Product Overview
For maintenance engineers managing MicroLogix systems, the Allen-Bradley 1762-OB32T provides a reliable high-density solid-state output solution. This module features thirty-two (32) channels arranged in two (2) isolated output groups of sixteen (16) channels each, supporting source wiring for DC loads. Its nominal output voltage of 24VDC and operating range of 10.2-26.4 VDC make it suitable for energizing indicating lights, sounding devices, solenoid actuators, and small DC motors. The module's solid-state design reduces mechanical wear, enhancing long-term dependability in continuous operation.
Technical Specifications Breakdown
Key parameters for the 1762-OB32T are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation |
| Part Number | 1762-OB32T |
| Series | MicroLogix |
| Module Type | Solid State output module |
| Number of Outputs | Thirty-Two (32) |
| Output Groups | Two (2) isolated groups |
| Channels per Group | Sixteen (16) |
| Nominal Output Voltage | 24VDC |
| Output Voltage Range | 10.2-26.4 VDC |
| Output Current per Channel | 0.5 A @ 60 °C (140 °F) |
| Output Current per Group | 2.0 A @ 60 °C (140 °F) |
| Output Current per Module | 4.0 A @ 60 °C (140 °F) |
| Surge Current | 2.0 A (repeatable every 2 s @ 60 °C for 10 ms) |
| Minimum On-state Current | 1 mA |
| Heat Dissipation | 3.4 Watts |
| Wire Size | 22, 24, and 26 AWG |
Industry Applications
This module is ideal for discrete output control in manufacturing lines, packaging machinery, and material handling systems. The two isolated groups allow separate power feeds for different load types, reducing cross-talk and simplifying troubleshooting. Maintenance engineers appreciate the 0.5 A per channel rating at 60 °C, which supports reliable operation in warm enclosures without derating concerns.
Installation & Setup Guidance
Mount the 1762-OB32T in a suitable enclosure with a flame spread rating of 5VA, V2, V1, V0 (or equivalent) if non-metallic, to minimize fire risk. Use 22, 24, or 26 AWG wire for field connections. Ensure the enclosure interior is accessible only by a tool to prevent accidental contact. The module is designed for Pollution Degree 2 environments at altitudes up to 6562 feet without derating. Verify that the DC supply is within the 10.2-26.4 VDC range before powering up.
Maintenance & Reliability
Periodically inspect the module for signs of overheating or loose connections. Keep the enclosure clean and free of conductive dust. The solid-state outputs have no moving parts, reducing mechanical failure risk. Monitor the heat dissipation of 3.4 Watts to ensure adequate ventilation. For maximum reliability, operate within the specified current limits per channel, group, and module.
Compatibility & Integration
The 1762-OB32T is part of the MicroLogix series from Allen-Bradley (Rockwell Automation). It integrates directly with MicroLogix controllers using the backplane. The module supports source wiring, making it compatible with sourcing DC loads. No special adapters are required for standard installations.
Selection Guide & Purchasing Advice
When selecting a replacement or new module, verify that the 1762-OB32T meets your output count and voltage requirements. This unit provides 32 outputs in two isolated groups, ideal for high-density applications. For current lifecycle status and availability, contact SpareTechPLC before ordering. Our team can help confirm compatibility with your existing MicroLogix system.
Troubleshooting & Common Issues
If outputs fail to energize, first check the DC supply voltage is within 10.2-26.4 VDC. Verify that the load current exceeds the minimum on-state current of 1 mA. For intermittent operation, inspect wiring for loose connections using 22-26 AWG wire. If a group is non-functional, test the group fuse or power feed separately. The module's isolation rating of 1200V AC for 2 s helps protect against voltage spikes.
