Allen-Bradley | 1794-IB32 FLEX I/O Sinking Digital Input Module

Overview

The Allen-Bradley 1794-IB32 is a 32-point DC sinking digital input module designed for the FLEX I/O system. It provides high-density input capability in compact form, allowing reliable digital signal acquisition in distributed control architectures. With LED indication, field-side isolation, and flexible mounting options, this module delivers performance suited for industrial automation and process control systems.

Technical Specifications

• Manufacturer: Allen-Bradley

• Product Line: FLEX I/O Series

• Model / Part Number: 1794-IB32

• Product Type: Digital Input Module

• Number of Inputs: 32 sinking-type channels

• Nominal Input Voltage: 24V DC

• Nominal Input Impedance: 22.2 kΩ

• Input Type: Current, sinking

• Isolation Voltage: 50V continuous, basic insulation

• Type tested at 2121V DC for 2 seconds between field and system

• No isolation between individual channels

• FlexBus Current Draw: 25 mA @ 5V DC

• Power Dissipation (Max): 6.0 W @ 31.2V DC

• Thermal Dissipation (Max): 20.47 BTU/hr @ 31.2V DC

• Recommended Terminal Base Units: 1794-TB32, 1794-TB32S, 1794-TB62DS, 1794-TB62EXD4X15

• Indicators: 32 yellow LEDs (status for each input channel)

• External Power Supply: 24V DC nominal

• Mounting Type: DIN Rail

• Dimensions (L x W x H): 6.9 cm × 9.4 cm × 9.4 cm

• Weight: 2 kg

• Terminal Base Screw Torque: Determined by terminal base used

Key Features

• High-density 32-point sinking digital input module for FLEX I/O systems

• Compact, modular design ideal for distributed automation networks

• Integrated per-channel status indication simplifies system diagnostics

• 24V DC nominal operation for standard industrial environments

• Compatible with multiple FLEX terminal base options for flexible wiring

Application Scenarios

• Distributed I/O applications in process and factory automation

• High-channel-count machine control systems requiring compact input modules

• Integration with Allen-Bradley ControlLogix, CompactLogix, or PLC-5 systems

• Real-time signal monitoring for sensors, switches, and limit detectors

FAQs

Q: What is the difference between sourcing and sinking inputs?
A: Sinking inputs connect to devices that source current (PNP-type sensors), allowing current to flow into the module input terminal.

Q: Can I use the 1794-IB32 with a CompactLogix controller?
A: Yes, the module integrates seamlessly with CompactLogix and ControlLogix systems via an adapter.

Q: What is the recommended operating voltage?
A: The module operates at a nominal 24V DC with acceptable variation from 10V to 31.2V DC.