1734-OB8S

Reliable safety output module 1734‑OB8S for distributed safety systems

The Allen‑Bradley 1734‑OB8S is a safety-rated POINT I/O module designed for distributed safety architectures. It provides 8 solid-state sourcing outputs at 24 V DC, each supporting 1 A, with a total module output capacity of 8 A. It is certified to SIL 3 / PLe standards and supports dual‑channel mode for redundancy in safety systems.

Technical specifications

• Manufacturer: Allen‑Bradley / Rockwell Automation

• Module type: Safety Output Module (POINT I/O)

• Number of outputs: 8 sourcing (PNP) solid-state

• Output current: 1 A per channel (max)

• Total module output: 8 A

• Supply voltage: 24 V DC nominal (range 19.2–28.8 V DC)

• Reaction time: ≤ 6.2 ms

• Diagnostics: short-circuit, cross-circuit, overload detection per channel

• Maximum field capacitance per output: 950 nF

• Voltage drop: up to ~0.165 V

• Leakage current: ≤ 0.1 mA

• Bus current (point bus): up to 190 mA

• Power dissipation: max ~4.5 W, typical ~3.02 W

• Insulation: 50 V continuous basic insulation between field side and system; tested 707 V DC for 60 s

• Operating temperature: –20 °C to +55 °C

• Dimensions: approx. 77 mm × 25 mm × 55 mm

• Weight: ~0.11 kg

• Mounting: DIN rail via POINT I/O terminal base

• Safety standards: certified to SIL 3, PLe, supports dual-channel operation

Key advantages

• High-reliability safety outputs for demanding applications

• Certified for SIL 3 / PLe use in safety systems

• Dual-channel mode supports redundant safety logic

• Per-channel diagnostics (short, cross-circuit, overload)

• Compact size fits distributed I/O architecture

• Seamless integration into GuardLogix / POINT Guard networks

Application and use cases of 1734‑OB8S

This module is frequently used in safety circuits within machine control, guarding, emergency stop circuits, actuator disable circuits, and distributed safety control systems. It is ideal where reliable, certified safety outputs are required across a plant floor in modular architectures.

About the manufacturer

Allen‑Bradley (Rockwell Automation) is a well-known leader in industrial automation and safety systems. The POINT I/O series, including safety modules like the 1734‑OB8S, provides scalable, flexible, and certified safety I/O solutions for modern control systems.