ABB DO571 Digital Output Relay Module

Technical Specifications

• Product Type: Digital Output Relay Module
• Number of Output Channels: 8 relay outputs (non-latching)
• Output Contact Rating: 2 A per channel @ 24 V DC / 24 V AC or 120/240 V AC
• Isolation Groups: 2 galvanically isolated groups (4 channels per group)
• Process Supply Voltage (L+): 24 V DC (18–30 V DC range)
• Current Consumption (via L+): 50 mA (typical)
• Switching Delay (0→1 / 1→0): Max. 10 ms (typical)
• Isolation Voltage: 250 V AC (channel-to-system isolation)
• Surge Voltage Withstand: 35 V DC for 0.5 s
• Operating Temperature: -25 °C to +60 °C
• Storage Temperature: -40 °C to +85 °C
• Relative Humidity: 5% – 95% RH (non-condensing)
• Vibration Resistance: 5 g, 10 Hz – 150 Hz
• Shock Resistance: 30 g, 11 ms
• Dimensions (W x H x D): 120 mm x 100 mm x 40 mm
• Weight: Approx. 0.4 kg
• Protection Class: IP20 (panel/din rail mount)
• Mounting: Standard DIN rail mounting
• Certifications: CE, UL, ATEX (for hazardous areas), EMC compliant (EN 61000-6-2, EN 61000-6-4)
• Status Indicators: 1 yellow LED per channel (ON when output is active HIGH)
• Protection Features: Reverse voltage protection, overcurrent protection (3A fast-blow fuse recommended)

Key Features & Benefits

1. 8-Channel High-Capacity Relay Outputs
   • Equipped with 8 independent relay outputs, each capable of switching up to 2 A at a wide voltage range (24 V DC/AC to 240 V AC).
   • Supports direct control of various loads including solenoid valves, contactors, relays, indicator lights, and small motors.
   • Non-latching relay design ensures fail-safe operation on power loss.
2. Full Galvanic Isolation
   • Provides 250 V AC galvanic isolation between output channels and the PLC bus, eliminating ground loops and electrical interference.
   • Features two isolated output groups (4 channels each), enhancing system safety and protecting the main controller from field-side voltage transients and faults.
3. Robust Industrial Design
   • Constructed with industrial-grade components to operate stably in extreme temperatures, high humidity, and high-electrical-noise environments.
   • IP20 protection rating prevents dust ingress and accidental contact, suitable for installation in standard industrial control cabinets.
   • High resistance to vibration and shock, ideal for use in heavy machinery and plant floor applications.
4. Advanced Diagnostics & Status Visibility
   • Individual LED indicators for each output channel provide real-time visual status monitoring for quick troubleshooting.
   • Integrated with AC500 PLC diagnostic functions, enabling remote monitoring of module health and output status.
   • Comprehensive fault detection for short circuits and overloads, supporting fast system recovery.
5. Seamless System Integration
   • Fully compatible with ABB AC500 and AC500-eCo PLC platforms, supporting direct plug-and-play installation.
   • Adopts standard S500 I/O mechanics for easy mixing and matching with other I/O modules (digital, analog, special functions).
   • Simplified wiring via dedicated terminal blocks (TA563-11), reducing installation and commissioning time.
6. Flexible Configuration & Safety
   • Supports wide input voltage tolerance (18–30 V DC) for stable operation under fluctuating power conditions.
   • Built-in reverse polarity protection safeguards the module against incorrect wiring.
   • Output circuits are designed for safe operation in ATEX-certified hazardous area installations.

Application Scenarios

• Manufacturing Automation
  • Controls solenoid valves, pneumatic/hydraulic actuators in assembly lines, packaging machines, and material handling systems.
  • Drives contactors and relays for motor control in automotive, electronics, and general manufacturing.
  • Activates indicator lights, alarms, and safety interlocks in production cells.
• Process Industries (Oil & Gas, Chemical, Pharmaceutical)
  • Switches on/off control valves, pumps, and agitators in process skids.
  • Used in safety instrumented systems (SIS) for emergency shutdown (ESD) signal outputs.
  • Operates in ATEX-classified hazardous areas with explosive gas or dust.
• Water & Wastewater Treatment
  • Controls filter valves, pump starters, and chemical dosing systems.
  • Activates level alarms and flow control mechanisms in water distribution networks.
  • Reliable operation in damp and corrosive treatment plant environments.
• Power Generation & Distribution
  • Drives switchgear control circuits, circuit breakers, and protection relays in substations.
  • Controls auxiliary systems such as cooling fans, pumps, and lighting in power plants.
  • Ensures stable operation in high-EMI environments.
• Building Automation & HVAC
  • Controls fan motors, dampers, and pumps in heating, ventilation, and air conditioning systems.
  • Switches electrical circuits for lighting, access control, and security systems.
• Mining & Metals
  • Operates heavy-duty conveyors, crushers, and material feeders.
  • Withstands extreme temperatures, vibration, and dust in mineral processing plants.
  • Provides robust control for ore sorting and smelting equipment.