The Allen-Bradley 1746-OA16, also cataloged as the 1746-OA16 AC Output Module, operates as a dedicated hardware component for discrete AC load switching within SLC 500 chassis architectures.

Part Number Breakdown & Variant Matrix

The Allen-Bradley 1746-OA16 is a 16-channel solid-state AC output module belonging to the 1746 I/O family. Alternate hardware designations for this model include spare part references 1746-0A16, 1746-OA16/A, 1746-OA16/B, 1746-OA16/C, and 1746-OA16/D. The assembly provides 120/240 V AC control for field devices across a wide load voltage spectrum.

Physical & Technical Specifications

Backplane Logic & System Scaling

The module connects to the 1746 local rack bus to send and receive binary output signals under controller logic command. In systems linked across EtherNet/IP deterministic networks, state adjustments route through central processors with minimal cycle latency. The internal logic structure supports firmware flash compatibility protocols through host controllers, while providing high I/O density scaling in multi-slot 1746 expansion chassis.

Itemized Package Inventory

• 1 x 1746-OA16 16-Point Solid-State AC Output Module
• 1 x Removable Terminal Block Assembly
• 1 x Product Installation Instruction Leaflet

Wiring Regulations & Slot Installation

• Remove main power from the SLC 500 chassis backplane before inserting or extracting the module.
• Insert the module into any available 1746 chassis slot until top and bottom module latches snap flush into place.
• Terminate external 85-265 V AC field wiring on the removable terminal block header using appropriate line protection fuses.
• Route high-voltage AC load lines in dedicated wiring ducts separated from sensitive low-voltage DC communication cables.
• Ensure the SLC 500 chassis frame ground terminal is attached directly to the main control enclosure earth busbar.

Technical Engineering FAQ

• What is the backplane current draw for the 1746-OA16?

  The 1746-OA16 draws 370 mA from the 5 V DC backplane power supply integrated into the SLC 500 chassis.

• Can the 1746-OA16 be installed under power?

  No, the 1746 chassis system does not support module replacement under power; the system must be de-energized first.

• What operating line voltage range is supported by the output points?

  Each channel accommodates field load operating voltages from 85 to 265 V AC at standard frequencies of 47 to 63 Hz.

• How many discrete output channels are available on this module?

  The module provides 16 individual solid-state AC switching outputs arranged across the front terminal interface.

• Does the module require an external power supply for field loads?

  Yes, an external AC supply voltage between 85 and 265 V AC must be wired to drive connected field devices.

• How are field wires connected to the front panel?

  Field wiring connects directly to a removable terminal block (RTB) that plugs onto the module front housing connector.

• What ambient temperature range is rated for operation?

  The module is specified to operate in ambient control cabinet environments ranging from 0 up to 60 deg C.

• How should field output cables be routed inside the control panel?

  AC load output conductors must be routed away from low-voltage signal lines in separate wireways to reduce electromagnetic interference.