Product Introduction
The Allen-Bradley 1746-OB8 is a Digital DC Output Module from the SLC 500 series, designed for high-current industrial applications. With 8 discrete outputs and a voltage range of 10-50VDC source, this module delivers robust performance in demanding environments. Its compact form factor and proven reliability make it a cost-effective choice for controlling solenoids, relays, and indicator lights. The 1746-OB8 dissipates only 6.9W total heat, contributing to energy efficiency and longer system life.
Technical Specifications Breakdown
Understanding key parameters helps you select the right module for your system. Below are the critical specs for the Allen-Bradley 1746-OB8:
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Outputs: 8 channels, each rated at 1A (or 0.5A at 60°C), with a total module current of 8A (or 4A at elevated temperature).
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Backplane Current (5V): 135mA, ensuring low power draw from the chassis.
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Voltage Range: 10-50VDC source, accommodating various DC supply levels.
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Step Response: 60ms in, 2.5ms out, providing fast and predictable switching.
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Surge Current: Up to 3A for 10ms per point, handling momentary loads without failure.
These specs reflect the module's suitability for high-current outputs while maintaining thermal stability. The 1746-OB8's off‑state leakage is a mere 1mA, minimizing wasted power and enhancing reliability.
Industry Applications
The Allen-Bradley 1746-OB8 excels in automated manufacturing lines, conveyor systems, and packaging machinery. For example, in a bottling plant, its eight outputs can directly drive valves and actuators, withstanding the inrush currents of solenoid coils. The module's 60°C operating limit allows placement near hot equipment without derating. By using this module, facilities reduce downtime and replacement costs — a direct return on investment.
Compatibility & Integration
As part of the SLC 500 family, the 1746-OB8 integrates seamlessly with Allen‑Bradley SLC 500 processors (e.g., 1747‑Lxxx) and 1746 I/O chassis. It communicates over the backplane and requires no additional configuration software for basic operation. The module is UL‑listed, CE compliant, and CSA/C‑Tick certified, easing global system approvals. Use standard 1746 wiring connectors for quick installation.
Selection Guide & Purchasing Advice
Before purchasing the Allen-Bradley 1746-OB8, verify your system's backplane current capacity (135mA per module) and ensure your power supply provides 24VDC nominal (10-50VDC acceptable). This module is ideal for upgrading older 1746‑OB modules or expanding discrete output points. For genuine spare parts and competitive pricing, visit UBEST Automation (ubest101) — your trusted source for industrial automation spares.