The Allen Bradley 1771-OFE2 is a PLC-5 series isolated analog current output module designed for the 1771 I/O platform. It converts digital control signals from the PLC processor into precise 4–20 mA analog current outputs, commonly used for industrial process control and closed-loop automation systems.
This module is widely applied in industries requiring stable, noise-resistant signal transmission for controlling valves, drives, and process instrumentation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Catalog Number | 1771-OFE2 |
| Module Type | Analog Current Output Module |
| System Family | PLC-5 / 1771 I/O |
| Output Channels | 4 isolated outputs |
| Output Signal Range | 4–20 mA DC |
| Resolution | 12-bit digital-to-analog conversion |
| Accuracy | ±0.1% full scale (typical) |
| Channel Isolation | 1000V differential isolation |
| Load Resistance | Up to ~1200 Ω per channel |
| Output Type | Current loop (PID / process control) |
| Update Time | ~1.6 ms (binary mode) / ~8 ms (BCD mode) |
| Data Format | Binary / BCD scaling |
| Backplane Current Draw | ~1.5 A @ 5 V DC |
| Power Dissipation | ~7.9 W |
| Thermal Dissipation | ~26.9 BTU/hr |
| Wiring Arm | 1771-WC |
| Mounting Type | 1771 chassis slot (1-slot width) |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Weight | ~0.57 kg |
| Dimensions (L×W×H) | 327 mm × 242 mm × 54 mm |
System Role Overview
The 1771-OFE2 module is designed for precision analog current output control in PLC-5 automation systems. It provides stable 4–20 mA signals used to regulate industrial equipment with high reliability and low noise susceptibility.
Core functions include:
- Process valve positioning control
- Variable speed drive (VFD) reference output
- PID loop control signal generation
- Industrial actuator modulation
- Analog instrumentation signal transmission
It is particularly valued in process industries where long-distance signal transmission is required without signal degradation.
Recommended Related Modules
| Model | Function |
|---|---|
| 1771-OFE1 | Analog voltage output module |
| 1771-IFE | Analog input module |
| 1771-IFF | High-resolution analog input module |
| 1771-IXE | Thermocouple input module |
| 1771-IR | RTD input module |
| 1771-ASB | Remote I/O adapter |
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|---|---|
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