1771-IFEK Analog Input Module – PLC 5 Series
Allen-Bradley | Rockwell Automation | 1771-IFEK | 16-Channel Analog Input
This conformal-coated module protects against moisture and corrosion. It converts analog signals from sensors, transmitters, and field devices into digital data for the PLC-5 processor. The 1771-IFEK uses block transfer for configuration and data exchange. It fits a single 1771 I/O chassis slot and needs no external power supply.
Technical Specifications
| Brand | Allen‑Bradley / Rockwell Automation |
| Model | 1771‑IFEK |
| Series | PLC 5 |
| Module Type | Analog Input Module |
| Input Channels | 8 differential (selectable) or 16 single‑ended |
| Resolution | 12 bits + sign (BCD up to ±9999) |
| Update Time | 18 ms (8 ch) / 36 ms (16 ch) |
| Voltage Ranges | 0‑5V, 1‑5V, ±5V, ±10V, 0‑10V DC |
| Current Ranges | 4‑20mA, 0‑20mA, ±20mA |
| Backplane Current | 750 mA (5V DC) |
| External Power | Not required |
| Wiring Arm | 1771‑WG (field wiring) |
| Coating | Conformal (humidity & corrosion protection) |
| Power Dissipation | 2.5 W (max) / 8.52 BTU/hr thermal |
| LED Indicators | Green RUN, Red FAULT |
Key Features & Performance
- Input flexibility: 5 voltage and 3 current ranges.
- Data formats: Natural binary or BCD scaling to ±9999.
- Noise rejection: Optoelectrical isolation and digital filtering.
- Real‑time sampling: Selectable per channel.
- Keying bands: Pins 10‑12 and 24‑26 for module identification.
- Signal delay: 20‑24 ms (DC/AC) typical.
Installation & Mounting
- Chassis: Single slot in 1771 I/O rack.
- Wiring: 1771‑WG arm allows 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.
- Connects to indicators, solenoids, AC motor starters.
- 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.
- Update time per channel ensures timely data.
- Digital filtering reduces electrical noise impact.
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‑IFEK 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
- Process monitoring (pressure, temperature, flow).
- Analog signal acquisition from field transmitters.
- Legacy PLC‑5 systems with analog I/O needs.
- Industrial automation retrofits.
Oiltech Controls’s Insight
This module is a reliable choice for PLC‑5 analog input expansion. The conformal coating makes it suitable for humid or chemically aggressive environments. We recommend verifying keying bands and wiring arm compatibility before installation.
FAQ – Expert Selection Guide
Q: What is the difference between differential and single‑ended wiring?
Differential uses two wires per signal and rejects common‑mode noise better. Single‑ended uses one wire per signal and is simpler for short distances.
Q: How do I choose the right input range?
Match the range to your sensor output. For 4‑20mA transmitters, use 4‑20mA range. For voltage sensors, select the closest range to avoid clipping.
Q: Can I mix voltage and current inputs on one module?
Yes, each channel is independently configurable for voltage or current.
Q: What does the conformal coating protect against?
It resists moisture, dust, and mild chemical exposure – ideal for washdown areas or high‑humidity plants.
Q: How do I know if the module is working?
Check the green RUN LED. If red FAULT lights, verify keying, wiring, and configuration words.
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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