1756-OBV8S

Overview of Allen Bradley 1756-OBV8S

The Allen Bradley 1756-OBV8S is an 8-point ControlLogix safety output module engineered to deliver reliable control in safety-critical industrial automation applications. This non-isolated digital safety output module provides sourcing and bipolar type outputs, supporting voltage ranges from 10-30V DC for field devices and operating within 18-32V DC specifications. Certified for use in safety-control networks, the module meets rigorous standards up to and including SIL 3 and PLe, Category 4 as defined in IEC 61508, IEC 61511, IEC 62061, and ISO 13849-1. The 1756-OBV8S integrates into ControlLogix chassis systems, enabling precise execution of safety functions such as emergency stops and safety interlocks. With eight channels, the module offers flexibility for controlling multiple safety-rated devices simultaneously while maintaining compliance with international safety regulations. Operating temperatures range from 0 to 60 degrees Celsius, and the module draws 280 mA at 5.1V DC from the backplane with a field current capacity of 8.1 A. The compact design features plug-in TC connections and uses removable terminal blocks for straightforward installation and maintenance.

Key Features of Allen Bradley 1756-OBV8S

• Eight Safety Output Channels: Supports simultaneous control of multiple safety devices with sourcing and bipolar outputs
• SIL 3 / PLe Cat. 4 Certified: Meets international safety standards for critical control applications
• Wide Voltage Range: Operates with 18-32V DC field voltage and 10-30V DC output compatibility
• Removable Terminal Blocks: Simplifies wiring and maintenance with plug-in connections
• ControlLogix Integration: Seamless compatibility with ControlLogix platforms for scalable safety systems

Technical Specs of 1756-OBV8S

Series	ControlLogix
Output Channels	8 points
Output Type	Bipolar/Sourcing
Operating Voltage	18-32V DC
Output Voltage	10-30V DC
Backplane Current	5.1V DC, 280 mA
Field Current	8.1 A SELV/PELV
Per Channel Current	1 A max, 150 VA
Operating Temperature	0-60°C (32-140°F)
Safety Rating	SIL 3, PLe Cat. 4
Terminal Connection	Plug-in (RTB)
Dimensions	20mm W x 3mm H x 15mm D

Applications / Use Case

The Allen Bradley 1756-OBV8S serves critical roles in industrial environments where safety-rated outputs are mandatory for protecting personnel and equipment. Manufacturing facilities deploy this module to control emergency stop circuits, safety light curtains, safety gates, and interlock systems that require certified safety outputs. In automated production lines, the 1756-OBV8S manages safety relays and contactors that isolate hazardous machinery during fault conditions or maintenance operations. Process industries such as chemical plants and oil refineries utilize the module for shutdown systems and burner management applications where safety integrity is paramount. The module's SIL 3 certification makes it suitable for high-risk applications in automotive assembly, packaging machinery, and material handling systems. Machine builders integrate the 1756-OBV8S into control panels for mobile equipment, presses, and robotic cells requiring functional safety compliance. The eight independent channels allow distributed safety architectures across large machines or multiple zones within a facility. With its compatibility with ControlLogix safety controllers and GuardLogix systems, the module forms part of comprehensive safety networks that provide advanced diagnostics, monitoring, and rapid response to safety events.

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