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AB Analog Input Module Cat. No. 1771-IFE

From: | Author:Wang | Time :2025-04-21 | 39 visit: | Share:

AB Analog Input Module Cat. No. 1771-IFE

Module Overview: The 1771-IFE Analogue Input Module is an intelligent block transfer module that interfaces with block transfer capable 

Allen-Bradley programmable controllers to enable data interaction between analogue input signals and the controller. 

It is a single-slot module that requires no external power supply (passive sensors require user-supplied loop power) and is capable of processing 

16 single-ended or 8 differential analogue inputs and converting them to a specified data format for transmission to the processor.


Installation Procedure:

Pre-installation Preparation: Before installation, calculate the power requirements of all modules in the chassis to avoid overload, 

determine the location of the modules in the I/O chassis (any slot except the leftmost slot), and key the backplane connectors.

Static protection: Wear an anti-static wrist strap or touch a grounded object during operation, avoid touching the backplane connector pins, 

and place the module in a static-shielding bag when not in use.

Wiring operation: Connect the 1771-WG wiring arm, single-ended inputs and differential inputs have different connection methods, 

and the analogue input signal should be within ±14.25V, unused channels should be shorted to the common terminal of the module. 

The module defaults to a 1 - 5V DC voltage input, which can be changed via the configuration plug.


Programming points:

Block Transfer Programming: The module communicates with the processor via a bi-directional block transfer, the block transfer write command is used 

to initialise the configuration, the rest of the time it is mainly in block transfer read mode.

Examples of programming for different processors: PLC-2 is programmed with the note that read and write instructions cannot be enabled at the same time; 

PLC-3 uses a binary file for storing module related data; PLC-5 uses a separate control file and is conditional on an enable bit.

Scan Time: The scan time refers to the time it takes for the module to read the input channels and put the new data into the data buffer, 

which is related to the module configuration, e.g. 12.5ms for 8 differential inputs without filtering, 25ms for 16 single-ended inputs without filtering.


Module Configuration:

Input Range Selection: 5 types of voltage or 3 types of current input ranges can be configured, set by the specified word of the Block Transfer Write command.

Other Configuration Options: Includes selection of input type (single-ended or differential), data format (BCD or binary, etc.), digital filtering, 

real-time sampling and scaling, and other functions.


Data Reading and Diagnostics:

Data reading: Transfer module status and data to processor data table through block transfer read programming, data contains diagnostic bits, 

input values and other information.

Troubleshooting: The module reports faults through indicators and status bits, e.g., the red FAULT indicator lights up to indicate a fault, 

and the type of fault can be determined according to the diagnostic bits.


Calibration operation:

CALIBRATION TOOLS: Calibration requires a digital voltmeter (e.g., Keithley 191 or Fluke 8300A), a calibration tool (p/n 35F616), 

potentiometer sealant, industrial terminals (1770 - T3, etc.), and a backplane expansion card (1771 - EZ).

Calibration procedure: Adjust the 10V reference voltage, then zero the input offset. 

The module must be powered on for 30 minutes before calibration and cannot be calibrated in the operating system.

Technical specifications: The module has various technical specifications, such as input voltage ranges from +1 to +5V dc, current ranges 

from +4 to +20mA, 12-bit binary resolution, 0.1% of full scale range @ 25 °C, and so on.


Key Issues:

What are the key things to keep in mind when installing 1771-IFE modules?

Answer: Installation requires calculating the power requirements of all modules in the box to avoid overloading; select a location other than 

the leftmost slot for installation; key the backplane connector; protect against static electricity and avoid touching the backplane connector pins; 

when connecting the 1771-WG wiring arm, pay attention to the connection of single-ended and differential inputs to ensure that 

the analogue input signals are in the range of ±14.25V, and that unused channels are shorted to the module common; 

the module's default 1 - 5V DC voltage inputs can be configured as required. Unused channels are shorted to the common of the module; 

the module defaults to a 1 - 5V DC voltage input, which can be changed as required by configuring the plug.


How is the module programmed differently on different processors?

Answer: In PLC-2 programming, it is important to note that read/write commands cannot be enabled at the same time, 

and specific memory bits are used to control the block transfer order; PLC-3 uses a binary file to store module related data, 

and the industrial terminal will prompt for the creation of a control file; and PLC-5 uses a separate control file, 

and conditions each rung with an enable bit rather than a completion bit.


How do I calibrate the 1771-IFE module?

Answer: Calibration requires a digital voltmeter, calibration tool, potentiometer sealant, industrial terminal and backplane expansion card. 

First, adjust the 10V reference voltage, turn off the power of the processor and I/O chassis, insert the module into the expansion card and then into the chassis, 

connect the voltmeter and then adjust potentiometer R64 to make the TP1 voltage 10.0000V (±.0002V max.); then, zero the input offset, 

turn off the power, move jumper E1, connect the voltmeter, turn on the power and adjust potentiometer R63 to make the TP2 voltage 0.0000V (±.0002V max.). 

0.0000V (±0.0002V max.), then remove the power supply and restore jumper E1 to its default position.


Application Scenarios

Industrial automation production: In the manufacturing production line, it can be connected to a variety of devices such as temperature sensors, 

pressure sensors, flow sensors, etc. to collect analogue signals in the production process. 

Take an automobile manufacturing plant as an example, in the painting workshop, the module collects temperature and humidity sensor signals, 

which are converted and transmitted to the programmable controller, which accurately regulates the painting environment to ensure stable coating quality; 

in the assembly workshop, it monitors the pressure and position sensor signals of the robotic arm to ensure the accuracy of parts assembly 

and the safety of the equipment, and to improve the production efficiency and quality of the products.

Process control system: Suitable for chemical, electric power, metallurgy and other process control scenarios. 

In chemical production, connect flow, pressure, temperature, composition analysis and other sensors to collect real-time analogue signals 

of process parameters in the reactor. The module converts the signals into digital format and transmits them to the controller, 

which adjusts valve openings, pump speeds and other actuators according to preset parameters and algorithms to realise automated control 

of the production process, ensure a stable and efficient production process, reduce production costs and reduce human errors.

Environmental monitoring and control system: play an important role in intelligent buildings, environmental monitoring systems. 

In intelligent buildings, temperature and humidity sensors, light sensors, air quality sensors, etc. 

are connected to collect analogue signals of indoor environment and transmit them to the central control system. 

The system automatically adjusts air conditioning, ventilation, lighting and other equipment based on the data to create a comfortable, 

energy-efficient indoor environment. In the field of environmental protection monitoring, it is used to collect analogue signals such 

as air pollutant concentration and water quality parameters to achieve real-time monitoring and early warning of environmental quality 

and provide data basis for environmental protection decision-making.

Testing and experimental equipment: in all kinds of test benches and experimental equipment, it is used to collect analogue data in the experimental process. 

In electronic equipment testing, connecting voltage, current, power and other sensors, real-time monitoring of electrical parameters 

in the testing process, to provide data support for product performance evaluation and quality testing. 

In scientific research experiments, it collects analogue signals of various physical and chemical quantities to help researchers accurately record 

and analyse experimental data and promote the progress of scientific research.

Allen-Bradley 1771-IFE/C Analog Input Module for sale online | eBay


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