The Allen Bradley 1771-OBD is a PLC-5 series DC digital output module designed for the 1771 I/O chassis platform. It is used to control 24V DC field devices such as solenoids, relays, indicators, and small actuators in industrial automation systems.
This module provides reliable transistor-based switching performance, making it suitable for fast and stable DC output control in discrete manufacturing and process automation environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Catalog Number | 1771-OBD |
| Module Type | DC Digital Output Module |
| System Family | PLC-5 / 1771 I/O |
| Output Channels | 16 outputs |
| Output Voltage Range | 10–30V DC |
| Nominal Voltage | 24V DC |
| Output Type | Transistor (sink/source depending on wiring) |
| Continuous Current per Point | 0.5 A |
| Max Module Current | 8 A |
| Leakage Current | ≤ 1 mA |
| On-State Voltage Drop | ≤ 1.2 V DC |
| Switching Response | Fast DC switching |
| Backplane Current Draw | ~300 mA @ 5 V DC |
| Isolation | Optical isolation between field and logic |
| Wiring Arm | 1771-WH |
| Mounting Type | 1771 chassis slot |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Weight | ~0.45 kg |
| Dimensions (L×W×H) | 203 mm × 76 mm × 127 mm |
System Role Overview
The 1771-OBD module is designed for digital output control of DC field devices within PLC-5 systems. It receives control signals from the processor and switches external loads accordingly.
Core functions include:
- DC actuator and solenoid control
- Relay and indicator output switching
- High-speed discrete output operation
- Integration with PLC-5 control architecture
- Reliable industrial load driving capability
It is widely used in machine automation and process control systems requiring stable DC output performance.
Recommended Related Modules
| Model | Function |
|---|---|
| 1771-IBD | DC digital input module |
| 1771-IBN | High-density DC input module |
| 1771-IAD | AC input module |
| 1771-OAD | AC output module |
| 1771-OWNA | Relay output module |
| 1771-IFE | Analog input module |
Popular Allen Bradley PLC-5 Modules
| Model | Function |
|---|---|
| 1785-L40B | PLC-5 processor |
| 1771-A4B | 16-slot I/O chassis |
| 1771-DMC | Communication module |
| 1771-SN | I/O scanner module |
| 1771-ALX | Local I/O adapter module |
