Description
Acquisition of high-precision analog signals within synchronized automation environments is handled directly by the Beckhoff EL3114, an EtherCAT terminal delivering four independently isolated differential current measurement channels spanning 0 to 20 mA. Operating with a high-fidelity 16-bit resolution, this industrial terminal converts current loop values into clean process data for the EtherCAT controller. Equipped with high-speed hardware capabilities, it supports Distributed Clocks (DC) with a synchronization accuracy of under 1 microsecond, making it ideal for fast, time-aligned loop measurements across multi-node automation architectures.
Features
- Four independent, differential analog inputs designed to minimize ground loop interference.
- Precise 16-bit analog-to-digital conversion process (including sign representation).
- Integrated hardware synchronization via EtherCAT Distributed Clocks (DC) with synchronization deviation below 1 microsecond.
- Built-in 5 kHz hardware input filter to reject high-frequency mechanical and electromagnetic noise.
- Robust electrical isolation of 500 V (RMS) between the internal E-bus control logic and field signals.
- Compact 12 mm housing width maximizing density inside standard control panels.
Applications
- Industrial process control networks monitoring standard 0 to 20 mA current loops.
- Distributed data acquisition systems requiring microsecond-level synchronization.
- Closed-loop feedback systems in assembly, packaging, and high-speed material handling.
- Power and current tracking installations across sub-distribution enclosures.
Technical Specifications
| Specification Parameter |
Value / Rating |
| Manufacturer |
Beckhoff Automation |
| Model Number |
EL3114 |
| Technology |
Differential input |
| Number of Inputs |
4 |
| Input Signal Range |
0 to 20 mA |
| A/D Resolution |
16-bit (including sign) |
| Distributed Clocks (DC) |
Yes, accuracy < 1 microsecond |
| Input Filter Limit Frequency |
5 kHz |
| Internal Input Resistance |
typ. 85 Ohm + diode voltage |
| Measuring Error |
< ±0.3% (relative to full scale value) |
| Conversion Time |
typ. 100 microseconds |
| E-bus Current Consumption |
typ. 130 mA |
| Electrical Isolation |
500 V (E-bus / signal voltage) |
| Process Image Bit Width |
Inputs: 16 bytes |
| Connection Technology |
Cage clamp (spring-actuated) |
| Conductor Sizes |
Solid/Stranded: 0.08 to 2.5 mm²; Ferrule: 0.14 to 1.5 mm² |
| Housing Dimensions |
12 mm x 100 mm x 68 mm |
| Operating Temperature |
-25 degC to +60 degC |
| Relative Humidity |
95%, non-condensing |
| Protection Rating |
IP20 |
| Approvals |
CE, UL, ATEX (II 3 G Ex nA IIC T4 Gc) |
| Shipping Weight (Calculated) |
0.055 kg |
Connections and Interfaces
| Terminal Contact Point |
Signal Assignment |
Description |
| 1 |
Input + (Ch 1) |
Differential Current Input Positive, Channel 1 |
| 5 |
Input - (Ch 1) |
Differential Current Input Negative, Channel 1 |
| 2 |
Input + (Ch 2) |
Differential Current Input Positive, Channel 2 |
| 6 |
Input - (Ch 2) |
Differential Current Input Negative, Channel 2 |
| 3 |
Input + (Ch 3) |
Differential Current Input Positive, Channel 3 |
| 7 |
Input - (Ch 3) |
Differential Current Input Negative, Channel 3 |
| 4 |
Input + (Ch 4) |
Differential Current Input Positive, Channel 4 |
| 8 |
Input - (Ch 4) |
Differential Current Input Negative, Channel 4 |
Empirical Engineering Insights
Alternative Models & Compatibility
The EL3114 can directly replace legacy EL311x models if process software mappings are verified. Systems switching from non-DC terminals to the EL3114 should ensure that Distributed Clock synchronization is enabled in the TwinCAT active configuration to prevent time-base drift. Ensure the ES3114 variant is selected if pluggable terminal connector modules are preferred for on-site swapping.
Application Pitfalls & Engineering Notes
The internal differential input path relies on standard operational amplifiers with a absolute maximum common-mode voltage limit of 10 V. Exceeding this boundary across channels will result in severe measurement clamping and non-linearities. Additionally, because this terminal draws a continuous 130 mA from the internal E-bus connection, system integration planners must verify the total current output profile of the preceding Bus Coupler (such as an EK1100) and insert intermediate power supply terminals (EK1110 / EL9400) if the cumulative E-bus budget is exceeded.
Commissioning & Wiring Tips
To protect sensitive low-amplitude signal transmissions, always route current loops with shielded twisted-pair cabling. Ground the shield at the cabinet entry or terminal bracket. Filtering parameters (such as the IIR/FIR low-pass behavior) are completely adjustable in the TwinCAT Software via the CoE (CAN over EtherCAT) parameter objects 0x80n0, allowing the 5 kHz hardware filter to be fine-tuned to isolate mechanical vibrational noise patterns.
Installation Guidelines
CRITICAL WARNING:
Disconnect all electrical power lines supplying the DIN rail assembly, the controller, and any external loop interfaces before mounting or extracting terminal modules. Hot-plugging or wiring under power is strictly forbidden as it can damage internal bus contacts and lead to module destruction.
1
Mount the EL3114 onto a standard 35 mm DIN rail (conforming to EN 60715) by sliding it until the double slot and key interlocking guides snap firmly into the adjacent terminal housing.
2
Secure the grounding and bus connections by checking that the lateral copper E-bus contact blades click together smoothly with no gaps in the segment assembly.
3
Strip terminal conductor ends to a length of 8 to 9 mm. Insert a flat screwdriver into the spring release slot, insert the wire (solid/stranded up to 2.5 mm²), and release the spring mechanism to complete the wire capture.