Allen-Bradley 1746-OX8 SLC 500 Output Module

Overview

The Allen-Bradley 1746-OX8 Series A is a SLC 500 digital contact output module designed for industrial automation systems requiring high-current relay switching. This module features 8 normally open (N.O.) isolated relay contacts that can independently control both AC and DC loads across a wide voltage range. Built for rugged switching applications in manufacturing, packaging, material handling, and process control environments, the 1746-OX8 delivers reliable electrical isolation and noise immunity for legacy SLC 500 platforms.

Key Features

8 Individually Isolated Relay Outputs: Each relay contact is electrically isolated for mixed-voltage load switching and superior noise rejection.
Wide Operating Voltage Range: Supports 5–265 VAC (50/60 Hz) or 5–125 VDC, enabling flexible compatibility with diverse field devices.
High-Current Rated Contacts: Maximum 30 A make/break at 120V AC; continuous 2.5 A at 120/240V AC; 1.2 A at 24V DC.
1500V Optical Isolation: Ensures robust separation between field wiring and control logic, minimizing cross-talk and EMI interference.
Status Indicators: Built-in LED indicators provide real-time relay on/off feedback for troubleshooting.
Industrial Certifications: UL, CSA, and CE certified for hazardous and non-hazardous locations; NEMA ICS 2-230 noise immunity rating.

Technical Specifications

Output Voltage Range (AC): 5–265 VAC, 50/60 Hz
Output Voltage Range (DC): 5–125 VDC
Number of Outputs: 8 normally open relay contacts
Contact Rating (120V AC): 30 A make, 30 A break
Contact Rating (240V AC): 15 A make, 1.5 A break
Contact Rating (24V DC): 1.2 A make, 1.2 A break
Contact Rating (125V DC): 0.22 A make, 0.22 A break
Continuous Current per Point: 2.5 A at 120/240V AC; 1 A at 125V DC; 2 A at 24V DC
Signal Delay: 10 ms (ON); 10 ms (OFF) at maximum resistive load
Backplane Current (5V DC): 85 mA
Backplane Current (24V DC): 90 mA
Heat Dissipation per Point: 0.825 W
Total Module Dissipation: 8.60 W (all outputs energized); 2.59 W (minimum)
Operating Temperature Range: 0–60°C (32–140°F)
Storage Temperature Range: −40–85°C (−40–185°F)
Operating Humidity: 5–95% non-condensing
Isolation Voltage: 1500V between I/O terminals and control logic
Noise Immunity Standard: NEMA ICS 2-230
Operating Vibration: 0.015″ displacement at 5–57 Hz; 2.5 g at 57–2000 Hz
Operating Shock: 10 g
Enclosure Type: Open (rack/chassis mounted)
Certifications: UL, CSA, CE; Class 1, Division 2 hazardous location endorsement
Series: SLC 500 (1746 family)

Typical Applications

Motor and Drive Control: Switching AC and DC motor starters, soft starters, and variable frequency drives via isolated relay contacts.
Solenoid Valve Actuation: Control hydraulic and pneumatic solenoids across multiple voltage systems without common return paths.
Indicator Lamps and Horns: Drive visual and audible alarm devices in packaging, automotive, and food processing lines.
Equipment Interlocks: Manage safety interlocks for machine guards, presence sensing, and emergency shutdown circuits.
Load Shedding and Power Distribution: Switch heating elements, compressors, and auxiliary loads in process control and facility management.
Legacy System Integration: Retrofit and maintain existing SLC 500 installations requiring high-current relay switching without platform migration.