Operating as a specialized interface within the Beckhoff I/O system, the Beckhoff ES2521 EtherCAT Terminal delivers precise pulse train signals for motion control applications. This high-performance module converts 16-bit velocity values from the automation controller into a highly accurate RS422 differential frequency output. Capable of generating base frequencies from 0 to 500 kHz, it is engineered to interface directly with stepper motor drivers, servo drives, and frequency converters that accept frequency/direction or pulse train control commands. The unit features built-in distributed clocks support for precise, synchronized operation across multi-axis networks, and incorporates a pluggable wiring design that simplifies field installation and cabinet maintenance.
| Parameter | Specification Value |
|---|---|
| Manufacturer | Beckhoff |
| Model Number | ES2521 |
| Connection Technology | Pulse train (frequency output) with pluggable wiring harness |
| Number of Channels | 1 channel (consisting of 2 differential outputs: A, B) |
| Digital Inputs | 2 inputs (+T Latch, +Z Gate) |
| Input Signal Voltage | 24 V DC |
| Output Signal Specification | RS422 levels, differential |
| Output Current Limit | Maximum 50 mA per channel (short-circuit proof) |
| Base Frequency Range | 0 to 500 kHz (Default configuration: 50 kHz) |
| Output Resolution | Max. 15 bit |
| Frequency Step Size | 10 mHz |
| Process Image Width | 14-byte output, 8-byte input |
| Current Consumption E-bus | Typically 280 mA (load-dependent) |
| Current Consumption Power Contacts | No current draw from external power contacts |
| Electrical Isolation | 500 V RMS (E-bus to field potential) |
| Operating Temperature | 0 to +55 degC |
| Storage Temperature | -25 to +85 degC |
| Relative Humidity | 95% non-condensing |
| Protection Rating | IP20 |
| Hazardous Location Approvals | ATEX: II 3 G Ex ec IIC T4 Gc, IECEx: Ex ec IIC T4 Gc |
| Net Weight | Approximately 50 g |
| Shipping Weight (Calculated) | 2.0 kg |
| Terminal Connection Point | Signal Assignment | Description |
|---|---|---|
| Pin 1 | Output A | Non-inverted differential output channel A (Pulse / Frequency) |
| Pin 5 | Output /A | Inverted differential output channel A |
| Pin 2 | Output B | Non-inverted differential output channel B (Direction) |
| Pin 6 | Output /B | Inverted differential output channel B |
| Pin 3 | Input +T | Latch input (24 V DC) for high-speed hardware position capture |
| Pin 7 | Input +Z | Gate / zero input (24 V DC) for axis reference calibration |
| Pin 4 | +24 V DC | Control power supply input for the digital logic |
| Pin 8 | 0 V DC (GND) | Reference potential for inputs and external drive circuits |
The ES2521 and the EL2521 share identical process images, register configurations, and TwinCAT device descriptions. The sole distinction lies in the physical connector style: the ES2521 features a pluggable wiring block, enabling off-terminal wire terminations and swift physical component replacement, whereas the EL2521 incorporates standard direct-in push-in termination. System integrators can seamlessly interchange the modules in TwinCAT without requiring configuration modifications, provided the plug-in connector harness is deployed.
A key layout consideration is the high internal E-bus current consumption of the module. Consuming 280 mA typical from the communication backplane, the ES2521 is highly power-intensive. When constructing an EtherCAT segment containing multiple high-draw interfaces, the aggregate current must not exceed the maximum supply capability of the coupler (often capped at 2000 mA). If the E-bus power budget is breached, intermittent communication drops or localized terminal failures will manifest. Insert a dedicated power feed terminal (such as the EL9400 or EL9410) directly upstream of the module to resolve backplane load issues.
To protect signal integrity up to the full 500 kHz switching threshold, always employ shielded, twisted-pair cabling for the A/A and B/B differential lines. For optimal electromagnetic compatibility, terminate the cable shields as close as possible to the terminal entry point inside the enclosure using functional earth grounding clamps. Unshielded runs or running signal lines in parallel with motor power outputs will induce electrical noise, resulting in positioning inaccuracies or cumulative pulse count slippage over extended operational cycles.
CRITICAL WARNING
Isolate all electrical power sources supplying the DIN rail assembly and field devices before commencing terminal installation or removal. Working under active voltage introduces short-circuit risks that can destroy the precision logic cards on the E-bus and permanently damage connected motor control inputs.
Verify that the selected terminal segment provides sufficient E-bus power capacity, accounting for the module's baseline 280 mA rating.
Securely latch the terminal housing onto the 35 mm DIN rail (EN 60715) ensuring the side E-bus slide contacts mate flush with the neighboring unit.
Pre-wire the pluggable wiring block with the appropriate conductor cross-sections (0.08 to 2.5 mm2) before snapping the connector plug firmly into the module socket.
Energize the backplane power supply and activate TwinCAT to scan for the new terminal, applying necessary axis-control parameters via the configuration tree.
