Description
The Beckhoff EL4028 is an 8-channel EtherCAT analog output terminal designed for current signal generation in the 4…20 mA range. With 12-bit resolution, electrical isolation, and distributed clock synchronization, it provides precise and reliable current control in automation systems.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Beckhoff |
| Category |
I/O Terminals |
| Part Number |
EL4028 |
| Subcategory |
Analog Output Terminals |
| Number of Outputs |
8 |
| Signal Current |
4…20 mA |
| Power Supply |
24 V DC via power contacts |
| Load Resistance |
< 150 Ω |
| Resolution |
12 bit |
| Conversion Time |
~400 µs |
| Output Error |
< 0.1% (relative to end value) |
| Electrical Isolation |
500 V (E-bus/signal voltage) |
| Distributed Clocks |
Yes |
| Distributed Clock Precision |
< 1 µs |
| Special Features |
Watchdog with user-specific output ramp; user synchronization available |
| Current Consumption (Power) |
Typ. 50 mA |
| Current Consumption (E-bus) |
Typ. 100 mA |
| Bit Width in Process Image |
8 × 16-bit AO outputs |
| Operating Temperature |
-25…+60 °C |
| Storage Temperature |
-40…+85 °C |
| Relative Humidity |
95%, no condensation |
| EMC Compliance |
EN 61000-6-2 / EN 61000-6-4 |
| Housing Material |
Polycarbonate |
| Installation |
DIN rail 35 mm, EN 60715 with lock |
| Dimensions (W × H × D) |
12 mm × 100 mm × 68 mm |
| Protection Rating |
IP20 |
| Weight |
Approx. 60 g |
Information About EL4028
The EL4028 is part of Beckhoff’s EL series EtherCAT terminals, providing eight analog output channels for generating current signals in the 4…20 mA range. It integrates 12-bit resolution and fast 400 µs conversion times, ensuring accurate control for analog actuators and process devices. The terminal features electrical isolation, distributed clocks with sub-microsecond precision, and an optional watchdog function that allows user-defined safe output states. Compact in size and designed for DIN rail installation, the EL4028 is optimized for reliable and scalable analog signal generation in distributed automation systems.
Key Features:
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Eight Analog Output Channels: Provides 8 independent current outputs for precise control of actuators and process signals.
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Current Range 4…20 mA: Standard industrial signal range supports wide compatibility with automation equipment.
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High Accuracy and Resolution: 12-bit resolution with < 0.1% output error ensures reliable analog performance.
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Fast Response Time: Offers conversion times of ~400 µs for responsive signal updates in real-time applications.
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Distributed Clock Synchronization: Supports EtherCAT distributed clocks with < 1 µs precision for time-critical systems.
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Robust Electrical Isolation: 500 V isolation between the E-bus and signal voltage enhances system safety.
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Optional Watchdog Function: Provides user-specific ramped output values and safe-state behavior on communication loss.
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Compact DIN Rail Mounting: Slim 12 mm housing allows high-density installation in modular control setups.
The EL4028 delivers the reliability and precision required for accurate analog signal generation in EtherCAT-based automation systems.
