The Allen Bradley 1771-OC is a PLC-5 series DC digital output module designed for the 1771 I/O chassis platform. It provides reliable switching control for industrial DC loads such as solenoids, motor starters, indicators, and control relays.
Unlike high-density output modules, the 1771-OC is a compact 8-point output module, designed for applications requiring robust switching performance with simplified channel grouping and strong electrical protection.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Catalog Number | 1771-OC |
| Module Type | DC Digital Output Module |
| System Family | PLC-5 / 1771 I/O |
| Output Channels | 8 outputs |
| Output Voltage Range | 42–53V DC (typical 48V DC systems) |
| Output Type | DC sourcing output driver |
| Continuous Current per Point | up to 1.5 A |
| Maximum Module Current | 8 A total |
| Surge Current | up to 4 A (short duration) |
| On-State Voltage Drop | ≤ 2.0 V DC |
| Off-State Leakage Current | ≤ 5 mA |
| Switching Delay | ~10 ms ON/OFF |
| Backplane Current Draw | ~165 mA @ 5 V DC |
| Isolation | Optical isolation between logic and field side |
| Wiring Arm | 1771-WA |
| 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-OC module is designed for medium-power DC load switching in PLC-5 automation systems. It receives control commands from the processor and drives external field devices with stable DC output signals.
Core functions include:
- DC actuator control (solenoids, valves)
- Motor starter interface switching
- Industrial indicator and alarm control
- Process automation output control
- Reliable discrete DC load driving
It is widely used in legacy industrial systems requiring dependable DC output performance.
Recommended Related Modules
| Model | Function |
|---|---|
| 1771-OBD | 16-point DC output module |
| 1771-OAD | AC output module |
| 1771-IBD | DC input module |
| 1771-IBN | High-density DC input module |
| 1771-IFE | Analog input module |
| 1771-ASB | Remote I/O adapter |
Popular Allen Bradley PLC-5 Modules
| Model | Function |
|---|---|
| 1785-L40B | PLC-5 processor |
| 1771-A4B | 16-slot I/O chassis |
| 1771-DMC | Data Highway communication module |
| 1771-SN | I/O scanner module |
| 1771-ALX | Local I/O adapter module |
