Product Overview

The Beckhoff EL5021 is a 1-channel encoder interface EtherCAT terminal. This terminal connects directly to SinCos encoders with 1 VPP differential output. It evaluates input frequencies up to 250 kHz. The terminal provides 5V DC power to the encoder via connection points. A differential 1 VPP signal includes A, A̅ (inverted), B, B̅, C, and C̅ inputs. The terminal processes analog input signals and interpolates them into 32-bit count values. High-precision EtherCAT distributed clocks (DC) enable synchronous encoder reading.

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Part Number Breakdown (Tree Structure)

• EL → Product Series
  • EtherCAT Terminal
  • Beckhoff automation system
• 5021 → Specific Model
  • 1-channel encoder interface
  • SinCos 1 VPP signal type
  • Differential inputs

Key Specifications

• Brand: Beckhoff
• Part Number: Beckhoff EL5021
• Technology: SinCos encoder interface for differential 1 VPP signal
• Number of Channels: 1 channel
• Encoder Connection: A, A̅, B, B̅, C, C̅ (differential inputs)
• Encoder Operating Voltage: 5 V DC at max 0.5 A (from 24V power contacts)
• Nominal Voltage: 24 V DC via power contacts
• Electrical Isolation: 500 V (E-bus to field potential)

Counter and Resolution Specifications

• Counter Size: Up to 24 bits (adjustable)
• Interpolation Resolution: Up to 13 bits (8192 steps per sine period)
• Count Value Composition: Whole periods (max 24 bits) + value within one sine period (max 13 bits)
• Input Frequency: 250 kHz maximum at 10-bit resolution (sampling rate 70 MHz)

Distributed Clocks and Synchronization

• Distributed Clocks (DC): Yes, supported
• Synchronous reading of encoder values with other input data
• High-precision EtherCAT distributed clocks for synchronization
• Encoder profiles enable fast linking to motion control applications

Special Features

• Latch function for capturing counter values
• Reset (zero) counter via C track (reference mark)
• Change counting direction capability
• Store counter value separately
• Lock counter function
• Amplitude error detection of input signals
• Frequency error detection of input signals
• Integrated frequency measurement (frequency counter up to 24 bits)
• Frequency-dependent period resolution

Power Supply

• Encoder Power Supply: 5 V DC generated from 24V power contacts
• Maximum Encoder Current: 0.5 A
• Current Consumption (Power Contacts): 50 mA typical plus load
• Current Consumption (E-bus): 120 mA typical
• Maximum Current Load Power Contacts: 10 A

Diagnostic Capabilities

• Amplitude error detection for input signal monitoring
• Frequency error detection for input signal monitoring
• Integrated frequency measurement for speed feedback
• Signal status LEDs for visual indication

Environmental Specifications

• Operating Temperature: 0°C to +55°C
• Storage Temperature: -25°C to +85°C
• Relative Humidity: 95% maximum (non-condensing)
• 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
• Protection Rating: IP20
• Installation Position: Variable

Ex Approval and Markings

ATEX Approval:

• II 3 G Ex nA IIC T4 Gc

Other Approvals:

• CE
• UL

Housing and Physical Data

• Design Form: Compact terminal housing with signal LEDs
• Material: Polycarbonate
• Width: 12 mm
• Height: 100 mm
• Depth: 68 mm
• Weight: Approx. 55 g (0.06 kg)

Mounting and Installation

• Mount on 35 mm DIN rail (EN 60715 standard).
• Locking mechanism secures terminal to rail.
• Side by side mounting via double slot and key connection.
• Marking using BZxxx series labeling system.
• Pluggable wiring for all ESxxxx terminals (ES5021 version).

