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
Feature
Specification
Manufacturer
BECKHOFF
Part Number
EJ1889
Number of Inputs
16
Nominal Voltage
24 V DC (-15 %/+20 %)
"0" Signal Voltage
18…30 V
"1" Signal Voltage
0…7 V
Input Current
typ. 3 mA
Input Filter
typ. 3.0 ms
E-bus Current Consumption
typ. 80 mA
Electrical Isolation
500 V (E-bus/field potential)
Operating Temperature
-25 to +60 Celsius
Storage Temperature
-40 to +85 Celsius
Protection Rating
IP20
Weight
approx. 30 g
Shipping Weight
2 kg
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.
FAQ
What is the signal logic for the EJ1889?
The EJ1889 uses ground switching logic: a '1' signal is 0–7 V DC, and a '0' signal is 18–30 V DC.
How many inputs does this terminal have?
The EJ1889 provides 16 digital input channels.
Does this module require a separate power supply for the E-bus?
No, the module consumes its E-bus power directly from the EtherCAT system (typ. 80 mA).
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