Product Overview
The Allen-Bradley 1771-OZL/A Digital Output Module is a high-performance AC digital output module manufactured by Rockwell Automation under the Allen-Bradley brand. Designed for use within the PLC-5 programmable controller ecosystem, the Allen-Bradley 1771-OZL/A Digital Output Module provides four optically isolated AC output channels capable of directly switching 120/240V AC loads without the need for intermediate relays. This module serves as a critical interface between a PLC-5 processor and industrial field devices such as motor starters, solenoid valves, contactor coils, indicator lights, and heating elements. With its robust construction and high-voltage switching capability, the Allen-Bradley 1771-OZL/A Digital Output Module remains a trusted component for maintaining and extending the operational life of legacy PLC-5 control systems across a wide range of industrial applications.
Each output channel of the Allen-Bradley 1771-OZL/A Digital Output Module features individual optical isolation, providing a high degree of electrical separation between the controller-side logic and the field-side AC load circuits. This isolation protects the sensitive backplane electronics from voltage transients, ground loops, and electrical noise that are commonly present in industrial environments. The module’s triac-based output stages are capable of switching AC loads with a maximum current of 2A per channel, with a total module current rating of 8A when all four outputs are energized. The Allen-Bradley 1771-OZL/A Digital Output Module operates with a fast ON response time of 1.5 ms and an OFF response time of 8.3 ms (at 60 Hz), making it suitable for applications requiring precise timing and rapid load switching.
The Allen-Bradley 1771-OZL/A Digital Output Module is engineered for straightforward installation and maintenance within the 1771 I/O chassis system. It mounts directly into any available slot in a Series A or B 1771 chassis and communicates with the PLC-5 processor through the chassis backplane, drawing 550 mA at 5V DC. The module is compatible with the 1771-WH field wiring arm, which provides a quick-connect interface for field wiring and allows the module to be removed and replaced without disturbing the connected field wires. With its wide operating voltage range, robust isolation, and fast switching performance, the Allen-Bradley 1771-OZL/A Digital Output Module delivers the reliable AC output control that engineers rely on for demanding industrial automation applications.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Allen-Bradley 1771-OZL (Series A) |
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Product Type | Digital AC Output Module |
| Series/Platform | PLC-5 / Bulletin 1771 I/O |
| Number of Outputs | 4 (optically isolated) |
| Output Type | AC (Triac) |
| Operating Voltage (AC) | 120/240V AC (47–63 Hz) |
| Current Rating (per channel) | 2A maximum |
| Total Module Current | 8A maximum (all outputs ON) |
| Voltage Drop (ON state) | 1.5V maximum at 2A |
| Leakage Current (OFF state) | 5 mA maximum |
| ON Response Time | 1.5 ms |
| OFF Response Time | 8.3 ms (at 60 Hz) |
| Isolation Method | Optical isolation (per channel) |
| Isolation Voltage | 1500V AC for 1 minute |
| Backplane Current Draw | 550 mA @ 5V DC |
| Chassis Compatibility | 1771 Series A or B I/O chassis |
| Wiring Arm | 1771-WH field wiring arm |
| Module Location | Any slot in 1771 I/O chassis |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Relative Humidity | 5% to 95% non-condensing |
| Dimensions (H × W × D) | 140 × 44 × 120 mm (5.51 × 1.73 × 4.72 in.) |
| Weight | Approx. 0.45 kg (1.00 lb) |
| Mounting | 1771 chassis rack mount |
| Certifications | UL 508, c-UL, CE |
| Country of Origin | United States |
