Introduction
BEI Sensors DHM5 Series IO-Link Encoders, built from a solid and reliable mechanical and electrical platform, this product series was built from the ground up for reliability and robustness. Electrical protection is built in to reduce “first installation” errors. Mechanically, the high-precision sealed bearings mean long life, even in harsh conditions. The product is tested and rated to perform from –40°C to +85°C for operation in extreme environments. This is the best all-around encoder in a 58mm package for heavy-duty industrial use.
Features
DHM5 Series IO-Link Incremental Encoders:
• Incremental encoder with IO-link programmable parameters
• IO-Link COM3 with minimal cycle time of 1ms
• Absolute position available via IO-link
• Easy programming with standard IO-Link tool
• Simple device replacement with Data Storage capability
• Universal Electronic Circuits from 4.75 to 30 Vdc
• Robust and excellent resistance to shock and vibration
• High protection level IP65, IP67 option with a sealing flange
• Operating temperature range from -40°C to 85°C
• Standard M12 connector available
Applications
• Factory automation
• Motor feedback
• Conveyors
• Automated warehousing
• General industrial system monitoring and feedback
Mechanical Specifications
| Parameter | DHM5 | DHK5 | DHO5 |
| Material – Cover | Zinc Alloy | ||
| Material – Body | Aluminium | ||
| Material – Shaft | Stainless Steel | ||
| Bearings | 6000 Series | 6803 Series | |
| Max Load – Axial | 50 N | 20 N | |
| Max Load – Radial | 100 N | 50 N | |
| Shaft Inertia | 2.5×10⁻⁶ kg·m² (10mm) | 2.9×10⁻⁶ kg·m² (14mm) | 3.2×10⁻⁶ kg·m² (14mm) |
| Torque | 4×10⁻³ N·m | 16×10⁻³ N·m | 20×10⁻³ N·m |
| Permissible Max. Speed | 12 000 min⁻¹ | 6 000 min⁻¹ | |
| Continuous Max. Speed | 10 000 min⁻¹ | 6 000 min⁻¹ | |
| Encoder Weight (Approx.) | 0.300 kg | ||
| Theoretical Mechanical Lifetime 10⁹ turns (Faxial / Fradial) | 30 N / 60 N: 26 | 20 N / 40 N: >36 | |
Electrical Specifications
This encoder series offers an incremental encoder augmented by IO-Link configurability and diagnostics capabilities. There are two different
implementations:
• Incremental encoder and IO-link on a dedicated wire (RGZ electronics)
• Incremental encoder with IO-link multiplexed on Z wire, in this case when working in a mode, the other one is disabled (RGY electronics)
| Ver. | Mode | Output Signals | Operating Voltage | Supply Current (no loads) | Current per Channel Pair | Short Circuit Proof | Reverse Polarity Tolerant | Frequency Capability | Resolution / Temp. |
| RGY (note 1) | Incremental | Programmable (HTL or TTL) | 4.75V to 30V | <75mA | <40mA | Yes | Yes | Up to 1MHz | 1–10 kppr programmable; –40°C to +85°C |
| IO-Link | IO-Link | 18V to 30V | <75mA | <40mA | Yes | Yes | IO-Link COM3 (230.4 kbits/s) | 1–16 bits programmable; –40°C to +85°C | |
| RGZ (note 2) | Incremental | Programmable (HTL or TTL) | 4.75V to 30V | <75mA | <40mA | Yes | Yes | Up to 1MHz | 1–10 kppr programmable; –40°C to +85°C |
| IO-Link | IO-Link | 18V to 30V | <75mA | <40mA | Yes | Yes | IO-Link COM3 (230.4 kbits/s) | 1–16 bits programmable; –40°C to +85°C |
(1) RGY outputs are multiplexed; they are in incremental mode or IO-link mode (default startup mode is incremental)
(2) RGZ has Incremental and IO-link outputs working simultaneously.
IO-Link Features
Process data
• Position: single turn 16 bits max
• Speed: calculated speed in rpm (signed)
Programmable Parameters
• Direction: clockwise or counter-clockwise, changes the counting direction and speed sign.
• Set Zero Pulse command: Set the current position as the incremental zero pulse position. Set also the absolute position to zero.
For incremental mode :
• Incremental resolution: number of cycles per turn: from 1 to 10000
• Output voltage level: HTL or TTL
• Zero pulse width : 90°, 180° 270° or 360° (See figure for details)
Absolute parameters (in IO-Link mode) :
• Resolution per turn: 1 to 16 bits
• Speed window calculation: time between each speed data update.
Diagnostics
• Operating Hours: number of hours since factory reset
• Temperature: event triggers when temperature exceeds specifications
• Device Status: Access to the status of the encoder
Environmental Specifications
| Parameter | Value |
| Shocks (EN 60068-2-27) | ≤ 500 m·s⁻² (during 6 ms) |
| Vibrations (EN 60068-2-6) | ≤ 200 m·s⁻² (10…2000 Hz) |
| EMC | EN 61000-6-2, EN 61000-6-4 |
| Isolation | 1 000V eff |
| Operating Temperature | –40°C to +85°C (encoder surface temperature) |
| Storage Temperature | –40°C to +85°C |
| Protection (EN 60529) | IP 65 |
| Humidity | 98% RH non-condensing at 20°C |
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