Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1769‑IF4 (Series A/B) |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Series | CompactLogix / MicroLogix 1500 |
| Module Type | Analog Input (Group Isolated) |
| Input Channels | 4 channels (differential or single‑ended) |
| Signal Ranges | Voltage: ±10V, 0–10V, 0–5V, 1–5V Current: 0–20 mA, 4–20 mA |
| Resolution | 14‑bit (unipolar) / 14‑bit + sign (bipolar) |
| Accuracy (25°C) | Voltage: ±0.2% FS; Current: ±0.35% FS |
| Update Rate | ~22.5 ms for all 4 channels |
| Isolation | 500 V AC (channel‑to‑system), not channel‑to‑channel |
| Power Supply | 120 mA @ 5V DC (backplane), 60 mA @ 24V DC (external) |
| Operating Temperature | 0 to 60 °C |
| Dimensions (H × W × D) | 118 × 35 × 87 mm |
Main Features and Advantages
Flexible Signal Conditioning: Each of the four channels can be independently configured in software (RSLogix 5000) for voltage or current input. This allows a single module to handle mixed signals—for example, two channels reading 4–20 mA pressure sensors and two channels reading 0–10 V temperature transmitters.External Power Switch (Series B+): Later series modules include a physical switch that allows you to source the 24V DC power for the analog circuits from an external Class 2 power supply instead of the backplane. This is critical for reducing noise and preventing ground loops in sensitive analog measurements.High Noise Immunity: Despite being non‑isolated between channels, the module employs delta‑sigma conversion and filtering, providing excellent normal‑mode rejection (>50 dB at 50/60 Hz). This makes it suitable for noisy industrial environments like motor control centers.
Application Field
The 1769‑IF4 is widely used in discrete and process automation where cost‑effective analog monitoring is needed:
- Process Monitoring: Tank level (via pressure transmitters), flow rate, and pump pressure (using 4–20 mA signals).
- Machine Automation: Analog sensor feedback for position or speed control (using 0–10V signals).
- HVAC & Building Management: Monitoring temperature and pressure in climate control systems.
Related Products
1769‑IF4I – The isolated version of this module (channel‑to‑channel isolation). Recommended for new installations or electrically noisy environments.1769‑IF8 – 8‑channel analog input module for systems requiring higher point density.1769‑IR6 – RTD input module for direct temperature measurement (when analog sensors are not used).1769‑L32E / 1769‑L35E – Example CompactLogix controllers that typically host this I/O module.
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