The Allen-Bradley 1746-OW16, also cataloged as the 1746-OW16 Digital Output Module, operates as a dedicated hardware component for relay switching control within the SLC 500 PLC system. The module provides 16 relay output points for discrete load control applications.

Model Identification

Hardware Specifications

EtherNet/IP and Industrial Control Integration

The 1746-OW16 operates as a discrete output interface within the SLC 500 control architecture. The module receives output commands through the SLC backplane communication bus and converts processor instructions into relay contact switching actions.

For Allen-Bradley PLC systems, I/O density scaling depends on chassis configuration, processor capability, and available backplane resources. The module communicates through the SLC 500 backplane rather than direct Ethernet or field network protocols.

Relay outputs provide electrical isolation between the PLC logic circuit and external field devices. Proper load classification, suppression components, and wiring separation are required when controlling inductive equipment such as contactors, solenoids, or motor starters.

Ordering Information

• 1 x Allen-Bradley 1746-OW16 SLC 500 16 Point Relay Output Module
• 1 x Standard industrial protective packaging
• 1 x Product identification label

Field Installation Guidelines

Module Mounting

• Install the module in a compatible SLC 500 chassis slot.
• Verify chassis power is removed before installation or removal.
• Confirm slot addressing and controller configuration before operation.

Field Wiring

• Use appropriate wire sizing according to the connected load current.
• Separate relay output wiring from low-level analog signal wiring.
• Install external suppression devices for inductive loads where required.

Electrical Verification

• Confirm output voltage compatibility before connecting field devices.
• Check relay contact ratings against the application load.
• Verify grounding and cabinet wiring practices before energizing the system.

Technical Questions and Answers

• What is the function of the 1746-OW16 module?

  The 1746-OW16 provides 16 relay output points for switching external field devices from an SLC 500 PLC processor.

• Does the 1746-OW16 use transistor outputs?

  No. The module uses relay outputs, allowing switching of AC and DC loads within the specified voltage ratings.

• Can the module be installed in any SLC 500 chassis?

  Installation requires a compatible SLC 500 chassis and proper processor configuration within the controller system.

• Does the 1746-OW16 communicate through Ethernet?

  No. The module exchanges data through the SLC 500 backplane communication interface.

• What voltage loads can the relay outputs handle?

  The module supports output switching applications up to 250 VAC or 125 VDC according to the provided specifications.

• Is hot swapping supported for the 1746-OW16?

  Power should be removed before module installation or removal. Hot swap operation is not specified.

• Are external protection components required?

  Inductive loads may require suppression components to reduce electrical noise and protect relay contacts.

• What should be checked before commissioning?

  Verify wiring, load ratings, slot configuration, and controller recognition before applying field power.