Product Overview

The 1771-IBN is a discrete input module from Allen-Bradley. It belongs to the bulletin 1771 product family. This module provides 32 input channels. Each channel accepts 10-30VDC signals. The module interfaces with switches and sensors. It uses a 1771-WN wiring arm. The front panel has 32 LED indicators. These LEDs show the status of each channel. The module has input filtering to reduce noise. It also includes optoelectrical isolation for system protection. This module fits in 1771 I/O chassis. Examples include the 1771-A1B through 1771-A4B. It supports 1/2 and 1-slot addressing. The backplane current draw is 280mA at 5VDC. Maximum power dissipation is 16.4 Watts.

Application Scenarios

Use the 1771-IBN in industrial control systems. It works with PLC-5 processors. Connect dry-contact switches to the inputs. It also works with electro-mechanical transmitters. Use it with selector switches and pushbuttons. The module handles source-switching devices. It is ideal for factory automation. It also suits process control applications. The 32 channels allow many signals in one module. This saves space in the control panel. The wiring arm simplifies field wiring changes. You can replace the module without rewiring.

Technical Specifications

Input Characteristics

Number of inputs: 32 (4 sets of 8). Voltage range: 10 to 30VDC. On-state voltage minimum: 10VDC. Off-state voltage maximum: 5VDC. Max off-state current: 1.7mA. Typical signal delay On: 6ms (±2ms). Typical signal delay Off: 6ms (±2ms). Nominal input current: 4.7mA at 10VDC, 15.6mA at 30VDC.

Electrical

Backplane current: 280mA at 5VDC. Power dissipation: 16.4W maximum. Thermal dissipation: 53.3 BTU/hr maximum, 5.1 BTU/hr minimum. Voltage category: 10-60VDC sink (source load).

Physical

Dimensions: 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm). Coating: conformal coat. Enclosure: open type. Wiring arm: 1771-WN included. Wire size: 22 to 14 AWG solid or stranded. Insulation rating: 75°C or greater. Wiring arm screw torque: 1.0 N-m.

Installation & Maintenance Guide

Install the module in a 1771 chassis. Use keying bands between pins 18 and 20 for the upper connector. Use keying bands between pins 14 and 16 for the lower connector. Connect field wiring to the 1771-WN wiring arm. Ensure power is off before installation. The module supports hot swapping with the wiring arm. Check LED indicators for troubleshooting. Replace module only with matched wiring arm. Store in a dry environment. Clean with a soft cloth only.

Packing List

Each package contains one 1771-IBN module. It also includes one 1771-WN wiring arm. The module comes with installation instructions. No extra accessories are included. Shipping options are FedEx, UPS, or DHL.