Allen-Bradley 1746-OA16 SLC500 AC Output Module

1746-OA16 Allen-Bradley Digital AC Output Module

Product Introduction

The Allen-Bradley 1746-OA16 provides a robust solution for controlling AC loads in industrial environments. As a core component of the SLC500 system, this module drives up to sixteen independent output channels. It handles nominal voltages of 120 or 240 VAC. Furthermore, its broad operating range accommodates fluctuations from 85 to 264 VAC. This flexibility makes it suitable for diverse global power conditions. The 1746-OA16 features two isolated groups with eight outputs each, simplifying wiring and group control. Its design emphasizes reliability and ease of use for automation engineers.

Technical Specifications

Output Characteristics
The module offers sixteen discrete outputs organized into two groups of eight. Each channel supports a continuous current of 0.50 A at 30 °C. However, this derates to 0.25 A at 60 °C for thermal protection. The total module current reaches 8.0 A at 30 °C, reducing to 4.0 A at 60 °C. Additionally, each point can handle a surge current of 10.0 A for 25 milliseconds. The output delay from OFF to ON is 11.0 ms, while the ON to OFF delay is only 1 ms. Its OFF-state leakage current stays at a low 2 mA, preventing false triggering of sensitive loads.

Power and Electrical Data
This output module draws 370 mA from the 5.1 VDC backplane. It also requires 316 mA from the system power supply. The module supports a frequency range of 47 to 63 Hz. Moreover, the on-state voltage drop measures only 1.50 V at 0.50 A, minimizing power loss. The load current is rated at 10 mA per channel. These electrical characteristics ensure efficient operation within the SLC500 chassis.

Isolation and Protection
The 1746-OA16 includes optical coupling between the backplane and output circuits. This provides vital isolation against electrical noise. Filter circuitry further reduces signal interference, ensuring stable performance in electrically noisy environments. Consequently, the module maintains reliable operation even near heavy inductive loads like motors or solenoids.

Mechanical and Environmental Parameters

Physical Dimensions
This module occupies a single slot in the SLC500 chassis. Its compact form factor allows high-density I/O configurations. The removable terminal blocks simplify installation and maintenance. You can replace the module without disconnecting field wiring, saving significant downtime.

Operating Conditions
The Allen-Bradley 1746-OA16 functions reliably across a temperature range of 0 °C to 60 °C (32 °F to 140 °F). Additionally, it withstands relative humidity from 5% to 95%, non-condensing. These specs suit it for factory floors and control cabinets. Always ensure adequate ventilation around the chassis for optimal thermal performance.

Installation and Integration Guide

Chassis Installation
First, confirm your system power supply can handle the total current draw of all installed modules. The 1746-OA16 consumes 0.370 A at 5.1 VDC. Next, insert the module into any available slot in the SLC500 rack. Apply firm, even pressure until it seats securely. Finally, tighten the retaining screws to secure it against vibration.

Wiring Connections
Use the removable terminal blocks for easy wiring. Connect your AC loads to the appropriate channel terminals. The two groups can use different AC sources if needed. However, ensure each group's voltage matches within its specified range. For best results, use twisted-pair wiring for input power connections. This practice minimizes induced noise.

Addressing and Programming
The 1746-OA16 occupies 16 bits of I/O memory. Each output corresponds to a specific bit in the processor's output image table. Your SLC500 processor accesses these values via standard ladder logic instructions. For instance, use an OTE (Output Energize) instruction to control each point. The module's LED indicators provide immediate visual status for each channel, aiding troubleshooting.

Packaging List

• Allen-Bradley 1746-OA16 Digital AC Output Module (1 unit)

• Removable terminal block connectors (2 units)

• Installation instruction sheet

Note: Cables, software, and configuration tools are sold separately.

Shipping Information

We ship all orders via FedEx, UPS, or DHL. Tracking numbers are provided upon dispatch. Please verify your address and contact details for seamless delivery.

Frequently Asked Questions

1. Can I use the 1746-OA16 with a ControlLogix processor?
Yes, you can. The 1746-OA16 works with SLC500 processors directly. Additionally, it integrates with ControlLogix and CompactLogix systems using a 1746 adapter or remote I/O configuration.

2. What happens if I exceed the maximum current per output?
Exceeding the rated current may trigger thermal shutdown or permanently damage the output triac. For long-term reliability, never exceed 0.5 A per point at 30 °C. Derate accordingly at higher temperatures.

3. Does this module support DC loads?
No, this module is designed exclusively for AC loads. Using it with DC voltage can damage the internal circuitry. For DC outputs, consider the 1746-OB series modules instead.

4. How do I check the output status without a programming terminal?
Each output channel has a dedicated green LED indicator on the module's front panel. A lit LED confirms the output is energized, providing quick visual verification during operation.

5. Is the 1746-OA16 suitable for controlling motor starters?
Yes, it is commonly used for controlling AC contactors and motor starters. However, ensure your starter coil current stays within the module's per-point limit. Use an interposing relay if the coil draws more than 0.5 A.