Beckhoff EJ1889 – EtherCAT Plug-In Module, 16-Channel Digital Input, 24V DC, Ground Switching

The Beckhoff EJ1889 is an EtherCAT plug-in module. Specifically, this module acquires binary 24 V control signals from the process level. It then transmits these signals in an electrically isolated form to the higher-level automation unit. Furthermore, the module contains 16 channels with LED indication for each signal state. Consequently, this module suits applications requiring ground-switching digital inputs.

Ordering Configuration and Product Identification

• Product Status: Regular delivery.

• Product Type: EtherCAT plug-in module.

• Number of Inputs: 16 channels total.

• Nominal Voltage: 24 V DC (-15%/+20%).

• Input Current: Typical 3 mA.

• Input Filter: Typical 3.0 milliseconds.

• Special Features: Ground switching configuration.

• Electrical Isolation: 500 V between E-bus and field potential.

• Weight: Approximately 30 grams.

• Therefore, the Beckhoff EJ1889 provides compact ground-switching inputs for EtherCAT systems.

Ground Switching Input Specifications

• Specification: Ground switching configuration.

• "0" Signal Voltage: 18 to 30 V DC (high voltage = inactive).

• "1" Signal Voltage: 0 to 7 V DC (low voltage = active).

• Input Current: Typical 3 mA when active.

• Input Filter: 3.0 milliseconds typical.

• No Bouncing: Mechanical switches are debounced by the filter.

• Signal Indication: LEDs show channel states.

• Logic Type: Active low (ground switching) configuration.

• Application: Suits sensors that switch to ground.

• Thus, the EJ1889 is optimized for ground-switching field devices.

Current Consumption and Isolation

• Current Consumption (E-bus): Typical 80 mA.

• Electrical Isolation: 500 V between E-bus and field potential.

• Distributed Clocks: Not supported.

• Field Power: Provided via signal distribution board.

• Bit Width in Process Image: 16 inputs total.

• Configuration: No addressing required.

• Signal Transmission: Electrically isolated to automation unit.

• Therefore, the Beckhoff EJ1889 consumes minimal power while providing robust isolation.

Housing and Mechanical Data

• Design Form: EtherCAT I/O plug-in module.

• Material: Polycarbonate.

• Dimensions (W x H x D): 12 mm x 66 mm x 55 mm.

• Installation: On signal distribution board.

• Mechanical Coding: Signal-specific coding pins on housing.

• PCB Holes: Matching holes in the printed circuit board.

• Locking: Latching lug in circuit board cut-out.

• Connection Method (Field Wiring): Application-specific wiring level on signal distribution board.

• Module Connection: 2 x 20-pin socket strip.

• Protection Rating: IP20 (see documentation for installation position).

• Consequently, the EJ1889 mounts securely onto signal distribution boards.

Temperature and Environmental Ratings

• Operating Temperature: -25°C to +60°C.

• Storage Temperature: -40°C to +85°C.

• Relative Humidity: 95% maximum, no condensation.

• Vibration Resistance: Conforms to EN 60068-2-6.

• Shock Resistance: Conforms to EN 60068-2-27.

• EMC Immunity: Conforms to EN 61000-6-2.

• EMC Emission: Conforms to EN 61000-6-4.

• Installation Position: See documentation for specific orientation.

• Chemical Resistance: Avoid direct chemical exposure.

• Moreover, the Beckhoff EJ1889 withstands wide temperature ranges and industrial conditions.

Approvals and Certifications

• CE: Certified for European markets.

• UL: Certified for North American markets.

• EN 61000-6-2: Immunity compliance.

• EN 61000-6-4: Emission compliance.

• EN 60068-2-6: Vibration tested.

• EN 60068-2-27: Shock tested.

• ATEX: Not listed (standard industrial version).

• Hazardous Location: Not certified for explosive atmospheres.

• Therefore, the EJ1889 meets standard industrial certification requirements.

Installation Guide

First, verify that all system power sources are completely disconnected. Then, prepare your signal distribution board with the correct coding holes. The PCB must have matching cut-outs for the locking lugs. After that, align the Beckhoff EJ1889 with the 2 x 20-pin socket strip on the board. Push the module down firmly until the locking lugs engage. The mechanical coding pins prevent incorrect insertion. Then, connect your field wiring to the application-specific wiring level on the distribution board. Wire your ground-switching sensors to the appropriate input terminals. For active inputs ("1" signal), the voltage should be 0-7 V DC. For inactive inputs ("0" signal), the voltage should be 18-30 V DC. Then, connect the E-bus from the previous EtherCAT device. Apply 24 V DC power to the system through the distribution board. Finally, verify the 16 input LEDs indicate correct signal states. As a result, the Beckhoff EJ1889 will provide reliable ground-switching digital input acquisition.

Packaging List

• One Beckhoff EJ1889 EtherCAT plug-in module

• One 2 x 20-pin socket strip (installed)

• One product identification label

• One installation and configuration guide

• Mechanical coding pins (pre-installed on housing)

Common FAQs

Q1: How many input channels does the Beckhoff EJ1889 provide?
A: This plug-in module provides 16 digital input channels. Therefore, it suits high-density applications with many ground-switching sensors. The signal state of each channel is indicated by LEDs.

Q2: What is ground switching on the EJ1889?
A: Ground switching means the input is active when the signal is low (0-7 V DC). The inactive state is high (18-30 V DC). Consequently, this module works with sensors that switch to ground.

Q3: What is the input filter time on the Beckhoff EJ1889?
A: The typical input filter time is 3.0 milliseconds. Therefore, mechanical switch bounce is eliminated automatically. This simplifies wiring by removing external debouncing components.

Q4: How is the Beckhoff EJ1889 mounted?
A: This module mounts onto a signal distribution board. It uses 2 x 20-pin socket strips and locking lugs. Mechanical coding pins prevent incorrect insertion. Therefore, it is not a DIN-rail terminal.

Q5: What certifications does the EJ1889 hold?
A: This module is CE and UL certified. It conforms to EN 61000-6-2 and EN 61000-6-4 for EMC. Vibration and shock testing conform to EN 60068-2-6 and EN 60068-2-27. Therefore, it meets standard industrial requirements.