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Returns & Warranty
Manufacturer: BECKHOFF
Product No.: ES2521
Country of origin:Germany
Product Type: EtherCAT Terminals
Payment: T/T, Western Union
Weight: 500g
Shipping port: Xiamen
Warranty: 12 months
Operating as a specialized interface within the Beckhoff I/O system, the Beckhoff ES2521 EtherCAT Terminal delivers precise pulse train signals for motion control applications. This high-performance module converts 16-bit velocity values from the automation controller into a highly accurate RS422 differential frequency output. Capable of generating base frequencies from 0 to 500 kHz, it is engineered to interface directly with stepper motor drivers, servo drives, and frequency converters that accept frequency/direction or pulse train control commands. The unit features built-in distributed clocks support for precise, synchronized operation across multi-axis networks, and incorporates a pluggable wiring design that simplifies field installation and cabinet maintenance.
| Parameter | Specification Value |
|---|---|
| Manufacturer | Beckhoff |
| Model Number | ES2521 |
| Connection Technology | Pulse train (frequency output) with pluggable wiring harness |
| Number of Channels | 1 channel (consisting of 2 differential outputs: A, B) |
| Digital Inputs | 2 inputs (+T Latch, +Z Gate) |
| Input Signal Voltage | 24 V DC |
| Output Signal Specification | RS422 levels, differential |
| Output Current Limit | Maximum 50 mA per channel (short-circuit proof) |
| Base Frequency Range | 0 to 500 kHz (Default configuration: 50 kHz) |
| Output Resolution | Max. 15 bit |
| Frequency Step Size | 10 mHz |
| Process Image Width | 14-byte output, 8-byte input |
| Current Consumption E-bus | Typically 280 mA (load-dependent) |
| Current Consumption Power Contacts | No current draw from external power contacts |
| Electrical Isolation | 500 V RMS (E-bus to field potential) |
| Operating Temperature | 0 to +55 degC |
| Storage Temperature | -25 to +85 degC |
| Relative Humidity | 95% non-condensing |
| Protection Rating | IP20 |
| Hazardous Location Approvals | ATEX: II 3 G Ex ec IIC T4 Gc, IECEx: Ex ec IIC T4 Gc |
| Net Weight | Approximately 50 g |
| Shipping Weight (Calculated) | 2.0 kg |
| Terminal Connection Point | Signal Assignment | Description |
|---|---|---|
| Pin 1 | Output A | Non-inverted differential output channel A (Pulse / Frequency) |
| Pin 5 | Output /A | Inverted differential output channel A |
| Pin 2 | Output B | Non-inverted differential output channel B (Direction) |
| Pin 6 | Output /B | Inverted differential output channel B |
| Pin 3 | Input +T | Latch input (24 V DC) for high-speed hardware position capture |
| Pin 7 | Input +Z | Gate / zero input (24 V DC) for axis reference calibration |
| Pin 4 | +24 V DC | Control power supply input for the digital logic |
| Pin 8 | 0 V DC (GND) | Reference potential for inputs and external drive circuits |
The ES2521 and the EL2521 share identical process images, register configurations, and TwinCAT device descriptions. The sole distinction lies in the physical connector style: the ES2521 features a pluggable wiring block, enabling off-terminal wire terminations and swift physical component replacement, whereas the EL2521 incorporates standard direct-in push-in termination. System integrators can seamlessly interchange the modules in TwinCAT without requiring configuration modifications, provided the plug-in connector harness is deployed.
A key layout consideration is the high internal E-bus current consumption of the module. Consuming 280 mA typical from the communication backplane, the ES2521 is highly power-intensive. When constructing an EtherCAT segment containing multiple high-draw interfaces, the aggregate current must not exceed the maximum supply capability of the coupler (often capped at 2000 mA). If the E-bus power budget is breached, intermittent communication drops or localized terminal failures will manifest. Insert a dedicated power feed terminal (such as the EL9400 or EL9410) directly upstream of the module to resolve backplane load issues.
To protect signal integrity up to the full 500 kHz switching threshold, always employ shielded, twisted-pair cabling for the A/A and B/B differential lines. For optimal electromagnetic compatibility, terminate the cable shields as close as possible to the terminal entry point inside the enclosure using functional earth grounding clamps. Unshielded runs or running signal lines in parallel with motor power outputs will induce electrical noise, resulting in positioning inaccuracies or cumulative pulse count slippage over extended operational cycles.
CRITICAL WARNING
Isolate all electrical power sources supplying the DIN rail assembly and field devices before commencing terminal installation or removal. Working under active voltage introduces short-circuit risks that can destroy the precision logic cards on the E-bus and permanently damage connected motor control inputs.
Verify that the selected terminal segment provides sufficient E-bus power capacity, accounting for the module's baseline 280 mA rating.
Securely latch the terminal housing onto the 35 mm DIN rail (EN 60715) ensuring the side E-bus slide contacts mate flush with the neighboring unit.
Pre-wire the pluggable wiring block with the appropriate conductor cross-sections (0.08 to 2.5 mm2) before snapping the connector plug firmly into the module socket.
Energize the backplane power supply and activate TwinCAT to scan for the new terminal, applying necessary axis-control parameters via the configuration tree.
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
Germany
|
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