Allen-Bradley 1746-OX8 | SLC 500 Digital Contact Output Module
Introduction:
Allen-Bradley 1746-OX8 SLC 500 Digital Contact Output Module. 8 N.O. relay outputs at 5-265V AC or 5-125V DC. Individually isolated for high-current applications.
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Product Attributes:
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Product Overview
The Allen-Bradley 1746-OX8 is an SLC 500 digital contact output module. This module features 8 N.O. relay contact outputs that are individually isolated. It operates at 5-265V AC or 5-125V DC for flexibility. The Allen-Bradley 1746-OX8 is intended for high-current relay applications. Users trust this module for reliable switching in industrial control systems.
Technical Specifications
The 1746-OX8 delivers robust relay output performance with individual isolation. Below are the complete technical details.
General Specifications
Manufacturer: Rockwell Automation for industrial control reliability.
Brand: Allen-Bradley premium automation products.
Part Number: 1746-OX8 for precise identification.
Series: SLC 500 programmable controller family.
Module Type: Digital Contact Output Module.
Outputs: 8 N.O. relay contact outputs.
UPC: 10662073896620 for universal product identification.
Voltage and Current Ratings
Operating Voltage: 5-265V AC or 5-125V DC.
Current per Output (120V AC): 3 amps.
Current per Output (24V DC): 1.2 amps.
Minimum Load Current: 10 mA at 5V DC.
Maximum Off-State Leakage: 0 mA for complete isolation.
Relay Contact Ratings (AC)
Maximum Make/Break (120V AC): 30 A each.
Maximum Make (240V AC): 15 A.
Maximum Break (240V AC): 1.5 A.
Continuous Current (AC): 5 A for both voltages.
Make VA Rating: 3600 VA.
Break VA Rating: 360 VA.
Relay Contact Ratings (DC)
Maximum Make/Break (125V DC): 0.22 A each.
Maximum Make/Break (24V DC): 1.2 A each.
Continuous Current (125V DC): 1 A.
Continuous Current (24V DC): 2 A.
Make/Break VA Rating: 28 VA each.
Continuous VA Limit: 1440 VA maximum per module.
Backplane Current Consumption
At 5V DC: 85-90 milliamps (0.085-0.090 A).
At 24V DC: 90 milliamps (0.090 A).
Total Draw: Low consumption for 8 relay outputs.
Response Time and Step Response
Step Response (Input): 60 milliseconds.
Step Response (Output): 2.5 milliseconds.
Signal Delay (Resistive Load): 10 milliseconds for OFF and ON.
Switching Speed: Suitable for most industrial relay applications.
Isolation and Noise Immunity
Electro-Optical Isolation: 1500 Volts between I/O terminals and control logic.
NEMA Standard: ICS 2 to 230 noise immunity.
Individual Isolation: Each output is individually isolated.
Power Dissipation
Heat Dissipation per Point: 0.825 watts.
Minimum Dissipation: 2.590 Watts.
Total Dissipation: 8.60 Watts for the full module.
Environmental Specifications
Operating Temperature (Air Surrounding System): 0 to 60°C.
Storage Temperature: -40 to 85°C.
Operating Vibration (5-57 Hz): 0.015 inches peak displacement.
Operating Vibration (57-2000 Hz): 2.5 g acceleration.
Operating Shock: 10 g.
Enclosure Type: Open-type requiring installation in a cabinet.
Physical and Installation Specifications
Mounting: Chassis mount in SLC 500 rack.
Status Indicators: Available for output status monitoring.
Removal/Installation: Only when power is not applied to the chassis.
Application Suitability
Primary Application: Individually isolated, high-current relay applications.
Load Types: Resistive loads recommended.
Compatibility: SLC 500 system platform.
Installation Guide
Follow these steps to install the Allen-Bradley 1746-OX8 correctly.
Power Down the Chassis: Turn off all power to the SLC 500 rack.
Locate an Available Slot: Find an empty I/O slot in the chassis.
Align the Module: Position the 1746-OX8 with the slot guides.
Insert the Module: Slide it into the slot until firmly seated.
Secure the Module: Tighten the mounting screws on the top and bottom.
Wire Output Loads: Connect field devices to the N.O. relay terminals.
Check Voltage Rating: Ensure AC loads are 5-265V or DC loads 5-125V.
Verify Current Limits: Do not exceed 3A at 120V AC or 1.2A at 24V DC.
Apply Power: Turn on the chassis power to the system.
Monitor Status LEDs: Check output indicators for proper operation.
Test Output Switching: Verify ON/OFF function with field devices.
Measure Dissipation: Ensure total module dissipation stays below 8.60 Watts.
Installation Notes
Install or remove the module only when chassis power is off.
Individual output isolation allows mixing AC and DC loads on the same module.
Continuous current per module should be limited to 1440 VA.
The open-type enclosure requires installation in a protected cabinet.
Outputs are N.O. (normally open) relay contacts only.
Packaging List
This unit ships as a new and original product.
Allen-Bradley 1746-OX8 SLC 500 Digital Contact Output Module
Product data sheet with wiring diagram
Installation instructions
Anti-static factory packaging box
Frequently Asked Questions (FAQ)
1. Can I mix AC and DC loads on the same 1746-OX8 module?
Yes, the Allen-Bradley 1746-OX8 has individually isolated outputs. Each of the 8 N.O. relay contacts can switch different voltage types independently.
2. What is the maximum current rating per output on this module?
The 1746-OX8 provides 3 amps per output at 120V AC. At 24V DC, the maximum is 1.2 amps per output.
3. What is the backplane current consumption for this module?
The Allen-Bradley 1746-OX8 consumes 85-90 milliamps at 5V DC. It also draws 90 milliamps at 24V DC from the backplane.
4. What is the operating temperature range for the 1746-OX8?
The 1746-OX8 operates with an ambient air temperature of 0 to 60°C. Storage temperature ranges from -40 to 85°C.
5. Does this module have status indicators for each output?
Yes, the Allen-Bradley 1746-OX8 includes status indicators. These LEDs show the ON/OFF state of each relay output channel.