BECKHOFF EL9xxx series EtherCAT system terminal

BECKHOFF EL9xxx series EtherCAT system terminal

Classification, functions, and parameters of the entire product series

EL9xxx is an IP20 passive terminal that is uniformly compatible with 35mm standard DIN rails. It can operate at normal temperatures (0-55 ℃) and wide temperatures (-25~60 ℃), with a storage temperature of -40~85 ℃ and a relative humidity of ≤ 95% (no condensation). The entire series has passed certifications such as CE, EAC, UKCA, ATEX, IECEx, and cULus. Divided by function into seven categories: terminal, isolation, shielding, power supply, potential distribution, lightning protection filtering, and buffer capacitor.

（1） Terminal/Isolation Terminal

1. EL9011/EL9012 bus terminal cap

Function: EtherCAT terminal group is a necessary terminal device at the end, ensuring ESD protection and bus impedance matching, without communication/IO points.

Basic parameters: size 8 × 100mm, weight 8/10g, E-bus electrically isolated from on-site potential of 500V.

2. EL9080 potential isolation terminal

Core function: Cut off the internal power contacts of the terminal block, keep the E-bus signal straight, and use it to distinguish multiple different voltage circuits in the same terminal group (such as 24VDC/230VAC mixed use scenarios).

Appearance features: The orange panel serves as an isolation label, with no wiring terminals or diagnostic functions.

（2） Shielded terminal

1. EL9070 shielded terminal

Integrated with 8 shielded connection points, the shell is connected to the DIN rail, and electromagnetic shielding and interference discharge are achieved using large-area copper material. The maximum current carrying capacity is 10A, and it is suitable for grounding various shielded cables.

2. EL9195 shielding+power through terminal

It has both shielded wiring and direct power contact function, with 8 wiring points that can be connected to the shielding layer, and can also connect the positive and negative power circuits. The voltage support is up to 230V AC/DC, and the EMC anti-interference ability is enhanced.

（3） Universal power supply feeding terminal

Used for replenishing power and dividing new potential groups in the terminal block, with built-in power contacts and partial support for diagnosis, with a maximum rated current of 10A.

EL9100 (24VDC): Basic 24V power supply, green power indicator light, no diagnosis.

EL9110 (24VDC with diagnosis): Similar to EL9100, it has added a voltage diagnostic position and TwinCAT can read the PowerOK status.

EL9150 (230VAC): AC power supply, supports 120/230V power grid, power indicator light.

EL9160 (230VAC with diagnosis): AC version with voltage diagnosis, process word output status.

EL9190 (Universal): Voltage adaptive, supporting up to 230V AC/DC, with universal feeding for both AC and DC.

（4） Power supply feeding terminal with fuse

Built in 6.3A thin fuse, overload automatic protection, distinguishing between DC and AC models, some with fuse diagnosis:

EL9200:24VDC fuse feeding, power supply+fault dual indicator light.

EL9210：24VDC， Dual diagnosis of fuse and voltage, PLC can read PowerOK and FuseError signals.

EL9250:230VAC fuse feeding.

EL9260：230VAC， Equipped with voltage and fuse dual diagnosis.

EL9290: AC/DC universal fuse terminal, maximum 230V AC/DC.

（5） Potential distribution terminal (high-density distribution line)

Function: Expand the power distribution point, eliminate additional wiring terminals, and be divided into ordinary and high-density HD models. The maximum voltage is ≤ 60VDC, and the maximum single channel is 10A.

EL9180: Basic distribution line, multiple power outlet points.

EL9181/9182/9183: HD high-density model, providing 2 sets of independent potentials, 8 sets of independent potentials, and 16 single potential contacts.

EL9184/9185/9185-0010: Multi channel grouping and distribution line, EL9185-0010 supports re feeding and can create new potential groups.

EL9186/9187: dedicated to+24V and 0V distribution lines respectively.

EL9188/9189:16 high-density distribution lines, all at+24V and all at 0V.

（6） E-bus power supply terminal

EL9400/EL9410: Specially designed for supplying power to the E-bus bus, with an additional output of 2A current per channel, solving the problem of insufficient power supply to the long terminal string E-bus.

EL9400: Basic model, dual power indicator light (E-bus/on-site power);

EL9410: Equipped with undervoltage diagnosis, it reports an error when the two voltages are below 17V, and supports dual alarms of LED+TwinCAT process words.

（7） Surge filter terminal

Used in harsh working conditions (outdoor, marine, inductive loads, lightning strike areas) to suppress surges and induced overvoltages, divided into two types: system power supply and on-site power supply:

EL9540/EL9540-0010: Only protects the on-site 24V power supply, the latter has overvoltage/undervoltage diagnosis and is compatible with analog modules.

EL9550/EL9550-0010/EL9550-0012: Simultaneously protect the system and provide two on-site power supplies. EL9550-0012 enhances current carrying capacity and is compatible with high current devices such as embedded PCs; Some models have been certified by classification societies.

（8） Buffer capacitor terminal

EL9570: Built in 500 μ F high-voltage buffer capacitor with a withstand voltage of 50V, used for servo, stepper and other driving circuits.

