1746-OX8 SLC 500 | Allen Bradley | Isolated Relay Digital Output Module

Product Overview

The Allen Bradley 1746-OX8 functions as a high-capacity digital output interface for the SLC 500 PLC platform. It provides eight independent, individually isolated relay contacts, allowing the controller to switch diverse load types across varying voltage ranges. While the manufacturer has officially discontinued this series, we provide this unit in 100% Brand New, original condition, offering a critical lifecycle extension for your existing automation racks without requiring a full system migration.

Technical Specifications

The 1746-OX8 utilizes a robust electromechanical design to handle high-current switching tasks:

Engineering Advantages

• Total Channel Isolation: Unlike standard output modules that share a common return, the 1746-OX8 isolates each of its eight points. This allows you to mix different voltages and phases (e.g., 24VDC and 230VAC) on a single module, significantly reducing the hardware footprint in the chassis.

• High-Current Capability: Each point supports up to 5 Amps. This eliminates the need for interposing relays when driving larger solenoids, motor starters, or industrial heaters, simplifying your control cabinet wiring.

• EMI Immunity: The physical separation provided by isolated relay contacts prevents electrical noise from back-feeding into the PLC backplane. This ensures stable CPU operation even when switching inductive loads that generate significant back-EMF.

• Simplified Maintenance: The integrated screw terminals provide a secure, vibration-resistant connection. The removable terminal block allows for "hot-swapping" module hardware without disconnecting field wiring, minimizing Mean Time to Repair (MTTR).

FAQs

Q: Can I use the 1746-OX8 in any slot of an SLC 500 chassis?

A: Yes. The 1746-OX8 installs into any available I/O slot of a 1746 chassis, except for Slot 0, which is reserved for the processor.

Q: Does this module require an external power supply for the relays?

A: The module draws its operating power (backplane current) from the chassis power supply. However, the field-side loads require their own external power source connected through the isolated relay contacts.

Q: How does the 1746-OX8 handle inductive load surges?

A: While the relay contacts are rated for 5 Amps, we recommend installing external surge suppression (such as an RC network for AC or a diode for DC) when switching highly inductive loads to extend the contact life of the module.

Q: Is this a "New" or "Refurbished" unit?

A: This is a 100% Brand New original unit. Despite the manufacturer's discontinued status, we supply authentic, unused hardware to ensure the highest reliability for your legacy control systems.