Beckhoff ELM3502-0000 ELM Series 2-Channel Analog Input EtherCAT Terminal

Description

Engineered to meet the stringent demands of high-speed industrial metrology, the Beckhoff ELM3502-0000 measurement terminal captures precise differential signals from strain gauges and resistor bridges. Supporting full, half, and quarter-bridge topologies, this high-end module features 24-bit resolution and simultaneous sampling speeds up to 20 ksps per channel. Enclosed in a robust zinc die-cast housing for optimal thermal and electrical shielding, it integrates seamlessly into Beckhoff EtherCAT control architectures, utilizing Distributed Clocks for synchronized, sub-microsecond multi-channel alignment.

Features

• Dual-channel high-speed differential measurement interface.
• Full, half, and quarter-bridge resistor strain gauge input compatibility.
• Selectable oversampling factor from 1 to 100 (up to 20 ksamples/s).
• Integrated diagnostic features, including broken wire and short-circuit monitoring.
• Advanced DSP features: TrueRMS, non-linear scaling, PeakHold, integrator, and differentiator filters.
• Robust zinc die-cast enclosure with integrated status LEDs.

Applications

• Industrial test benches and dynamic dynamometer load monitoring.
• Real-time structural health monitoring and strain analysis.
• High-speed weighing systems and inline material tensioning control.
• Geotechnical and civil engineering monitoring systems.

Technical Specifications

Empirical Engineering Insights

Alternative Models & Compatibility

The ELM3502-0000 is part of Beckhoff’s high-end measurement class. Unlike standard analog slice terminals (such as the EL3356), the ELM3502-0000 provides vastly superior sampling speeds and built-in numerical filters, making it compatible with complex TwinCAT 3 Metrology functions. It requires a compatible EtherCAT Coupler (e.g., EK1100) and proper configuration in TwinCAT for oversampling features.

Application Pitfalls & Engineering Notes

Due to its high sampling rate of 20 ksps, the terminal is sensitive to high-frequency electrical noise and electromagnetic interference. Standard unshielded cabling can distort measurements. Ensure that the metal housing of the ELM3502-0000 makes direct, clean contact with the grounded DIN rail via the grounding springs on the rear panel. When routing signal lines, keep bridge cables separated from high-voltage AC or motor-drive output lines.

Commissioning & Wiring Tips

For quarter-bridge installations, verify that the internal completion resistors are correctly parameterized within the TwinCAT System Manager. Ensure the 6-pin push-in service plug is locked securely in place. If utilizing Distributed Clocks (DC), activate sync managers in TwinCAT to achieve sub-microsecond jitter timing across multiple measurement channels on the network segment.

Installation Guidelines