BECKHOFF EJ1889 EtherCAT Plug-in Module

Description

The EJ1889 is a 16-channel EtherCAT plug-in module designed for cost-optimized, modular machine concepts. This digital input terminal facilitates the acquisition of 24 V DC binary control signals from sensors and switches. Unlike standard modules, the EJ1889 features ground switching logic, where a signal "1" is represented by a voltage between 0 and 7 V DC, and a signal "0" corresponds to 18 to 30 V DC. It provides efficient integration into the EtherCAT system via the E-bus, with an internal current consumption of approximately 80 mA. The module is engineered for robustness, featuring 500 V electrical isolation between the E-bus and field potential to ensure signal integrity and protection in industrial environments.

Features

• 16 digital inputs for high-density signal acquisition
• Ground switching signal logic
• Low current consumption (typ. 80 mA) via E-bus
• Fast signal filtering (typ. 3.0 ms)
• 500 V electrical isolation (E-bus/field potential)
• Compact design (approx. 30 g) for space-constrained installations
• Wide operating temperature range: -25 to +60 Celsius

Applications

• Modular machine automation and I/O integration
• Distributed sensor signal acquisition
• Industrial control panels utilizing ground-switching sensor logic
• High-density digital signal processing in EtherCAT networks

Technical Specifications

Installation Guidelines

• Module Handling: Handle the EJ1889 by its edges to prevent ESD damage to the electronic components.
• Ground Switching Logic: Note that this module uses ground switching; ensure your field sensors are configured to pull the input to ground (0 V) to trigger a "1" signal.
• Environment: Ensure the installation area remains free of condensation. While the module supports a wide temperature range, provide adequate ventilation if multiple units are stacked closely.
• Isolation: The 500 V isolation protects the E-bus from field-side voltage spikes. Ensure proper grounding of the field potential to maintain effective noise immunity according to EN 61000-6-2.