1771-IFF Analog Input Module – PLC 5 Series
Allen-Bradley | Rockwell Automation | 1771-IFF | 16-Channel Analog Input
This high-speed analog input module interfaces field devices with PLC-5 processors via block transfer. It offers 16 single-ended or 8 differential inputs with 12-bit resolution. The conformal coating protects against moisture and corrosion. It fits a single 1771 I/O chassis slot and needs no external power supply.
Technical Specifications
| Brand | Allen‑Bradley / Rockwell Automation |
| Model | 1771‑IFF |
| Series | PLC 5 |
| Module Type | Analog Input Module |
| Input Channels | 8 differential or 16 single‑ended (selectable) |
| Resolution | 12 bits + sign (BCD up to ±9999) |
| Update Time | 5 ms (8 ch) / 10 ms (16 ch) |
| Voltage Ranges | 0‑5V, 1‑5V, ±5V, ±10V DC |
| Current Ranges | 4‑20mA, 0‑20mA, ±20mA, ±40mA |
| Backplane Current | 750 mA (5V DC) |
| External Power | Not required |
| Wiring Arm | 1771‑WG (field wiring) |
| Coating | Conformal (moisture & corrosion protection) |
| Power Dissipation | 2.5 W (max) / 8.52 BTU/hr thermal |
| LED Indicators | Green RUN, Red FAULT |
Key Features & Performance
- Fast update: 5 ms for 8 channels, 10 ms for 16 channels.
- Input flexibility: 5 voltage and 4 current ranges.
- Data formats: Natural binary or BCD scaling to ±9999.
- Noise rejection: Optoelectrical isolation and input filtering.
- Fault response: Auto-default to safe user configuration on communication loss.
- Keying bands: Pins 10‑12 (lower) and 24‑26 (upper) for correct installation.
Installation & Mounting
- Chassis: Single slot in 1771 I/O rack.
- Wiring: 1771‑WG arm enables hot‑swap without disconnecting wires.
- Coating: Conformal film shields against humidity and contaminants.
- Power: Draws 750 mA from backplane (no external supply).
- Keying: Install bands between pins 10‑12 and 24‑26.
Compatibility & Integration
- Works with PLC‑5 processors via block transfer.
- Ideal for temperature, pressure, level, and flow sensors.
- Supports differential or single‑ended wiring.
- Data table mapping via configuration words.
Diagnostic & Field Support
- Green RUN LED confirms normal operation.
- Red FAULT LED indicates error or configuration issue.
- Fast update time ensures real‑time data acquisition.
- Input filtering reduces electrical noise impact.
- Auto‑fault response provides predictable safety.
Environmental & Certifications
- Operating temp: 0‑60°C.
- Humidity: 5‑95% non‑condensing.
- Coating meets industrial corrosion resistance.
- Certifications: UL, CSA (typical for PLC‑5).
Package Contents
- 1771‑IFF analog input module.
- 1771‑WG wiring arm.
- Keying bands (set).
- User manual (digital).
Warranty & Shipping
12‑month warranty against defects. 24‑28 hour dispatch from order confirmation. Shipping: FedEx, UPS, DHL – global express.
Typical Applications & Compatible Devices
- Temperature sensing (thermocouples, RTDs with transmitters).
- Pressure and level sensing (4‑20mA transducers).
- Flow metering (differential pressure or magnetic flowmeters).
- Legacy PLC‑5 systems requiring analog I/O expansion.
- Industrial automation retrofits and upgrades.
Oiltech Controls’s Insight
This module stands out for its fast 5 ms update time – ideal for dynamic process control. The ±40mA range is rare and useful for specialized transducers. We recommend verifying the wiring arm (1771-WG) and keying bands before installation to avoid downtime.
FAQ – Expert Selection Guide
Q: What is the advantage of differential over single‑ended wiring?
Differential inputs reject common‑mode noise better, making them suitable for long cable runs or noisy environments.
Q: How do I choose between 4‑20mA and 0‑20mA ranges?
Use 4‑20mA for live-zero sensors (detects broken wire). Use 0‑20mA for general current-loop devices.
Q: What does the ±40mA range support?
It handles specialized transducers with bipolar current output – common in some analytical instruments.
Q: Can I mix voltage and current inputs on one module?
Yes, each channel is independently configurable for voltage or current.
Q: What if I lose communication with the processor?
The module holds last valid values or defaults to user‑configured safe states – prevents unexpected outputs.
Why Buy From Oiltech Controls?
- Over 15 years in industrial automation spares.
- Global shipping with tracking.
- Tested surplus / refurbished options available.
- 12‑month warranty included.
- Pre‑shipment technical verification.
- Expert support for obsolete control systems.
Contact Inquiries: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp)
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