EL3702 Beckhoff
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MPN: EL3702-0000
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The Beckhoff EL3702 is part of the EL EtherCAT Terminals series and provides two simultaneous differential inputs with a 16-bit resolution. It supports a maximum input rate of 100 ksamples per second and connects using E-bus for electronics supply. Mounted on a 35 mm DIN rail, the EL3702 offers IP20 protection and can sample signal voltages up to ±10 V.
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Product Description:
The EL3702 is an analog input terminal produced by Beckhoff as part of the EL EtherCAT Terminals series. Within an automation rack, the unit converts analog sensor signals into synchronized digital values that a PLC or motion controller can process in real time. Simultaneous sampling and submicrosecond timestamping allow the terminal to capture transient events, monitor servo performance, and record process variables without external data acquisition hardware. This functionality is useful when rapid signal changes must be compared accurately across multiple measurement points.
Each input is sampled at up to 100 ksamples/s, and simultaneous sampling preserves the phase relationship between the channels during rapid transients. The conversion depth is 16-bit, providing a quantization step of approximately 305 µV across the full ±10 V differential range. Distributed clock synchronization provides a precision of < 100 ns, keeping the sampled data closely aligned with the EtherCAT clock master. The measurement circuitry uses a differential ground reference to reduce common-mode noise from nearby drives and other electrical equipment. An internal oversampling engine reaches a factor of 100, allowing raw data to be decimated or transmitted at line rate as required by the application. The terminal has two inputs that share the same isolation boundary, providing consistent signal paths for correlated measurements.
The EL3702 installs on a 35 mm DIN rail alongside other EtherCAT terminals and receives its electronics power from the E-bus, so it does not require a separate field supply. Its IP20 protection class makes it suitable for enclosed control cabinets where exposure to contaminants is limited. The module transfers its data to the process image as n × 2 × 16 bits, with an additional 2 × 16-bit status word and 4 bytes of header information. This data structure provides deterministic access during each bus cycle. Support for distributed clocks keeps multiple EL3702 terminals synchronized when several measurement points must be sampled together. The programmable oversampling factor allows the application to adjust the amount of transferred data without requiring changes to the connected sensors or measurement wiring.
