Moxa

EJS-08 Series

8-port industrial EtherCAT junctions

EJS-08 Series

Features and Benefits

  • 8 100BaseT(X) full-duplex RJ45 ports for multiple slave connections
  • Supports topology conversion for more flexible EtherCAT networks
  • Compact size for easy installation
  • Wide power input range with redundancy options
  • IP30-rated metal housing
  • Meets the EN 61000-6-2 and EN 61000-6-4 standards for industrial EMC applications
  • Supports DIN-rail grounding to optimize space and wiring

Certifications

  • CE
  • FCC
  • UL Listed

Introduction

Moxa’s EJS-08 Series EtherCAT junctions are equipped with 8 Fast Ethernet EtherCAT ports. These devices support star, line, ring, or tree topology conversion, enabling multiple EtherCAT devices to be connected in a modular and efficient manner. The EJS Series features a robust metal housing with high electromagnetic compatibility to shield against environmental inference while support for multiple grounding methods simplifies wiring and installation. The EJS Series supports a range of redundancy features to enhance the reliability and availability of EtherCAT networks. Topology conversion minimizes production line interruptions and improves troubleshooting efficiency. The dual power input design lets you connect a redundant power supply for non-stop availability in the event of a main power failure. Moreover, the EJS Series can be used in redundancy topologies to provide alternative data paths in case one data path fails, ensuring that the exchange of data is not interrupted. The EJS Series is certified for the EtherCAT Conformance Test by the EtherCAT Technology Group (ETG), meaning the EJS Series integrates into your existing network seamlessly, making the EJS Series ideal for use in any EtherCAT application.

Models in this series (2)

EJS-08EJS-08-T
100BaseT(X) Ports (RJ45 Connector)88
HousingMetalMetal
Operating Temperature-10 to 60°C-35 to 75°C
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Specifications

Shown for EJS-08. Per-model differences are listed in the selection grid above.

EtherCAT

FMMU
8
Sync Manager
8
Supported Topologies
Star Line Tree Ring
Interfaces
8 x 100BaseT(X) ports (RJ45 connector) Auto MDI/MDI-X connection

Switch Properties

Port Combination
1 (IN), 7 (OUT)
Port Delay
1 μs per port (approximately)

Rotary Switch Configuration

ID Selector
Valid address range: 1 to 4095

Power Parameters

Connector
1 removable 4-contact terminal block(s)
Input Current
0.30 A (max.)
Input Voltage
12/24/48 VDC
Operating Voltage
9.6 to 60 VDC
Overload Current Protection
Supported
Reverse Polarity Protection
Supported

LED Interface

LED Indicators
PWR1, PWR2, RUN

Physical Characteristics

Dimensions
43 x 100 x 75 mm (1.69 x 3.94 x 2.95 in)
Weight
340 g (0.75 lb)
Cable Length
100 m
Housing
Metal
Installation
DIN-rail mounting Wall mounting (with optional kit)

Environmental Limits

Operating Temperature
-10 to 60°C (14 to 140°F)
Ambient Relative Humidity
5 to 95% (non-condensing)
Storage Temperature (package included)
-40 to 85°C (-40 to 185°F)

Standards and Certifications

Safety
UL 61010-2-201 EN 62368-1
EMC
EN 55032/35 EN 61000-6-2/-6-4
EMI
CISPR 22/32, FCC Part 15B Class A
EMS
IEC 61000-4-2 ESD: Contact: 6 kV; Air: 8 kV IEC 61000-4-3 RS: 80 MHz to 1 GHz: 10 V/m IEC 61000-4-4 EFT: Power: 2 kV; Signal: 2 kV IEC 61000-4-5 Surge: Power: 2 kV; Signal: 2 kV IEC 61000-4-6 CS: 10 V IEC 61000-4-8 PFMF
Shock
IEC 60068-2-27
Vibration
IEC 60068-2-6 IEC 60068-2-64
Freefall
ISTA-1A (with package)

MTBF

Time
6,294,742 hrs
Standards
Telcordia (Bellcore), GB

Warranty

Warranty Period
5 years
Details
See www.moxa.com/warranty

Resources

NameTypeVersionDate
Software Package for EJS-08 Series (ESI file)8.8 KBSoftware Packagev1.0Feb 21, 2025 Feb 21, 2025 Release notes
QIG for EJS-04, EJS-08 Series3.2 MBQIGv1.1Dec 25, 2025
Datasheet for EJS-08 Series696.4 KBDatasheetv1.1Dec 05, 2025
Tech Note: Building a Fault-tolerant EtherCAT Network4.4 MBTech Notev1.0Aug 25, 2025
Declaration of Conformity for EJS-04/08 Series306.9 KBDeclarationv1.0Dec 25, 2024

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