EL3356 BECKHOFF

EL3356 BECKHOFF Termination Unit

Product  Description：

Beckhoff Termination Units, often implemented as EtherCAT Terminals (EL series) or Bus Terminals (KL series) end caps and specialty supply units, serve as the definitive mechanical and electrical completion point for a modular I/O block. These units are designed to properly terminate the internal E-bus or K-bus communication signals on a DIN rail segment, preventing signal reflection and ensuring data integrity. Additionally, many termination variants integrate power feed terminals to isolate or refresh the electrical potential for downstream I/O modules.

Product Parameters

The technical characteristics of a Beckhoff Termination Unit focus on bus synchronization, electrical isolation, and power distribution parameters:

• Bus Connection: Integrated gold-plated slide contacts that complete the internal E-bus (EtherCAT) or K-bus (Bus Terminal) data loop.

• Nominal Voltage Support: Typically handles power contact configurations up to 24V DC or 230V AC depending on the specialized supply version.

• Current Carrying Capacity: Internal power contacts (power shafts) are generally rated to pass continuous currents up to 10A.

• Dielectric Strength: Offers high isolation performance, frequently rated at 500V RMS between the internal bus logic and the field power lines.

• Current Consumption: Negligible power draw from the internal bus loop, typically under 10mA to minimize CPU power rail loading.

• Connection Technology: Features patented cage clamp or push-in spring connections for rapid, vibration-proof field wiring.

Product Advantages

Beckhoff Termination Units provide essential stabilization and logistical benefits to modular automation systems:

• Signal Reflection Elimination: By providing precise impedance matching at the physical end of the terminal segment, the unit prevents data corruption caused by echo signals on the high-speed communication bus.

• Potential Group Isolation: Allows automation engineers to segment a single I/O rack into distinct electrical zones, enabling separate emergency-stop circuits on the same DIN rail.

• Tool-Free Installation: Leverages the standard Beckhoff interlocking housing design, allowing the unit to snap directly onto a standard 35mm DIN rail and engage the bus contacts automatically.

• Maintenance-Free Connections: The vibration-resistant spring-loaded terminal design eliminates the need for periodic screw tightening, ensuring long-term contact reliability in harsh environments.

• Diagnostic Transparency: Higher-end termination units incorporate basic bus diagnostic pass-through capabilities, helping the main coupler identify the exact physical boundary of the local network segment.

Product Applications

These units are mandatory components utilized across every industry that deploys Beckhoff modular I/O architectures:

• CNC Machinery and Robotics: Terminating high-speed EtherCAT terminal blocks on multi-axis machines where data transmission errors would cause motion faults.

• Wind Turbine Control: Segmenting power distribution and ensuring signal integrity in remote I/O enclosures located inside the turbine nacelle.

• Assembly and Packaging Lines: Managing complex sensor networks across long conveyor systems by safely ending local terminal nodes.

• Building Automation: Completing the communication bus segments for lighting, HVAC, and energy monitoring I/O blocks inside distribution panels.

• Automotive Test Benches: Providing clean data termination and separate power zones for sensitive data acquisition equipment used in vehicle testing.

Important Precautions

To avoid system communication failures and hardware damage, the following operational instructions must be followed:

• Mandatory Placement: Every operational Beckhoff terminal block must be completed on the right-hand side with a termination unit. Operating a system with an open bus structure will result in immediate communication errors and prevent the PLC from entering run mode.

• Power-Off Configuration: Never attach or slide a termination unit onto the DIN rail while the main bus coupler or power supply is energized. Hot-plugging can damage the delicate internal gold contacts.

• Current Limitation Overlap: When using a termination unit that doubles as a potential feed, ensure the total current passing through the power contacts does not exceed 10A. Exceeding this limit will cause localized overheating and distort the plastic housing.

• Voltage Level Segregation: If a termination unit is used to start a new power zone, confirm that the voltage level applied to the terminal points matches the rating of the adjacent I/O modules to prevent high-voltage leakage into low-voltage components.

• Environmental Protection: Ensure the unit is mounted within an enclosure that meets the environmental requirements of the application (typically IP20). Protect the open side of the terminal block from conductive dust, moisture, and corrosive vapors before the termination unit is locked into place.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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