Allen-Bradley 1746-OB32E SLC 500 Digital DC Output Module

Product Overview

The Allen-Bradley 1746-OB32E is a SLC 500 Digital DC Output Module from Rockwell Automation. This module features thirty-two (32) 24VDC, electronically protected output channels. It is designed for high-current applications and can be installed in SLC 500 fixed or modular hardware. The electronic protection safeguards against overload and short-circuit conditions, automatically limiting current when faults are detected.

Technical Specifications Breakdown

Key parameters for the 1746-OB32E are listed below for quick reference:

Industry Applications

This digital output module is well-suited for high-current DC loads in manufacturing lines, packaging machinery, and material handling systems. The electronic protection minimizes downtime by automatically resetting after an overload clears. In applications where continuous operation is critical, the 1746-OB32E provides reliable switching for solenoids, relays, and indicator lights.

Installation and Setup Guidance

Install the module in any SLC 500 chassis slot. Route input power separately from I/O device cables. Use color-coded removable terminal blocks with self-lifting plates that accept up to 14 AWG (2 mm²) wire. Ensure the operating temperature stays within the specified range. The module provides LED indicators for each output point to verify status.

Maintenance and Reliability

Periodically inspect the module for dust or debris on the terminal blocks. Verify that the backplane current consumption (190 mA at 5V) is within the chassis power budget. The electronic protection helps prevent damage from short circuits, but external fusing may still be recommended for added safety.

Compatibility and Integration

The 1746-OB32E integrates with SLC 500 processors and other 1746-series I/O modules. It functions similarly to the 1746-OB32 but adds integral electronic protection. Each group of sixteen points shares a common connection, simplifying wiring for grouped loads.

Selection Guide and Purchasing Advice

When selecting a digital output module, consider the voltage range and current requirements of your loads. The 1746-OB32E offers 32 outputs with electronic protection, making it a robust choice for high-density DC applications. Contact AutoDCSTech for availability and lifecycle status before ordering.

Troubleshooting and Common Issues

If an output does not energize, check the LED indicator on the front panel. If the LED is off, verify the processor logic and wiring. The module automatically resets after an overload clears, so unexpected load activation may occur after fault recovery. Plan your safety logic accordingly.