Overview
The Allen-Bradley 1746-OX8 is a digital contact output module designed for the SLC 500 programmable logic controller platform. This module provides 8 individually isolated, high-current relay contact outputs for controlling motor starters, solenoids, relays, and other high-power devices in industrial automation systems. The 1746-OX8 is built to NEMA ICS 2-230 noise immunity standards and includes optical isolation and surge suppression to protect against voltage transients.
Key Features
- 8 N.O. (normally open) relay contact outputs, individually isolated
- Operating voltage: 5–265V AC (50/60 Hz) or 5–125V DC
- High-current relay ratings: up to 30 A at 120V AC and 1.2 A at 24V DC
- Electro-optical isolation: 1500V between I/O terminals and control logic
- Open-type chassis mounting with screw terminals
- Status display indicators and surge suppression built-in
- UL, CSA, and CE certified for industrial applications
Technical Specifications
The 1746-OX8 module delivers robust relay switching across a wide voltage range with fail-safe isolation. Output capacity is limited to 1440 VA continuous per module. The module operates reliably across a full industrial temperature range and integrates seamlessly into existing SLC 500 control architectures.
- Output Points: 8 relay contacts
- Output Signal Range: 5–265V AC (50/60 Hz) or 5–125V DC
- Relay Contact Ratings (AC): 30 A make/break @ 120V AC; 15 A make/1.5 A break @ 240V AC; 5 A continuous @ 3600 VA make
- Relay Contact Ratings (DC): 0.22 A @ 125V DC; 1.2 A @ 24V DC; continuous 1 A @ 125V DC, 2 A @ 24V DC
- Isolation: 1500V electro-optical isolation between I/O and logic
- Backplane Current: 85 mA @ 5V DC or 90 mA @ 24V DC
- Operating Temperature: 0–60°C (32–140°F)
- Storage Temperature: −40–85°C (−40–185°F)
- Heat Dissipation: 0.825 W per point (total 8.60 W)
- Mounting: Rack mount (chassis-based)
- Terminal Type: Screw terminals
- Enclosure: Open-style
- Certifications: UL, CSA, CE
- Series: Series A
Typical Applications
The 1746-OX8 is ideal for industrial control systems requiring isolated relay outputs, including:
- Motor starter and contactor control
- High-current solenoid and valve switching
- Alarm and indicator light circuits
- Safety interlock and emergency stop circuits
- Process control with isolated load switching
- HVAC and facility automation systems
Compatibility & Replacements
Compatible With
- SLC 500 programmable logic controllers (all platforms)
- Allen-Bradley I/O chassis and 1746 series backplanes
- CompactLogix (with appropriate gateway configuration)
- Studio 5000 and RSLogix 500 programming software
- Modbus and Ethernet networks via external gateways
Replaces / Drop-In Replacement For
- Earlier generations of Allen-Bradley 1746-OX8 modules (Series A)
- Comparable isolated relay output modules rated for 8-point SLC 500 applications
- Verify exact compatibility with your existing SLC 500 system before ordering
Works With
- Software: RSLogix 500, Studio 5000
- Communication: SLC 500 native backplane control
- Networks: EtherNet/IP (via CompactLogix gateway or ControlLogix bridge)
- Protocols: Allen-Bradley proprietary I/O scanning
