The Allen Bradley 1771-IFF is a PLC-5 series high-resolution analog input module designed for the 1771 I/O chassis platform. It is engineered for demanding process automation environments where precise measurement of voltage and current signals is required with improved accuracy and stability compared to standard analog input modules.
This module is commonly used in industrial systems that require fine-grain monitoring of process variables such as pressure, flow, temperature, and level.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Catalog Number | 1771-IFF |
| Module Type | High-Resolution Analog Input Module |
| System Family | PLC-5 / 1771 I/O |
| Input Channels | 8 differential / configurable |
| Input Signal Types | Voltage & Current |
| Voltage Range | ±10 VDC (typical ranges include 0–5V, 1–5V, ±10V) |
| Current Range | 4–20 mA / 0–20 mA |
| Resolution | 16-bit high resolution |
| Accuracy | ±0.05% full scale (typical) |
| Conversion Time | ~8–16 ms per channel |
| Backplane Current Draw | ~800 mA @ 5 V DC |
| Input Filtering | Digital filtering with noise rejection |
| Isolation | Channel-to-channel and system isolation |
| Data Format | Scaled engineering units / binary |
| Wiring Arm | 1771-WG |
| Mounting Type | 1771 chassis slot (1-slot width) |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Weight | ~0.5 kg |
| Dimensions (L×W×H) | 203 mm × 76 mm × 127 mm |
System Role Overview
The 1771-IFF module is designed for high-precision analog signal acquisition in PLC-5 systems. It provides improved resolution and stability for applications requiring accurate process monitoring.
Core functions include:
- High-resolution analog signal conversion (A/D)
- Precision measurement of process variables
- Advanced noise filtering for industrial environments
- Support for critical control loops
- Integration with PLC-5 block transfer communication
It is often selected in applications where standard analog modules are not sufficient for measurement accuracy requirements.
Recommended Related Modules
| Model | Function |
|---|---|
| 1771-IFE | Standard analog input module |
| 1771-IBD | DC digital input module |
| 1771-IBN | High-density DC input module |
| 1771-OBD | Digital output module |
| 1771-OWNA | Relay output module |
| 1771-ASB | Remote I/O adapter |
Common PLC-5 System Modules
| Model | Role |
|---|---|
| 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 |
