Allen-Bradley | 1734-OB8S | POINT I/O

Product Description: Allen-Bradley 1734-OB8S

The Allen-Bradley 1734-OB8S is an 8-channel safety- rated digital output module from the POINT I/O family, specifically designed for safety-critical control applications. It provides sourcing outputs and is TÜV-certified for use in SIL 3 and PLe safety systems. The module is suitable for applications where reliable actuation of devices such as contactors, relays, and solenoids is essential in emergency or hazardous situations.

Key Features

• 8-channel safety-rated sourcing digital outputs
• Certified for use in SIL 3 (IEC 61508) and PLe (EN ISO 13849-1) systems
• Short-circuit and open-load detection
• Independent channel switching with integrated diagnostics
• Supports standard POINT I/O mounting and wiring bases
• Compatible with GuardLogix® and other safety PLC systems
• LED indicators for per-channel status and diagnostics

Technical Specifications

• Number of Outputs: 8
• Output Type: Solid-state, sourcing (PNP)
• Output Voltage: 24V DC nominal (range 10–28.8V DC)
• Output Current: 0.5 A per channel, 4.0 A maximum per module
• Isolation: 50V (field to system), 50V (channel to channel)
• Diagnostic Features: Short-circuit, open load, cross- circuit, power loss
• Safety Ratings:
  • SIL 3 (IEC 61508)
• Operating Temperature: 0°C to 55°C
• Backplane Current Draw: 75 mA at 5V DC
• Dimensions (HxWxD): approx. 75 x 12 x 55 mm
• Mounting: DIN rail with 1734-TOPS, 1734-TB, or 1734-TB3S base

Application Areas

• Emergency stop control and shutdown systems
• Guarded access and interlock systems
• Functional safety in manufacturing lines
• Safety-rated actuator control (e.g., relays, contactors)
• Robotics and high-risk automated machinery

Advantages

• Fully certified for use in high-integrity safety systems
• Individual diagnostics ensure fast fault detection and response
• Modular design enables flexible system expansion
• Enhances operational safety without sacrificing I/O density
• Seamless integration into GuardLogix and other safety PLC architectures