IFM RM8004 Hollow Shaft Absolute Encoder – RMS0024-C24/USU

The IFM RM8004 is a robust multiturn absolute encoder with a 12 mm hollow shaft and high-resolution 24-bit positioning for precise tracking of rotary motion in industrial automation systems. Equipped with a CANopen interface, the RM8004 offers full configurability for node ID, scaling, preset values, and direction of rotation. With a shock-resistant design, IP65 housing, and support for up to 4096 revolutions and 4096 steps per turn, this encoder is ideal for demanding applications in packaging, material handling, robotics, and motion control.

Technical Specifications

Model: RM8004
Manufacturer: IFM
Encoder Type: Absolute – Multiturn
Shaft Design: Hollow shaft open to one side
Shaft Diameter: 12 mm
Resolution: 4096 steps × 4096 revolutions (24-bit total)
Output Code: Binary

Application

• Target Use: Precise speed, angle, position, and length measurement
• Installation Areas: OEM equipment, conveyors, motor feedback, robotics
• Fixing Flange: Ø 36.5 mm

Electrical Characteristics

• Operating Voltage: 9–30 V DC (supply class 2 per cULus)
• Current Consumption:
  • < 100 mA @ 10 V DC
  • ≤ 50 mA @ 24 V DC
• Protection Class: III
• Reverse Polarity Protection: Yes
• Short-Circuit Protection: Yes
• Electrical Connection: 1 × M12 A-coded (axial)

Communication Interface

• Protocol: CAN (CANopen)
• Default Factory Settings:
  • Baud Rate: 125 kBit/s
  • Node ID: 32
  • Profiles: DSP-406 V3.1, DS 301 V4.02, DS 306 V2.0

Software & Programming

• Parameter Options:
  • Node ID configuration
  • Preset value
  • Baud rate adjustment
  • Direction of rotation
  • Scaling and diagnostics

Measuring Performance

• Resolution: 4096 steps/rev × 4096 revolutions
• Angular Accuracy: ±0.25°
• Max Mechanical Speed: 6000 RPM

Environmental Conditions

• Ambient Temperature: –40 to +85 °C
• Storage Temperature: –40 to +85 °C
• Humidity: Up to 98% RH
• Ingress Protection:
  • Housing: IP65
  • Shaft: IP64

Compliance & Certifications

• EMC Standards: EN 61000 series
• Shock Resistance: < 300 g (6 ms) – DIN EN 60068-2-27
• Vibration Resistance: 30 g (10–1000 Hz) – DIN EN 60068-2-6
• MTTF: 240 years

Mechanical Design

• Weight: 235.5 g
• Dimensions: Ø 36.5 mm × 74 mm length
• Materials:
  • Flange: Aluminium
  • Housing Cap: Steel (powder-coated)
  • Shaft: Hardened Steel
• Max Shaft Load:
  • Axial: 40 N
  • Radial: 110 N
• Starting Torque: 3 Nm (at 25 °C)

LED Indicators

• Green (solid): Pre-operational mode
• Green (flashing): Operational mode
• Red (flashing): Error condition

Key Features & Benefits

✅ High Resolution 24-bit Encoder: 4096 steps and revolutions for detailed feedback.

✅ CANopen Protocol Support: Fully configurable for industrial networking.

✅ Rugged Hollow Shaft Design: Easy integration onto shafts without additional couplings.

✅ Wide Temperature & Vibration Tolerance: Built for harsh automation environments.

✅ Long-Life Design: 240-year MTTF and heavy-duty shaft load capacity.

✅ Easy Setup & Diagnostics: LED feedback and software parameterisation via CAN.

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