Description
Integrating PROFIBUS fieldbus networks into high-performance EtherCAT networks is simplified using the Beckhoff EL6731 communication interface. This 1-channel PROFIBUS master/slave terminal enables bidirectional data transfer between EtherCAT Terminals and legacy PROFIBUS DP, DP-V1, DP-V2, and MC installations. It operates seamlessly within the TwinCAT system, allowing differing DP cycle times per slave through the implementation of the CDL (Co-processor Dependency Link) concept.
The module functions as a highly integrated gateway, supporting up to 125 slaves and transfer rates from 9.6 kbaud up to 12 Mbaud. Its design features galvanic decoupling of the communication interface, status LEDs for rapid diagnostics, and distributed clocks for precise synchronization, making it a reliable choice for complex distributed industrial control architectures.
Features
- Single-channel communication interface supporting both PROFIBUS master and slave operation modes.
- Compatible with PROFIBUS DP (standard), DP-V1 (Class 1 and 2 acyclic services, alarms), DP-V2, and equidistant PROFIBUS MC.
- Supports differing DP cycle times per slave via CDL concept execution.
- Galvanically decoupled D-sub 9-pin interface for enhanced signal integrity and noise immunity.
- Integrated EtherCAT Distributed Clocks functionality for precise synchronization.
- Clear hardware diagnostics via integrated front-facing status LEDs.
Applications
- Power generation and distribution facility monitoring.
- Oil and gas refinery legacy network migration.
- Water and wastewater treatment automation.
- Factory automation and robotic assembly line synchronization.
- Integration of legacy PROFIBUS motor drives, sensors, and remote I/O into modern EtherCAT architectures.
Technical Specifications
| Manufacturer |
BECKHOFF |
| Part Number / Model |
EL6731 |
| Technology |
PROFIBUS DP master/slave terminal |
| Number of Channels |
1 |
| Data Transfer Rates |
9.6 kbaud to 12 Mbaud |
| Interfaces |
1 x D-sub socket, 9-pin, galvanically decoupled |
| Bus Device Capacity |
Max. 125 slaves (up to 244 bytes input, output, parameter, configuration, or diagnostic data per slave) |
| Process Image Bit Width |
Total max. 1.4 kbyte input and 1.4 kbyte output data |
| Distributed Clocks |
Yes |
| Current Consumption E-bus |
Typical 200 mA |
| Hardware Diagnostics |
Status LEDs |
| Operating Temperature |
-25 degC to +60 degC |
| Storage Temperature |
-40 degC to +85 degC |
| Relative Humidity |
95 %, no condensation |
| Vibration/Shock Resistance |
Conforms to EN 60068-2-6 / EN 60068-2-27 |
| EMC Immunity/Emission |
Conforms to EN 61000-6-2 / EN 61000-6-4 |
| Protection Rating |
IP20 |
| Installation Position |
Variable mounting position |
| Housing Material |
Polycarbonate |
| Dimensions (W x H x D) |
24 mm x 100 mm x 52 mm |
| Installation |
On 35 mm DIN rail (conforming to EN 60715) with lock |
| Wiring Connection |
Specific push-in connection (E-bus) |
| Weight |
Approx. 70 g |
Connections and Interfaces
| Connector / Pin |
Function / Description |
| 9-Pin D-Sub Socket |
Standard PROFIBUS interface (galvanically isolated) |
| Push-in Terminals |
Direct connection to Beckhoff EtherCAT E-bus terminal block assembly |
Installation Guidelines
-
Mounting: Mount on standard 35 mm DIN rail conforming to EN 60715. Ensure the locking slide mechanism is securely engaged.
-
Shielding & Grounding: Ensure the DIN rail is connected to a low-impedance functional earth. PROFIBUS cable shields must be grounded properly at the connector housing to prevent electromagnetic interference.
-
Air Circulation: Leave sufficient ventilation space above and below the terminal block assembly to allow passive cooling. Do not block air paths when mounting side-by-side with other EtherCAT terminals.
-
Wiring: Use specialized PROFIBUS-certified shielded twisted-pair cables for the D-sub connection and observe the maximum segment lengths based on selected baud rates.
Compliance and Certifications
- CE
- UL
- ATEX: II 3 G Ex nA IIC T4 Gc