Product Overview

The Allen-Bradley 1746-OA8 is a discrete AC output module for the SLC 500 system. This module provides eight AC output channels in two groups of four. It delivers nominal output voltages of 120/240V AC. The Allen-Bradley 1746-OA8 operates with an output voltage range of 85 to 264V AC at 47-63 Hz. Users trust this general-purpose module for reliable AC load control applications.

Technical Specifications

The 1746-OA8 delivers reliable AC output switching with robust current capacity. Below are the complete technical details.

General Specifications

• Manufacturer: Rockwell Automation for industrial control reliability.

• Brand: Allen-Bradley for SLC 500 compatibility.

• Part Number: 1746-OA8 for precise identification.

• Series: SLC 500 programmable controller family.

• Module Type: Discrete AC output module.

• UPC: 10662073521331 for universal product identification.

• Applications: General Purpose AC load control.

Output Channel Specifications

• Number of Groups: Two (2) groups.

• Number of Channels per Group: Four (4) channels per group.

• Total Number of Outputs: Eight (8) outputs.

• Nominal Output Voltage: 120 / 240 VAC.

• Output Voltage Range: 85 to 264 VAC.

• Frequency Range: 47 to 63 Hz.

• ON Signal Delay (resistive load): 1 ms maximum.

• OFF Signal Delay (resistive load): 11 ms maximum.

• On-State Voltage Drop (max): 1.5V at 1.0 A.

• Surge Current per Point: 10 A for 25 ms.

Current Ratings by Temperature

• Continuous Current per Point @ 30°C: 1.00 A.

• Continuous Current per Point @ 60°C: 0.50 A.

• Continuous Current per Module @ 30°C: 8.0 A.

• Continuous Current per Module @ 60°C: 4.0 A.

Backplane Power Specifications

• Backplane Current Consumption: 185 mA @ 5 VDC.

• Backplane Current (5 Volts): 185 milliamps.

• Slot Occupancy: Single slot of SLC 500 chassis.

Performance Specifications

• Step Response: 60 ms in, 2.5 ms out.

• Response Speed: Suitable for most AC load switching applications.

Installation Guide

Follow these steps to install the Allen-Bradley 1746-OA8 correctly.

1. Power Down the Chassis: Turn off all power to the SLC 500 rack.

2. Verify Power Supply Capacity: Ensure backplane can supply 185 mA at 5 VDC.

3. Locate an Available Slot: Find any empty I/O slot in the chassis.

4. Insert the Module: Slide the 1746-OA8 into the slot carefully.

5. Secure the Module: Lock using the retaining clips at top and bottom.

6. Wire the Terminal Block: Connect AC loads to the eight output terminals.

7. Group Wiring Note: Outputs are arranged in two groups of four channels.

8. Connect AC Supply: Wire 85-264 VAC, 47-63 Hz to each group's common.

9. Verify Load Current per Point: Do not exceed 1.0 A per point at 30°C or 0.5 A at 60°C.

10. Check Total Module Current: Keep under 8.0 A at 30°C or 4.0 A at 60°C.

11. Apply Power: Turn on the backplane power to the chassis.

12. Check Output Status: Verify module operation with LED indicators.

13. Test Outputs: Energize outputs and measure delays (1 ms ON, 11 ms OFF).

14. Monitor Voltage Drop: Ensure on-state drop stays below 1.5V at 1.0 A.

Installation Notes

• The module provides 8 AC outputs in two isolated groups of four.

• ON signal delay is 1 ms maximum for resistive loads.

• OFF signal delay is 11 ms maximum for resistive loads.

• Surge current per point reaches 10 A for 25 ms.

• Suitable for general purpose AC load control applications.

Packaging List

This unit ships as a new and original product.

• Allen-Bradley 1746-OA8 Discrete AC Output Module

• Removable terminal block (pre-installed)

• Product data sheet with wiring diagram

• Anti-static factory packaging bag

Frequently Asked Questions (FAQ)

1. How many outputs does the 1746-OA8 provide?
The Allen-Bradley 1746-OA8 provides eight AC outputs arranged in two groups of four channels each. Each group shares common connections.

2. What is the output voltage range of the 1746-OA8?
The 1746-OA8 operates with an output voltage range of 85 to 264 VAC at 47-63 Hz. Nominal voltages are 120/240 VAC.

3. What is the current rating per output on the 1746-OA8?
Each output on the Allen-Bradley 1746-OA8 handles 1.0 A at 30°C and 0.5 A at 60°C. The total module current is 8.0 A at 30°C or 4.0 A at 60°C.

4. What are the output delay times for this module?
The 1746-OA8 has an ON signal delay of 1 ms maximum and an OFF signal delay of 11 ms maximum with resistive loads.

5. What is the backplane current draw of the 1746-OA8?
The Allen-Bradley 1746-OA8 draws 185 mA at 5 VDC from the backplane. It occupies a single slot in the SLC 500 chassis.