ES3602 Beckhoff
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The Beckhoff ES3602 is part of the ES EtherCAT Terminals series and features two differential inputs with a 24-bit resolution. It supports common mode voltages up to 35 V and typical E-bus current of 190 mA. The terminal's input filter cutoff is 3 kHz and crosstalk attenuation is greater than 60 dB.
Internal Product Review
The ES3602 is a highly capable Beckhoff EtherCAT terminal for analog signal acquisition, offering 2 differential inputs and 24-bit resolution. Measurement accuracy is excellent with less than ±0.01% error, and the selectable ±10/±5/±2.5/±1.25 V ranges suit varied instrumentation tasks. A strong option for precise EtherCAT measurement where signal fidelity is critical.
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Product Description:
The ES3602 is a modular input terminal produced by Beckhoff within the ES EtherCAT Terminals series. Designed for installation on a distributed EtherCAT I/O strand, the product converts external analog voltages into digital data for PLC-based control tasks in industrial automation. Its input circuit is differential, which improves noise rejection when cables run alongside switching power lines. By linking directly to the E-bus, the unit eliminates local power wiring and supports compact signal acquisition close to sensors or test points on a machine, which helps reduce long analog cable runs inside the cabinet.
The terminal samples each channel with a 24-bit converter, allowing detection of fine voltage changes across the selectable range of ±10/±5/±2.5/±1.25 V. Before digitization, the front end passes through a 3 kHz low-pass filter; this cutoff attenuates out-of-band noise while preserving relevant signal content. The processor completes a conversion cycle every 20 ms, and the multiplex architecture alternates between the two inputs without missing intervals. Logic and analog circuitry draw only 190 mA typical from the E-bus, so no external supply is needed. High input impedance above 200 kΩ minimizes sensor loading, and the pluggable wiring level housing simplifies connection access during installation and service.
Signal integrity is reinforced by a crosstalk specification of > 60 dB, preventing channel interference even when both lines operate at full span. The input stage also tolerates a common-mode potential up to 35 V maximum, so sensors referenced to different grounds can be connected safely. Overall accuracy is limited to < ±0.01 %, supporting precise measurement loops that feed closed-loop controllers. A footprint of 12 x 100 x 68 mm permits dense packing on DIN-rail assemblies and leaves more cabinet space available for power electronics and control processors.
