Replacing a Beckhoff EL4032: Wiring and Output Checks
A field checklist for replacing a Beckhoff EL4032, covering the ±10 V load, terminal map, power contacts, EtherCAT state, and watchdog behavior.
Manufacturer: BECKHOFF
Product No.: EP9128-0021
Country of origin:Germany
Product Type: EtherCAT Junction Boxes
Payment: T/T, Western Union
Weight: 300g
Dimensions: 60 mm x 126 mm x 26.5 mm
Shipping port: Xiamen
Warranty: 12 months
The BECKHOFF EP9128-0021 is an 8-port EtherCAT junction module designed for branching EtherCAT topologies in demanding industrial environments. This EtherCAT Box enables the configuration of flexible line, star, or tree topologies directly in the field, reducing cabling overhead and eliminating the need for protective control cabinets. It distributes the EtherCAT signal to up to eight separate junctions using standard shielded M8 connections.
Housed in a compact, polyamide enclosure, the BECKHOFF EP9128-0021 offers excellent environmental resistance with an IP65/66/67 rating. Its decentralized design supports high-speed industrial data transfer up to 100 Mbit/s with a minimal propagation delay of approximately 1 microsecond per port. This makes it suitable for complex machine configurations where fieldbus nodes are widely distributed.
| Parameter | Specification |
|---|---|
| System and Communication | |
| Protocol | EtherCAT |
| Task within System | Coupling of EtherCAT junctions |
| Data Transfer Rate | 100 Mbit/s |
| Delay Time | Approx. 1 microsecond per port |
| Data Transfer Medium | Ethernet/EtherCAT cable (minimum Category 5), shielded |
| Distance Between Stations | Maximum 100 meters (100BASE-TX) |
| Electrical Requirements | |
| Nominal Power Supply | 24 V DC (-15% / +20%) |
| Current Consumption (24 V DC) | Approx. 150 mA |
| Physical and Connection Details | |
| Bus Interface | 8 x M8 sockets, shielded, screw type |
| Connection Method | M8, screw type, 4-pin |
| Dimensions (W x H x D) | 60 mm x 126 mm x 26.5 mm |
| Enclosure Material | PA6 (polyamide) |
| Weight | Approx. 300 g |
| Environmental and Compliance | |
| Operating Temperature Range | -25 to +60 Celsius |
| Storage Temperature Range | -40 to +85 Celsius |
| Protection Rating | IP65, IP66, IP67 (conforms to EN 60529) |
| 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 |
| Approvals and Markings | CE, UL |
| Interface Type | Function |
|---|---|
| 8 x M8 Sockets (Screw-type, 4-pin) | Shielded EtherCAT junction ports for incoming and outgoing communication paths |
| Power Supply Connections | Fieldside feed-in for logic and sensor power supply |
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Returns & Warranty

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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
|