Product Overview
The Allen-Bradley 1771-IFEK is a high-performance analog input module designed for the PLC-5 family. It reliably captures analog signals from sensors and transmitters, converting them into digital values for your control system. This module is built to withstand harsh industrial environments, thanks to its conformal coating that guards against moisture and corrosion.
Key Features & Benefits
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Flexible Input Configuration: Supports 8 differential or 16 single-ended inputs, allowing you to adapt to various wiring schemes.
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No External Power Needed: The 1771-IFEK draws power directly from the backplane, simplifying installation and reducing wiring complexity.
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Multiple Ranges: Selectable voltage and current ranges (0-5V dc, 1-5V dc, ±5V dc, ±10V dc; 4-20mA, 0-20mA, ±20mA) to match your sensors.
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High Resolution: 12-bit resolution plus sign provides accurate measurement for precise control.
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Fast Update: 18 ms per 8 channels and 36 ms per 16 channels ensures responsive data acquisition.
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Rugged Design: Conformal coated for protection against humidity and contaminants, ideal for demanding applications.
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Diagnostic LEDs: Front-panel RUN and FAULT indicators help with quick status checks.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1771-IFEK |
| Module Type |
Analog Input |
| Inputs/Outputs |
8 Differential Selectable or 16 Single-Ended Selectable |
| Data Format |
Natural Binary or BCD Scaling to ±9999 |
| Channel Update/Resolution |
18 ms/8 channels; 36 ms/16 channels; 12 bits + sign |
| Voltage Range |
0-5 V dc, 1-5 V dc, ±5 V dc, ±10 V dc |
| Current Range |
4-20 mA, 0-20 mA, ±20 mA |
| Backplane Current |
750 Miliamperes |
| External Power Required |
No |
| Wiring Arm |
1771-WG |
| Coating |
Conformal Coat |
| Typical AC Signal Delay (Off) |
24 (±10) ms |
| Typical DC Signal Delay (Off) |
20 (±9) ms |
| Mounting |
Rack Mountable |
Applications
The 1771-IFEK is versatile and suits a wide range of industrial automation tasks. Use it with indicators, solenoids, and AC motor starters. Its flexible input ranges make it ideal for monitoring process variables like temperature, pressure, and flow. For example, in a packaging line, you can connect analog sensors to the module to ensure precise filling levels. In a water treatment plant, it can monitor tank levels and chemical dosages, providing reliable data for control logic.
Installation & Setup
Mount the 1771-IFEK in a single slot of a 1771 I/O chassis. Connect field wiring using the 1771-WG wiring arm, which allows you to replace the module without disconnecting wires. The module operates without an external power supply, drawing backplane current of 750 mA. Ensure proper keying bands are placed between pins 10-12 and 24-26 to prevent incorrect module insertion. Configure the input ranges and data format via block transfer programming to match your application needs.
Maintenance & Reliability
The conformal coating protects the module from moisture and corrosion, extending its service life. Regularly inspect the module and wiring for signs of wear or damage. Because the module has no moving parts, maintenance is minimal. The front-panel LEDs help you quickly identify operational status. With proper care, the 1771-IFEK delivers reliable performance for years, reducing downtime and total cost of ownership.
Selection Guide
When selecting the 1771-IFEK, verify that your system uses a PLC-5 processor and has an available slot. Ensure the backplane can supply 750 mA. The module supports both voltage and current inputs, so choose the appropriate range for your sensors. For replacements or new installations, PLC Source PRO offers genuine Allen-Bradley 1771-IFEK modules with fast shipping and competitive pricing.