Beckhoff EL3020

Technical Specifications

• Number of input channels: 2
• Input signal type: 4–20 mA current, differential input
• Resolution: 12 bit with 16-bit data representation
• Conversion time: Typ. 0.625 ms with 50 Hz filter
• Input impedance: High impedance differential input stage
• Measurement accuracy: ±0.2% of full scale
• Isolation: Galvanic isolation between input channels and E-bus
• Power supply: Powered via E-bus
• Operating temperature: -10°C to +60°C
• Storage temperature: -25°C to +85°C
• Weight: Approx. 70 g
• Mounting: 35 mm DIN rail per EN 60715
• Certification: CE, UL

Functional Features

• Differential input design for high noise immunity
• Built-in configurable input filters for signal conditioning
• Integrated diagnostics for open-circuit and overrange detection
• Direct connection to EtherCAT network via E-bus interface
• Compact terminal housing for high-density I/O installation
• Support for distributed clock synchronization for precise timing

Application Scenarios

• Process industry 4–20 mA transmitter signal acquisition
• Pressure, flow, and level sensor signal processing
• Factory automation analog process monitoring
• Test and measurement system data collection
• Building automation HVAC system sensor integration

Working Principle

The terminal receives 4–20 mA current signals from field transmitters through differential input terminals. The signal passes through filtering and conditioning circuits before being converted to digital values by a 12-bit analog-to-digital converter. The digital data is transmitted to the EtherCAT master via the E-bus interface with galvanic isolation between the field side and system side. The terminal also performs continuous diagnostics to detect open-circuit, overrange, and fault conditions, and reports status information to the master controller.

Installation Requirements

• Mount on standard 35 mm DIN rail conforming to EN 60715
• Connect to adjacent EtherCAT terminals via E-bus contacts
• Use shielded twisted-pair cables for analog signal wiring
• Separate signal cables from power cables to reduce electromagnetic interference
• Ensure proper wire termination at screw terminals
• Install end cover at the end of the terminal strip

Usage Notes

• Two-wire transmitters must be powered correctly in series with the input loop
• Do not apply voltages or currents beyond the rated input range
• Shielding of signal cables should be grounded at one end only
• Input filter settings should be configured according to application requirements
• Calibration verification should be performed periodically for high-accuracy applications
• Handle terminals carefully to avoid damage to E-bus contacts