Allen-Bradley 1771-IL Analog Input Module - 8 Isolated Channels

Product Overview

The Allen-Bradley 1771-IL is an isolated analog input module. It fits into any 1771 I/O chassis. This module has eight fully isolated differential input channels. These channels work with voltage and current signals. Supported voltage ranges include 1 to 5V, 0 to 5V, -5 to +5V, -10 to +10V, and 0 to 10V. Current ranges include 4 to 20mA, 0 to 20mA, and -20 to +20mA. The module converts analog signals to digital values. It uses 16-bit binary resolution over the full range. The module uses block transfer for data communication. It also includes auto-calibration, open circuit detection, and input overvoltage protection.

Application Scenarios

Use this module in industrial automation systems. It works with PLC5 programmable logic controllers. The isolated inputs protect against ground loops. Applications include process control, monitoring, and data acquisition. The module handles both unipolar and bipolar signals. Unipolar ranges convert to 0000 to +4095. Bipolar ranges convert to -4095 to +4095. Typical industries include manufacturing, oil and gas, and water treatment. The module works well in noisy environments due to isolation.

Technical Specifications

The 1771-IL has eight isolated differential inputs. Isolation voltage is 1000 volts. The module type is analog input. It is compatible with any 1771 chassis. Resolution is 16-bit binary over the full range. The scan rate is 50 milliseconds for eight channels. Backplane current draw is 1.3 amperes. Voltage accuracy is typical 0.01% of full scale at 25 degrees Celsius. Current accuracy is typical 0.06% of full scale at 25 degrees Celsius. Maximum voltage accuracy is 0.05%. Maximum current accuracy is 0.1%. The module does not require external power. Data format is natural binary or BCD scaling to +/-9999. Channel update time is 500 milliseconds for eight channels with 15 bits plus sign. The wiring arm model is 1771-WG. Slot width is one slot.

Installation & Maintenance Guide

Install the module in any available slot of a 1771 chassis. Ensure the chassis is powered off before insertion. Secure the module in place. Connect the wiring arm 1771-WG for field wiring. Select the correct signal range using configuration software. The module has auto-calibration and does not need manual adjustment. It provides open circuit detection and overvoltage protection. For maintenance, inspect the module periodically. Clean the module with a dry cloth. Check for loose connections or damage. Replace the module if any faults appear.

Packing List

The package includes one Allen-Bradley 1771-IL analog input module. It also includes the wiring arm 1771-WG. The module ships via FedEx, UPS, or DHL. Packing materials protect the module during transport. No additional accessories are included.