1. Basic Information

2. Technical Specifications

2.1 Basic Parameters

• Model: NBIO-31
• Part No.: 3BSE011337R1
• Device Type: High-density Digital IO Expansion Module
• Applicable System: ABB AC800M / Freelance / 800xA DCS System
• Channel Configuration: 16DI + 16DO (Relay Output)
• Dimension: 100×100×30mm
• Weight: 0.3kg
• Protection Class: IP20
• Power Consumption: ≤5W (No load)

2.2 Power Supply Parameters

• Rated Voltage: 24V DC
• Working Voltage Range: 18V～30V DC
• DI Input Current: ≤5mA per channel
• Protection: Overvoltage, undervoltage, overcurrent, reverse connection & surge protection
• Isolation: Reinforced electrical isolation between channels and bus

2.3 IO Channel Performance

• Digital Input: 16CH, NPN/PNP switchable, 24V DC signal adaptation
• DI Response Time: ≤1ms
• Digital Output: 16CH Relay contact output
• Contact Capacity: AC250V/5A, DC30V/5A
• DO Response Time: ≤5ms
• Indicator: Independent LED status indicator per channel

2.4 Communication Parameters

• Bus Protocol: ABB backplane bus, Profinet, Modbus compatible
• Ethernet Rate: Up to 100Mbps
• Function: Real-time IO status upload, remote command reception, fault self-report
• Feature: Hot-swap recognition & real-time bus self-check

2.5 Environmental Parameters

• Operating Temperature: -20℃～+70℃
• Storage Temperature: -40℃～+85℃
• Humidity: 5%～95%RH (Non-condensing)
• Cooling Mode: Fanless natural heat dissipation

3. Main Features

• High-density Integrated IO Design: Integrates 32 switchable signal points in one module, saving cabinet space and reducing hardware costs for large-scale discrete signal control.
• NPN/PNP Universal Input: Dual-mode adaptive input simplifies on-site wiring, compatible with most industrial sensors and switch equipment with strong versatility.
• High-power Relay Output: Large-capacity relay contacts directly drive solenoid valves, contactors and indicators without intermediate relay conversion, simplifying control architecture.
• Millisecond-level Fast Response: Ultra-fast input and output response ensures accurate timing and interlock logic execution, avoiding control delay errors.
• Independent Channel Fault Tolerance: Single-channel failure does not affect the overall module operation, greatly improving system stability and fault resistance.
• Visual Channel Diagnosis: Independent LED indicators realize real-time working condition display and rapid fault location, improving maintenance efficiency.
• Harsh Industrial Environment Adaptability: Fanless maintenance-free design adapts to 7×24h uninterrupted operation with vibration resistance and strong EMC anti-interference capability.
• Plug-and-play System Compatibility: Perfectly matches ABB DCS systems for direct replacement of aging and faulty modules without program modification or wiring adjustment.

4. Working Principle

1. Power-on Self-check & Initialization: Complete hardware self-inspection, channel calibration and bus communication initialization after power-on, and enter IO monitoring standby state.
2. Multi-channel Switching Signal Acquisition: Collect on-site equipment status and interlock signals through 16 DI channels, with filtering, noise reduction and isolation processing before uploading to the main controller.
3. Main Control Command Parsing: Receive and verify remote control commands to filter invalid signals and ensure logical execution accuracy.
4. Relay Output Execution: Drive corresponding relay contacts to switch on/off to control on-site actuators and complete process logic control.
5. Real-time Data Interaction: Upload full-channel IO status and module operating data to the upper monitoring system for visual management.
6. Real-time Fault Protection: Monitor power supply, channel load and bus status in real time, trigger alarm and protection to prevent fault expansion.

5. Applications

5.1 ABB AC800M DCS System Expansion

5.2 Power Plant Auxiliary Control System

5.3 Chemical Process Automation

5.4 Light Industry & Municipal Automation

5.5 Old DCS System Maintenance & Upgrade