The Allen-Bradley 1746-OX8, also cataloged as the 1746-OX8 Relay Output Module, operates as a dedicated hardware component for switching external field devices through isolated relay contacts within the SLC 500 control platform.

Model Identification

The 1746-OX8 is an SLC 500 digital output module designed with isolated normally open relay contacts. It provides eight output points for discrete load switching applications and interfaces directly with the SLC 500 chassis backplane.

Hardware Specifications

Industrial Control Network Compatibility

The 1746-OX8 operates as an SLC 500 I/O expansion component using the SLC backplane communication structure. The module receives output commands from the processor and converts internal logic states into physical relay contact switching.

The Allen-Bradley SLC platform uses deterministic backplane communication for discrete control execution. Module addressing, output image updates, and controller communication are handled through the SLC processor scan cycle.

Ordering Information

• 1 x Allen-Bradley 1746-OX8 Relay Output Module
• Compatible with Allen-Bradley SLC 500 chassis systems
• Includes integrated relay output hardware
• Terminal block and additional accessories are not included unless specified

Field Installation Guidelines

Mounting and Wiring

• Install the module in an available SLC 500 chassis slot.
• Verify controller power is removed before module insertion or removal.
• Connect field wiring according to relay output contact specifications.
• Separate relay wiring from low-level signal wiring to reduce electrical interference.
• Confirm external load current does not exceed relay contact ratings.

PLC Configuration

• Configure the module within the SLC 500 I/O image table.
• Verify output addressing matches the processor program configuration.
• Check relay contact operation before connecting final field loads.

Frequently Asked Questions

• Does the 1746-OX8 provide transistor outputs?

  No. The 1746-OX8 uses isolated normally open relay contacts for switching external loads.

• How many output channels are available on this module?

  The module provides 8 relay output points controlled through the SLC 500 backplane.

• Can the 1746-OX8 switch both AC and DC loads?

  Yes. The relay contacts support AC and DC switching within the specified voltage and current limits.

• Is the 1746-OX8 hot-swappable?

  The module should not be inserted or removed from an energized chassis. Follow SLC 500 installation procedures.

• What type of output isolation is provided?

  Each relay output uses isolated mechanical contacts to provide separation between controller logic and field circuits.

• What communication protocol does this module use?

  The module communicates through the SLC 500 chassis backplane and does not use a separate network interface.

• What environmental conditions are supported?

  The module operates from 0 to 60 deg C with 5 to 95% noncondensing humidity.

• Does the module require firmware configuration?

  The 1746-OX8 is configured through the SLC 500 processor I/O configuration and does not require separate firmware loading.