Product Summary
The 1746-OB8 from Allen-Bradley is a high-current digital DC output module for the SLC 500 system. This module delivers eight reliable sourcing outputs for demanding industrial control tasks. Its robust design ensures consistent actuation of valves, relays, and indicators.
Theme A: Product Procurement & Buyer Guide
Technical Alignment for Your Application
The 1746-OB8 module operates on a 24V DC voltage category. It supports a wide voltage range from 10 to 50 Volts DC. This flexibility allows it to integrate with many existing field devices. Engineers can use it to control up to eight separate loads.
High-Current Output Capabilities
This module delivers substantial current for demanding loads. Each output point can handle 1.0 amp at 30°C or 0.5 amps at 60°C. The entire module supports a maximum of 8 amps at 30°C or 4 amps at 60°C. This de-rating curve ensures safe operation across varying thermal conditions.
Critical Backplane and Power Specifications
The module draws only 135 milliamps from the 5V DC backplane. This low consumption minimizes the load on your SLC 500 power supply. It dissipates a total of 6.9 Watts of heat during full operation. This thermal data helps you plan proper cabinet ventilation and cooling.
Understanding Key Electrical Parameters
You must consider the minimum load current of 1 mA per point. The maximum off-state leakage is 1 mA, which prevents false triggering. The on-state voltage drop is just 1.2V at 1 amp. This low drop ensures efficient power delivery to your loads.
Step Response and Switching Speed
The 1746-OB8 offers a step response of 60 milliseconds in. Its output turns off in just 2.5 milliseconds. These speeds are suitable for most discrete manufacturing processes. They provide reliable control for high-cycle applications.
Installation and Wiring Precautions
Watch for transient pulses when applying external DC supply voltage. These pulses can occur on the output common terminals. Always refer to the official user manual for mitigation steps. Proper wiring ensures long-term system reliability.
Theme D: Expert Technical Evaluation & Performance Review
Environmental and Operational Tolerances
The 1746-OB8 operates reliably in temperatures from 0°C to 60°C. It functions in non-condensing humidity levels between 5% and 95%. This range covers most standard industrial environments. The module stores safely in temperatures from -40°C to 85°C.
Robust Isolation and Certification Compliance
The module features 1500V of electro-optical isolation. This isolation protects the control logic from field-side surges. It holds UL listing, CE compliance, and CSA certification. These marks confirm its adherence to international safety standards.
Surge Current and Protection Analysis
Each output point handles a maximum surge current of 3 amps for 10ms. This surge capability allows it to drive highly inductive loads like solenoids. The module’s design protects against brief inrush current events. This feature reduces the risk of premature output failure.
Configuration and Integration Simplicity
You can configure this module easily through your computer. The SLC 500 platform provides straightforward setup for all I/O modules. This simplicity reduces engineering time and commissioning costs. It allows for quick deployment in new or retrofit systems.
Logistics & Standard Packaging Details
- One (1) Allen-Bradley 1746-OB8 SLC 500 Output Module
- One (1) Product documentation and quick reference guide
- Standard anti-static packaging for safe transport
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