Allen-Bradley | 1734-IB8S | POINT I/O

Product Description: Allen-Bradley 1734-IB8S

The Allen-Bradley 1734-IB8S is an 8-channel safety- rated digital input module within the POINT I/O family, designed to monitor safety devices such as emergency stop buttons, safety interlocks, and light curtains. It supports 24V DC sinking inputs and provides channel-level diagnostics, meeting rigorous safety standards for SIL 3 and PLe applications. This module is ideal for distributed safety systems requiring compact, reliable, and certified safety input solutions.

Key Features

• 8 safety-rated sinking input channels
• Designed for 24V DC nominal input signals
• Compliant with SIL 3 (IEC 61508) and PLe (EN ISO 13849-1), Category 4
• Channel-level diagnostics including cross-short, open-wire, and external fault detection
• Integrated LED indicators for status and fault reporting
• Supports dual-channel input configurations
• Works seamlessly with GuardLogix® safety controllers

Technical Specifications

• Number of Inputs: 8
• Input Type: 24V DC sinking (requires sourcing field devices)
• Input Voltage Range: 11–30V DC
• Input Current: 2.5 mA at 24V DC
• Isolation Voltage: 50V (field to system, channel to channel)
• Diagnostic Features: Cross-circuit detection, open-wire detection, short-circuit, external fault
• Safety Certifications:
  • SIL 3 (IEC 61508)
• Backplane Current Draw: 75 mA at 5V DC
• Operating Temperature: 0°C to 55°C
• Dimensions (HxWxD): approx. 75 x 12 x 55 mm
• Mounting: DIN rail with POINT I/O terminal base (e.g., 1734-TOPS, 1734-TB3S)

Application Areas

• Emergency stop monitoring
• Light curtain and safety interlock detection
• Robotics and machinery hazard zone supervision
• Distributed safety systems in industrial automation
• Functional safety for OEM equipment

Advantages

• Fully certified for high-integrity safety applications
• Detailed diagnostics reduce troubleshooting time
• Compact design allows for space-efficient installations
• Dual-channel input capability supports redundancy
• Seamless integration into GuardLogix and other Rockwell safety architectures