Excellent PLC
Product Introduction
The Allen-Bradley 1746-OW4 is a relay-based digital output module designed for the SLC 500 PLC system. Unlike transistor output modules, this unit uses electromechanical relays, allowing it to switch both AC and DC loads with a wide voltage range.
The module provides 4 independent relay output channels, making it suitable for applications requiring flexible voltage switching. Each relay contact can handle loads from 5–265V AC or 5–125V DC, enabling control of a broad range of field devices such as motors, lamps, solenoids, and contactors.
Thanks to its relay output design, the 1746-OW4 offers electrical isolation between control logic and field devices, making it especially useful in mixed-voltage environments. It is widely used in industrial systems where versatility and robustness are more important than high-speed switching.
Product Specifications
| Parameter | Description |
|---|---|
| Manufacturer | Allen-Bradley |
| Series | SLC 500 |
| Module Type | Relay Digital Output Module |
| Catalog Number | 1746-OW4 |
| Number of Channels | 4 Outputs |
| Output Type | Electromechanical Relay |
| Output Voltage Range (AC) | 5–265V AC |
| Output Voltage Range (DC) | 5–125V DC |
| Contact Type | Normally Open (NO) |
| Isolation | Channel-to-channel isolation via relay contacts |
| Switching Speed | Slower than solid-state modules |
| Backplane Current Consumption | Approx. 0.050 A |
| Contact Life | Depends on load type and switching frequency |
| Operating Temperature | 0 to 60°C |
| Storage Temperature | -40 to 85°C |
| Installation | SLC 500 Chassis |
| Wiring Category | Category 2 |
| Dimensions | 144.5 × 34.6 × 130.18 mm |
| Weight | 0.45 kg |
Applications
● Mixed Voltage Control Systems
Ideal for applications where both AC and DC loads must be controlled within the same system.
● Industrial Machinery Control
Used to switch motors, contactors, and other high-voltage devices.
● Lighting and Signaling Systems
Controls lamps, indicators, and alarms across various voltage levels.
● Process Automation
Suitable for systems requiring reliable relay-based switching with isolation.
● Retrofit and Legacy Systems
Commonly used when replacing older relay-based control systems.
Advantages
● Wide Voltage Compatibility
Supports both AC and DC loads, offering excellent flexibility.
● Electrical Isolation
Relay contacts provide natural isolation between control and load circuits.
● Robust Load Handling
Capable of switching higher voltages compared to transistor outputs.
● Versatile Applications
Suitable for a wide range of industrial control scenarios.
● Simple Integration
Easily installs into standard SLC 500 chassis.
● Reliable Mechanical Switching
Well-suited for applications where switching speed is not critical.
