EL6695

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The EL6695 EtherCAT Terminal features two channels, electrical isolation between interfaces, LED status indicators for link/activity and error, and a compact design with dimensions of 12 mm width, 100 mm height, and 68 mm depth. Part of the EL EtherCAT Terminals series by Beckhoff, it supports DIN-rail mounting.

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Product Description:

The EL6695 from Beckhoff fits into the EL EtherCAT Terminal product series for flexible network bridging. This commercial module passes through permitted temperatures from –25 °C to +85 °C for storage that protects against shipment and storage cold. It is rated as IP20 class and safeguards within the control cabinet to protect against solid contaminants greater than 12 mm in size. It draws power of approximately 280 mA from the E-bus due to the minimal upstream power requirements.

By removing the need for discrete power feeds, this advanced terminal receives supply voltage through the E-bus, thereby simplifying the wiring process. Its dimensions are 24 mm × 100 mm × 70 mm to accommodate narrow DIN-rail openings. It is lightweight, having approximately 110 g mass, which facilitates transportation and reduces rail burden. The component mounts directly on standard DIN rails to speed panel assembly. It uses LEDs for link/activity and error status and delivers immediate operational feedback. The unit serves like a bridge terminal for EtherCAT, which is designed to connect various network segments to facilitate distributed control. Additionally, it provides 2 EtherCAT channels, which improve the redundancy or branching capabilities of the network.

Real-time communication is maintained by the EL6695's connection to the EtherCAT protocol-based data forwarding. It provides EtherCAT interfaces on both primary and secondary sides and further supports seamless daisy-chaining. It ensures electrical isolation between interfaces to prevent ground-loop interference. Working in between 0°C to +55°C temperature, the module maintains efficiency and can handle up to 3 kByte of process data per direction, thereby accommodating large I/O sets. It allows 80 mA at 24 V on the secondary port for minimizing additional power supply demands. The EL6695 comes with the compact size and robust bridging for efficient EtherCAT segmentation.

Connection
EtherCAT on both sides (primary and secondary)
Data Transfer
EtherCAT protocol-based data forwarding
Dimensions
Width: 12 mm, Height: 100 mm, Depth: 68 mm
Housing Material
Plastic
Interface
EtherCAT
Isolation
Electrical isolation between interfaces
Mounting
DIN-rail mountable
Number Of Channels
2
Permissible Ambient Temperature
0...55 °C
Power Supply
Supplied via the E-bus
Protection Rating
IP20
Status Indicators
LEDs for link/activity and error
Weight
Approx. 70 g
Symptom / LED pattern Likely cause First things to check / corrective steps
No LEDs on either side after power-up No 24 V via E-Bus, or secondary RJ-45 side not supplied Measure E-Bus 5 V/24 V, supply the RJ-45 side with an auxiliary 24 V as described in the manual.
RUN LED off (primary) while other slaves are RUN Bridge still in PRE-OP/SAFE-OP In TwinCAT set the EL6695 to Run; check that the CoE object 0x1C12 (Rx PDO mapping) is valid.
ERROR LED red, 2 Hz flashing Frame Check-sum or link error Replace/shorten patch cord; verify Cat-5e/6 cabling and correct TX/RX pairs.
LINK LED dark on one RJ-45 socket Physical link lost on that side Check plug latching, patch cable and switch-port; confirm link LEDs on the partner device.
Both sides RUN, but process data invalid Mismatch in PDO length/structure Compare the PDO length in each master; harmonise CoE object 0x1600/0x1A00 lists on both sides.
Sync error in TwinCAT task Distributed-Clock (DC) domains not aligned Enable DC on both masters and set one domain as “Reference Clock” so the bridge can cross-sync.
FoE / EoE file transfer fails Bridge throughput or firewall limitation Reduce packet size, disable Windows firewall for test, use the higher-bandwidth EL6695 (vs EL6692).
Bridge stays in INIT after download Firmware/device ID not recognised by master Update TwinCAT device description (XML) to current version that contains EL6695 profile.
Extended cycle-time jitter on secondary strand Masters not tick-synchronised Configure identical cycle times and activate “DC in sync with ref-clock” for both masters.
Hot-connect strand not visible Secondary side lacks power during hot-plug Provide 24 V via KL9400 or similar to the RJ-45 strand so the bridge logic remains powered.
Beckhoff EL terminal Main purpose Ports / channel(s) Max process-data (cyclic) Typical use-case
EL6695 Real-time data exchange & DC sync between two EtherCAT segments with different masters 2 × RJ-45 (primary / secondary) 4 KB each direction (CoE-configurable) High-throughput bridge between CNC & robot controllers.
EL6692 Earlier EtherCAT-bridge version 2 × RJ-45 512 bytes each way Legacy systems, lower bandwidth needs.
EL6601 One-port Ethernet switch to tap TCP / UDP traffic from EtherCAT 1 × RJ-45 line-speed Ethernet Connecting an HMI, vision camera or PLC to an EtherCAT strand.
EL6652 Scanner for up to 16 EtherNet/IP slaves 2-port switched RJ-45 1 KB IN / 1 KB OUT Integrating drives, I/O blocks or barcode readers that speak EtherNet/IP.
EL6731 Full PROFIBUS-DP master 1 × D-sub 9-pin 244 bytes IN / 244 bytes OUT Migrating existing PROFIBUS field devices into an EtherCAT system.
EL6751  CANopen interface switchable master/slave 1 × Sub-D 9-pin 512 bytes PDO total Servo drives, weigh-scales or sensors on CANopen branches.
AL status / error code Meaning (according to Beckhoff InfoSys)
0x0012 Unknown requested state change (master asked for an illegal state)
0x0014 No valid firmware – device stays in BOOT/INIT until firmware is flashed 
0x0017 Invalid Sync-Manager configuration detected during transition PRE-OP → SAFE-OP/OP 
0x001A Synchronisation error (DC clock not in tolerance) 
0x001B Sync-Manager watchdog – process-data watchdog expired 
0x001C Invalid output configuration (PDO size/type mismatch) 
0x001E Invalid SM IN configuration – input PDOs not accepted 
0x001F Invalid PDO mapping (length or type wrong)
0x002C Fatal Sync error – Sync signal lost after cable/CRC fault
0x0004 Slave in SAFE-OP + Error (general error acknowledged) – check preceding code for root cause 

Frequently Asked Questions about EL6695:

Q: How does the EL6695 bridge two EtherCAT networks?

A: The EL6695 copies process data across its two channels which enables seamless network branching. It preserves distributed clock synchronization on both sides.

Q: What advantage do the Beckhoff's EL6695 LEDs provide?

A: These LEDs for link/activity and error status deliver instant diagnostics, eliminating the need for separate monitoring tools.

Q: How does IP20 protection affect the EL6695’s deployment?

A: The EL6695’s IP20 rating guards against solid objects larger than 12 mm which preserves internal components. It allows natural convection cooling to maintain thermal stability.

Q: What cabling does the EL6695 require for data transfer?

A: The EL6695 uses standard EtherCAT cables which leverage existing infrastructure. It avoids proprietary wiring for network bridging.

Q: Can this terminal operate in severe ambient conditions?

A: It works between 0 °C and +55 °C which suits factory-floor climates. It also tolerates storage down to –25 °C which protects it during transport.


Internal Product Review

  • ‘‘The EL6695’s dual EtherCAT channels support seamless network redundancy which prevents communication loss. Its LED indicators for link, activity, and error status simplify fault isolation without tools. The terminal’s E-bus power supply removes extra wiring which reduces panel complexity. ’’

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