Description

The Allen-Bradley 1746-OBP8 is a specialized high-current DC output module designed for the SLC 500 programmable controller platform. This module provides eight (8) sourcing outputs, organized into two isolated groups of four, making it suitable for demanding industrial applications that require driving high-wattage loads such as heavy-duty solenoids, actuators, and large indicators. The module is specifically engineered to handle higher current demands than standard digital output cards without requiring thermal derating.

Features

• High-Current Capacity: Delivers 2.0 Amps continuous current per point across the full operating temperature range (0 to 60 degC).
• Isolated Output Groups: Eight outputs configured in two isolated groups for flexible wiring and circuit protection.
• Diagnostic Indicators: Integrated e-fuse LED indicators provide real-time status monitoring and rapid fault identification.
• High-Power Performance: Designed for 20.4–26.4V DC sourcing applications with minimal on-state voltage drop.

Applications

The 1746-OBP8 is ideal for control systems where standard I/O modules lack the current capacity to drive inductive or high-draw resistive loads. Common applications include direct control of hydraulic valves, pneumatic solenoids, and high-intensity signal beacons within SLC 500-based automation architectures.

Technical Specifications

Installation Guidelines

• Power Down: Always remove power from the SLC 500 chassis before inserting or removing the module to prevent electrical arcing or damage to the backplane.
• ESD Protection: Handle the module by the edges and avoid touching the backplane connector pins to prevent electrostatic discharge damage.
• Wiring: Ensure that external power supplies are within the 20.4–26.4V DC range. Use appropriate wire gauges for the 2.0A per point load to prevent overheating.
• Grounding: Maintain proper chassis grounding to minimize EMI interference, especially when driving inductive loads.
• Ventilation: Ensure adequate airflow around the SLC 500 rack to maintain the specified operating temperature range of 0 to 60 degC.

FAQ

Does this module require external power? Yes, the 1746-OBP8 requires an external 24V DC power source to drive the output loads.

Can I use this module for sinking applications? No, the 1746-OBP8 is a sourcing output module only.

What does the 'P' in the part number signify? The 'P' designates the module's high-power capability, distinguishing it from standard-duty DC output modules in the SLC 500 series.