Beckhoff Expands EtherCAT Portfolio With 16-bit Analog Terminals

Beckhoff pushes analog I/O closer to precision control limits

Beckhoff Automation has expanded its EtherCAT terminal portfolio with seven new analog I/O modules, targeting higher resolution and denser control architectures. The new lineup shifts from 12-bit to 16-bit resolution, improving signal fidelity in demanding automation environments.

The update includes input, output, and combined I/O variants designed for modular PLC and distributed control systems. Engineers can now scale channel density without redesigning cabinet layouts or compromising signal accuracy.

As industrial plants move toward tighter process control, this incremental jump in analog resolution signals a broader push toward software-defined signal conditioning at the edge.

Higher resolution meets modular EtherCAT architecture

The new terminals include EL3072, EL3074, EL3078 for analog inputs and EL4072, EL4074, EL4078 for outputs, along with the combined EL4374 module. Channel counts range from two to eight per terminal, allowing flexible system design across compact and large-scale panels.

Each channel supports voltage and current modes such as 10 V and 4–20 mA. Engineers can parameterize each channel individually through TwinCAT software using CoE interfaces, improving configuration speed during commissioning.

The modules also support NAMUR NE43 compliance and extended measurement ranges up to ±107%, improving fault detection and diagnostic headroom in noisy industrial environments.

For control system expansion projects, these modules integrate naturally into existing architectures such as Beckhoff Automation systems, maintaining consistency across EtherCAT-based infrastructures.

Beckhoff’s updated EtherCAT terminals increase resolution to 16-bit and support higher channel density in compact form factors.

EL4374 brings hybrid I/O into a single terminal

The EL4374 stands out as Beckhoff’s first combined analog input/output terminal in this class. It integrates two analog inputs and two analog outputs in one unit, reducing hardware footprint in space-constrained panels.

This design simplifies wiring strategies in applications where only limited I/O points are required. It also reduces spare part inventory and shortens commissioning time in machine-level control systems.

By consolidating functions, the EL4374 reduces reliance on separate modules, improving density without increasing system complexity.

The EL4374 combines analog input and output functions into a single EtherCAT terminal with configurable channels.

Scaling analog input and output without redesigning hardware

The EL3xxx series introduces scalable analog input terminals including EL3072, EL3074, and EL3078. All share the same footprint but differ in channel count, supporting flexible machine configurations.

These modules operate in both voltage and current measurement modes, enabling compatibility with a wide range of industrial sensors. Isolation between channels reduces interference from adjacent wiring in dense installations.

On the output side, EL4072, EL4074, and EL4078 provide up to eight analog output channels, supporting loads up to 750 ohms at 20 mA. This makes them suitable for actuator control and process modulation loops.

System designers working with distributed I/O architectures often pair such modules with platforms in PLC and PAC systems to maintain scalability across plant networks.

Where precision I/O is heading in modern automation

Beckhoff’s shift toward 16-bit analog resolution reflects a wider industry trend toward higher data fidelity at the field level. As edge control systems become more autonomous, analog signal quality directly influences control stability and predictive analytics accuracy.

Compact, high-density terminals also support the ongoing reduction of cabinet sizes in machine design. This aligns with OEM demands for modular architectures that scale without redesign overhead.

Integration with EtherCAT continues to reinforce deterministic communication as a backbone for synchronized I/O expansion in real-time automation environments.

Engineering perspective on the upgrade

The real value of this release lies in system simplification rather than raw specifications. By combining higher resolution, configurable channels, and compact footprints, Beckhoff reduces engineering friction across design, commissioning, and maintenance phases.

In practice, this type of upgrade matters most in mixed-signal environments where analog accuracy directly affects process stability and equipment lifespan.

While the improvements may appear incremental, they meaningfully strengthen EtherCAT’s position as a high-performance distributed control platform.

Author: Daniel Mercer, Industrial Systems Reporter 18 years experience in industrial automation, with background spanning Beckhoff Automation, Siemens drive systems, Emerson DeltaV, and ABB S800 I/O integration projects across process and discrete manufacturing environments.