1746-OA16 is a 16-point AC triac digital output module built for the Allen‑Bradley SLC 500 PLC chassis system from Rockwell Automation. Designed to switch standard alternating-current loads, this module is widely deployed in legacy discrete control applications where the controller needs to drive solenoid valves, motor contactors, relay coils, indicator lamps and other AC field devices. It is a common end-of-life spare for factories still running stable SLC 500 control racks, used during shutdown maintenance and spare part stocking programs.

The 16 output channels are split into four electrically isolated groups of four points each. This grouping lets users separate different voltage zones or load circuits, reducing the risk that a fault on one branch takes down the entire output bank. Each channel uses triac switching with zero-cross turn-on, which suppresses electrical noise and inrush current spikes when switching inductive loads. Front-panel LED indicators provide instant status feedback for every individual channel, simplifying field troubleshooting and commissioning checks.

We supply visually inspected and functionally tested 1746-OA16 units, including new old stock and refurbished surplus inventory. Every module is validated for backplane communication, channel switching performance, isolation integrity and LED operation before shipment, ready for direct drop-in installation into standard SLC 500 I/O racks.

Key Features

Allen‑Bradley 1746-OA16, 16-point AC triac digital output module for SLC 500 Operating AC voltage range: 85 VAC to 265 VAC 16 outputs divided into four isolated groups, four channels per group Zero-cross triac switching to minimise EMI and inrush transients Individual status LED for each output channel Removable wiring terminal block for easy service and replacement Backplane powered, designed for standard SLC 500 chassis installation Compatible with all mainstream SLC processors: 5/01, 5/02, 5/03, 5/04, 5/05 Suitable for resistive and moderate inductive AC loads Built-in overvoltage and transient suppression for each channel Common spare for legacy discrete manufacturing and process control systems Discontinued EOL hardware, available as tested surplus / NOS stock

Product Specifications

Part number: 1746-OA16 Manufacturer: Allen‑Bradley / Rockwell Automation Platform: SLC 500 PLC Module type: AC Digital Output Channel count: 16 outputs Output technology: Triac, zero-cross switching Operating voltage: 85–265 VAC, 47–63 Hz Rated current per point: 1 A continuous Rated current per group: 4 A continuous Surge current: 10 A for 8 ms maximum Isolation: Groups isolated from each other and backplane Status indication: One LED per channel Operating temperature: 0 °C to +60 °C Relative humidity: 5%–95%, non-condensing Backplane current draw: 120 mA at 5 VDC Mounting: SLC 500 I/O chassis backplane Termination: Screw terminal block Certifications: UL, CSA, CE

Typical Applications

Factory conveyor discrete control Solenoid valve actuation for pneumatic and hydraulic circuits Motor starter and contactor coil driving Process plant alarm beacon and indicator light control Packaging machine and material handling automation HVAC and boiler auxiliary equipment control Refinery and chemical plant legacy discrete I/O replacement Water and wastewater treatment valve and pump control Food & beverage production line machine control SLC 500 system spare stocking and outage maintenance

Why Choose Our 1746-OA16 Module

We specialise in hard-to-source Rockwell SLC 500 discontinued I/O, processors and power supplies for plant maintenance teams, system integrators and automation contractors. Since the 1746 series is no longer actively manufactured, pre-tested spare cards are critical to avoid unexpected downtime for production lines relying on SLC racks. Each 1746-OA16 undergoes full channel switching testing, isolation check, backplane communication verification and terminal inspection prior to dispatch.

We support consolidated shipping with other SLC 500 spares including power supplies, CPU cards, analog modules, relay outputs and input cards. Formal commercial invoices, packing lists and optional test records are available on request. Tiered pricing and long-term plant spare frame agreements are offered for bulk orders. Submit your full part list and target delivery time for a custom quotation.

Related Search Keywords

1746-OA16, Allen Bradley 1746-OA16, SLC 500 AC output module, 1746OA16 triac output card, Rockwell 1746-OA16, 16 point AC PLC output module, SLC500 digital output module, 1746-OA16 zero cross triac, legacy SLC discrete I/O spare, 1746-OA16 isolated output group.

FAQ

What is the difference between 1746-OA16 and 1746-OW16? 1746-OA16 is an AC triac output for 85–265 VAC loads. The 1746-OW16 uses mechanical relay contacts and can switch either AC or DC, but has limited switching cycle life. They are not direct equivalents.

Can this module drive large motors directly? No. It is designed for control loads such as relay coils and solenoids. It should switch a contactor, not the main motor power circuit.

Will it work with SLC 5/05 processors? Yes, the 1746-OA16 is fully compatible with all standard modular and fixed SLC 500 processors.

Is this module still available new from Rockwell? The SLC 500 product family is discontinued. New factory stock is no longer available; supply is limited to new old stock and tested refurbished units.

Can I use this for 24 VDC loads? No. This is an AC triac module and will not reliably switch DC signals. Use dedicated DC output or relay modules for DC loads.

Do you want the matching category short description and image alt text library, or continue to the next part number?

1746-OA16