Wiring Specifications

Conductor Types and Cross-Sections (EL5021):

• Solid wire (s): 0.08 to 2.5 mm²
• Stranded wire (st): 0.08 to 2.5 mm²
• With ferrule (f): 0.14 to 1.5 mm²

AWG Cross-Sections (EL5021):

• Solid wire (s): AWG 28 to 14
• Stranded wire (st): AWG 28 to 14
• With ferrule (f): AWG 26 to 16

Termination Details:

• Stripping length: 8 to 9 mm
• Spring actuation using screwdriver

Installation Guide

• Turn off all power before installation.
• Mount the DIN rail securely in your control cabinet.
• Clip the Beckhoff EL5021 onto the DIN rail.
• Push the terminal to the right until it locks.
• Connect 24V DC power to the power contacts.
• Wire encoder signals to A, A̅, B, B̅, C, C̅ terminals.
• Use twisted pair shielded cable for differential signals.
• Connect encoder operating voltage to 5V and GND terminals.
• Insert wires into spring terminals using a screwdriver.
• Apply E-bus power and check encoder power LED.

Wiring Notes

• Use shielded twisted pair cable for each differential pair.
• Connect cable shield to ground at one end only.
• Keep encoder cable length as short as possible.
• Do not exceed 0.5 A encoder current draw.

Maintenance Tips

• Check LED status during normal operation.
• Monitor amplitude error for signal quality issues.
• Monitor frequency error for encoder health.
• Inspect terminal connections for tightness annually.
• Keep terminal free from dust and moisture.
• Ensure ambient temperature stays below 55°C.

Troubleshooting Tips

• If encoder does not count, check 5V encoder power.
• Verify differential signal amplitude is 1 VPP.
• Check wiring of A, A̅, B, B̅, C, C̅ signals.
• If amplitude error occurs, check cable shield and ground.
• If frequency error occurs, check encoder speed range.
• Use TwinCAT software to monitor diagnostic bits.

Typical Applications

• High-resolution position feedback for servo drives
• Linear motor position control with SinCos scales
• Rotary encoder interface for motion control
• Precision measurement and inspection systems
• Printing press registration control
• Machine tool spindle positioning
• Hazardous area encoder applications (ATEX Zone 2)

Package Contents

• One Beckhoff EL5021 EtherCAT encoder terminal
• One product label
• Encoder cable and wiring accessories not included

Warranty and Shipping

• 12 months factory warranty from shipment date.
• Warranty covers manufacturing defects only.
• Overvoltage or wrong wiring voids the warranty.
• Shipping options: FedEx, UPS, DHL.
• Tracking number provided after shipment.

Frequently Asked Questions (FAQ)

Q1: What encoder types work with the EL5021?

The Beckhoff EL5021 works with SinCos encoders having differential 1 VPP output. It accepts A, A̅, B, B̅, C, C̅ signals. Typical encoders include Heidenhain and other SinCos types.

Q2: What is the maximum input frequency?

Maximum input frequency is 250 kHz at 10-bit resolution. The sampling rate is 70 MHz. Higher frequencies require lower resolution settings.

Q3: Does the EL5021 provide power to the encoder?

Yes, the terminal provides 5V DC encoder operating voltage. Maximum current is 0.5 A. The 5V supply generates from the 24V power contacts.

Q4: What diagnostic features does the EL5021 have?

The terminal includes amplitude error detection and frequency error detection. It also has an integrated frequency measurement function. Use these for encoder health monitoring.

Q5: Does the EL5021 support distributed clocks?

Yes, this terminal supports high-precision EtherCAT distributed clocks. This enables synchronous reading of encoder values with other inputs. Essential for coordinated motion control applications.

Buying Guide

When you buy a Beckhoff EL5021 encoder terminal, follow these tips. First, verify your encoder type. Use SinCos 1 VPP differential output only. Second, check your encoder power needs. Terminal provides 5V at 0.5A max. Third, determine your required resolution. Interpolation up to 13 bits (8192 steps/period). Fourth, consider maximum input frequency. This terminal handles 250 kHz. Fifth, evaluate diagnostic needs. Amplitude and frequency error detection included. Sixth, check distributed clock requirement. Use for synchronized motion control. Seventh, verify your Ex zone requirement. ATEX Zone 2 approved. Eighth, check your temperature range. Operating range is 0°C to +55°C. Ninth, calculate your E-bus power budget. Terminal draws 120 mA typical. Tenth, review warranty terms. We offer 12 months coverage. Eleventh, choose your shipping method. We use FedEx, UPS, and DHL. Finally, test the terminal with your encoder before full system integration.

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