Allen-Bradley 1771-IFE Analog Input Module PLC-5

1771-IFE 16-Channel Analog Input by Allen-Bradley

Product Introduction

The Allen-Bradley 1771-IFE serves as a core analog input solution within the PLC5 controller family. This module bridges the gap between field sensors and the processor. It translates analog signals like temperature, pressure, or flow into digital values. The processor then uses these values for control decisions. Manufacturers rely on this module for its flexibility and robust design. Its compatibility with any 1771 I/O chassis makes it a practical choice for system upgrades or maintenance.

Key Technical Specifications

This module provides significant channel configuration options. You can choose between Sixteen (16) single-ended inputs or Eight (8) differential inputs. This flexibility allows you to match the module to your specific sensor wiring needs. Differential inputs are useful for reducing noise in demanding environments. Single-ended inputs are suitable for simpler installations.

The 1771-IFE supports a wide array of signal ranges. For voltage, it accepts 1-5V, 0-5V, -5 to +5V, -10 to +10V, and 0-10V DC. For current, it handles 4-20mA, 0-20mA, and -20 to +20mA signals. This variety ensures compatibility with most common industrial transducers. The module provides a 12-bit binary resolution, with 12 bits plus a sign bit for ranges that include both positive and negative values. Its accuracy is rated at 0.1% of full scale range @ 25°C.

Performance metrics are crucial for process control. The channel update time is 18 ms for 8 channels and 36 ms for 16 channels. The internal scan rate is 12.5 ms for 8 differential inputs without filtering. Adding digital filtering increases this time by 2.12 ms. For 16 single-ended inputs, the scan rate is 25 ms, plus 4.24 ms with filtering. This module uses a natural binary or BCD data format, scaling to +/-9999.

Mechanical and Environmental Parameters

The Allen-Bradley 1771-IFE is designed for rack mounting. It occupies a single slot in the chassis. The module draws 750 mA from the backplane. It does not require an external power supply. Its power dissipation is a maximum of 2.5 Watts, with a thermal dissipation of 8.52 BTU/hour. Therefore, it generates minimal heat within the cabinet. The front panel features a green RUN and a red FAULT LED. These indicators provide immediate visual status feedback. This module also includes optoelectrical isolation. This feature protects the system from harmful electrical transients and noise.

Installation Guidelines

Installing the 1771-IFE is a straightforward process. First, ensure the chassis is powered off. Next, align the module with the selected slot in the 1771 I/O chassis. Slide it in firmly until it seats correctly with the backplane. Then, secure it with the retaining screws.

Keying bands are essential for correct installation. Place them between pins 10 and 12 for the lower connector. For the upper connector, place them between pins 24 and 26. This prevents incorrect insertion. The module comes with a 1771-WG wiring arm. This accessory simplifies wiring changes. You can remove or replace the module without disconnecting field wiring. This feature significantly reduces downtime during maintenance.

Digital Filtering and Configuration

The 1771-IFE includes an input filtering feature. This function is crucial for reducing electrical noise. Noise can corrupt sensitive analog signals. The filter smooths out fluctuations, providing a more stable reading. Additionally, the module uses block transfer programming for communication. This method efficiently moves data between the module and the processor.

Configuration parameters further enhance its functionality. Real-time sampling regulates the sampling time. It helps to minimize signal fluctuations. You can also scale the input to engineering units. Scaling displays the converted data in meaningful values, like PSI or degrees Celsius. This eliminates manual calculations. The data format parameter lets you assign the conversion format to the received signal. Consequently, you can tailor the module's behavior to your application's exact needs.

Process Variable Measurement

This analog input module is a key tool for measuring process variables. It connects to sensors monitoring Pressure, Level, Flow, and Temperature. Moreover, it can measure Speed, Viscosity, Turbidity, and pH. Other applications include Vibration and Displacement monitoring. The module converts the sensor's received signal into a proportional four-digit BCD or twelve-bit binary value. This data then becomes available for the PLC's logic program. As a result, the system can react to changes in the process efficiently.

Packaging and Shipping

For shipping, all modules are carefully packaged. We use anti-static materials to protect sensitive electronics. The packaging provides adequate cushioning against physical shocks. However, the packaging list does not include certificates or warranties. We include the module and the necessary 1771-WG wiring arm. We ship globally using reliable couriers like FedEx, UPS, and DHL.

Packaging List

• Allen-Bradley 1771-IFE Analog Input Module (1 unit)

• 1771-WG Wiring Arm (1 unit)

• Installation Instructions (Printed Quick Guide)

Frequently Asked Questions (FAQ)

1. Can I mix single-ended and differential inputs on the same 1771-IFE module?
No, the entire module is configured as either 16 single-ended or 8 differential inputs. You must select the configuration that best suits your overall wiring plan.

2. What is the function of the 1771-WG wiring arm?
The 1771-WG wiring arm allows you to wire the field signals. Its key benefit is that you can remove the module for replacement without disconnecting these wires, saving time.

3. What does the red FAULT LED on the front panel indicate?
A red FAULT LED typically signals a hardware error, configuration mismatch, or a communication issue. You should check the module's configuration and chassis backplane connection.

4. Is external power required for the 1771-IFE to operate?
No, the module draws its operational power from the backplane of the 1771 I/O chassis. It does not require a separate external power supply.

5. How does digital filtering affect the module's performance?
Digital filtering helps to smooth out noise from the input signal. However, it adds a slight delay to the scan time. The delay is approximately 2.12 ms for 8 channels.