remains within ±0.05 % FS, supporting tight-tolerance applications. Differential sensing, multiplex sampling, and an input count of two channels combine to reduce wiring loops while still isolating ground offsets.

Additional electrical limits preserve accuracy and safety. Common-mode voltage must stay below 35 V, preventing damage from floating or miswired sources. Crosstalk attenuation is more than 60 dB, so adjacent signals do not corrupt one another. Each input presents an impedance of more than 200 kΩ, minimizing loading on delicate transducers. The housing carries a IP20 rating, matching typical control cabinets that are already protected from dust and moisture.