Description
Description
The Allen-Bradley 1746-OA8 is a high-performance discrete output module engineered for the SLC 500 programmable controller platform. This module provides eight (8) isolated AC output channels, designed to interface with 120/240V AC industrial loads. It is specifically suited for controlling devices such as motor starters, solenoid valves, and indicator lamps in demanding industrial control environments.
Features
- Eight (8) discrete AC output points.
- Organized into two (2) isolated groups of four (4) outputs each, allowing for independent power source or phase usage.
- Wide operating voltage range of 85 to 264V AC.
- High surge current capacity of 10.0 Amps for 25 ms per point to accommodate inductive loads.
- Compact SLC 500 form factor for efficient rack mounting.
Applications
This module is widely used in manufacturing and process automation for the control of AC-powered field devices. Typical applications include the operation of contactors, relays, and pilot lights within automated assembly lines, packaging machinery, and material handling systems.
Technical Specifications
| Brand |
Allen-Bradley |
| Product Line |
SLC 500 |
| Module Type |
Discrete AC Output |
| Number of Outputs |
8 (2 groups of 4) |
| Nominal Voltage |
120 / 240V AC |
| Operating Voltage Range |
85-264V AC |
| Backplane Current (5V DC) |
185 mA |
| On-Signal Delay |
1 ms (max resistive load) |
| Off-Signal Delay |
11 ms (max resistive load) |
| On-State Voltage Drop |
1.5V at 1.0 A |
| Surge Current |
10.0 Amps for 25 ms (per point) |
| Operating Temperature |
0 to 60 degC (32 to 140 degF) |
Installation Guidelines
- Ensure the SLC 500 chassis power is disconnected before installing or removing the module.
- Insert the module into any available slot in the SLC 500 chassis, ensuring proper alignment with the backplane connector.
- Secure the module using the provided mounting screws to ensure a reliable electrical connection and mechanical stability.
- Use appropriate wire gauges for the terminal block connections and ensure all wiring is routed away from high-voltage AC lines or EMI sources to prevent signal interference.
- Verify that the external power source connected to the module matches the specified voltage range to prevent damage.
- Handle the module using ESD-safe practices to prevent damage to sensitive internal circuitry.
FAQ
What is the benefit of the isolated groups in the 1746-OA8?
The 1746-OA8 features two isolated groups of four outputs. This allows the user to operate the module using two different power sources or phases, providing greater flexibility in circuit design and preventing a fault in one power circuit from affecting the other group.
Can this module be used for 240V AC applications?
Yes, the 1746-OA8 is designed for both 120V and 240V AC applications, with an operating range of 85 to 264V AC.