Function: Absorb regenerated electrical energy from the motor, suppress voltage spikes, and avoid overvoltage damage to the module;

Supporting: It can be equipped with an external 10 Ω/10W discharge resistor, and the indicator light will light up when overloaded, suitable for motion control workstations.

Communication Fundamentals

1. EtherCAT hardware link

Cable requirements: Minimum Cat5 Ethernet cable, using 1/2/3/6 four core wires, RJ45 interface automatically recognizes straight/cross lines, maximum cable length between devices is 100m.

E-bus rule: The bus coupler defaults to outputting 5V/2A E-bus current; If the terminal string is too long or there are too many modules, EL9400/EL9410 must be inserted for power supply. TwinCAT can calculate the total load of E-bus online.

Passive terminal layout restrictions: Continuous installation of no more than 2 passive terminals is allowed, otherwise it will affect the quality of the E-bus signal.

2. EtherCAT State Machine (ESM)

The entire series of terminals follow five standard operating states:

Initialize: No communication;

Pre op: only email communication, configuration parameters;

Safe op: The process data is normal and the output is locked in a safe state;

Op (Running): Fully functional and in normal working condition;

Boot: Only used for firmware updates, disable regular communication.

3. CoE interface description

Most of the passive terminals in this series do not have CoE parameters;

The diagnostic model can read status, version, and fault information through the CoE object dictionary (addresses 0x1000, 0x8000, etc.);

Parameter modification can be achieved through TwinCAT or PLC function blocks, supporting offline/online configuration, and a startup list can be set to prevent parameter loss after device replacement.

EEPROM has a write life limit, and it is recommended to enable the NoCoeStorage function for high-frequency rewriting.

Installation, wiring and specifications

1. General installation requirements

Rail: compatible with EN 60715 standard 35mm DIN rail, divided into two types: 7.5mm/15mm.

Installation posture: Priority should be given to horizontal installation to ensure adequate ventilation space above and below; Reserve larger heat dissipation gaps for high load modules.

Mechanical reinforcement: In vibration/impact scenarios, the distance between the fixed points of the guide rail is ≤ 5cm; the maximum number of 12mm terminals per section is 64, and the maximum number of 24mm terminals per section is 32.

Disassembly and assembly: The entire machine must be powered off, and the orange unlocking buckle must be pulled to remove the terminal. Violent insertion and removal are prohibited.

Electrostatic Discharge (ESD): Release static electricity from the human body before operation, and do not touch the contact points; EL9011/9012 terminal caps must be installed at the end of the terminal group.

2. Explosion proof special specifications (ATEX/IECEx/cFMus)

Installation requirements for explosion-proof areas: The entire machine should be installed in cabinets with an IP54 rating or higher; Dust scenes are upgraded in protection according to their levels.

Voltage limit: The instantaneous overvoltage shall not exceed 40% of the rated value; The temperature resistance of the cable needs to match the temperature of the connection point.

Operation restrictions: Terminal insertion and removal, code adjustment, and fuse replacement can only be carried out after power failure in the explosion-proof area.

Certification mark: Distinguish the explosion-proof level of gas and dust, and mark the corresponding Ex mark on the product nameplate.

3. Wiring specifications

Power supply standard: SELV/PELV safety ultra-low voltage must be used.

Terminal block type:

Standard EL/KL series: Spring terminal, screwdriver press to open the hole and plug in the wire;

HD high-density terminal: Single core wire can be inserted directly without the need for tools.

Wire diameter and stripping length:

Conventional terminal: 0.08~2.5mm ², stripped wire of 8~10mm;

HD terminal: 0.08~1.5mm ², compatible with corresponding specifications for fine wire/wire nose.

Shielded wiring: Analog and encoder cables must use shielded twisted pair cables, with the shielding layer connected to EL9070/EL9195.

Insulation test: Disconnect the PE protective ground before testing to avoid damaging the device.

4. Potential group planning

The EL9080 isolation terminal is used to divide different voltage circuits, and it is strictly prohibited to share power contacts for different voltages.

Multiple feeding terminals can be used in conjunction to divide multiple independent potential zones within a terminal block.

Indicator lights and diagnostic functions

1. Definition of general indicator lights

Power light (green): constantly on=corresponding voltage is normal, off=no input;

Fault light (red): It lights up when the fuse is blown, under voltage, or surge fault occurs;

RUN running light: flashes at different frequencies, corresponding to the five EtherCAT state machines.

2. Diagnostic signals

Diagnostic terminals (EL9110, EL9210, EL9410, EL9540, etc.) will generate corresponding points in the TwinCAT process image:

PowerOK: The power supply is in normal condition;

FuseError: Fuse failure;

Undervoltage: undervoltage alarm;

Overvoltage: Overvoltage alarm.

Configuration, maintenance, and scrapping

Configuration: All passive terminals in the series do not require address configuration, and can be recognized by TwinCAT upon power on. Only the diagnostic bit needs to be read.

Firmware: This series is passive hardware, without firmware, and does not require upgrading.

Daily maintenance: Regularly clean dust, check wiring fastening, and check the status of indicator lights; Explosion proof/outdoor equipment should undergo cable aging inspection.

Scrap: According to local electronic waste regulations, it should be recycled and cannot be discarded at will.