Beckhoff EL3356-0020 EtherCAT Terminal 1-channel Analog Input

Description

Designed specifically for high-accuracy gravimetric and force monitoring applications, the Beckhoff EL3356-0020 EtherCAT Terminal processes differential signals from full-bridge strain gauges with exceptional speed and precision. This terminal interfaces directly with resistor bridges to deliver reliable, factory-calibrated measurements in industrial process environments.

Key Features

• Direct interface for one resistor bridge in full-bridge technology.
• High-resolution 24-bit analog-to-digital conversion with 32-bit data presentation options.
• Factory calibration certificate stored internally for guaranteed accuracy.
• Supports Distributed Clocks (DC) for precise temporal synchronization across the EtherCAT network.
• Integrated dynamic filters, quadruple averager, and self-calibration routines.

Industrial Applications

• High-precision industrial platform scales and vessel weighing.
• Material testing machines and tensile strength evaluation systems.
• Silo and hopper level measurements with dynamic load distribution.
• Torque and force monitoring on rotating equipment.

Technical Specifications

Alternative Models & Compatibility

Comparing the EL3356-0020 to standard EL3356 terminals, the primary differentiator is the included factory calibration certificate stored directly within the terminal's internal non-volatile memory. To maintain compatibility with TwinCAT projects, ensure the corresponding EtherCAT XML Device Description (ESI) file matches this precise hardware revision to prevent E-bus initialization failures.

Application Pitfalls & Engineering Notes

When deploying inside high-density control panels, thermal fluctuations can degrade calibration accuracy. While the active self-calibration routine corrects for gain and offset drift, mounting the terminal away from high-heat components like variable frequency drives is recommended. Additionally, aggressive setting of dynamic filters (CoE 0x8000) may introduce signal delays that can affect high-speed check-weighing applications.

Commissioning & Wiring Tips

Shielding is critical when dealing with microvolt-level differential signals (UD). Run strain gauge cabling through dedicated conduits and terminate the overall shield directly to the grounded DIN rail via low-impedance grounding clamps. Ensure CoE parameters (such as the notch filter for 50 Hz/60 Hz noise rejection) are aligned with your localized grid frequency to maximize signal stability.

Installation Guidelines