Product Overview

The Allen-Bradley 1794-IB32 belongs to the Flex I/O product family. This module provides thirty-two current sinking input channels. It connects field devices like pushbuttons, limit switches, and proximity sensors. The 1794-IB32 works with various Flex I/O communication adapters. These include Ethernet, ControlNet, and Remote I/O adapters. You can install multiple modules as long as system rules are followed.

Technical Specifications

The 1794-IB32 operates with a nominal signal level of 24V DC. Its on-state voltage ranges from 19.2V DC minimum to 31.2V DC maximum. The off-state voltage maximum is 5V DC.

Current ratings for the 1794-IB32:

• On-state current minimum: 2.0 mA

• On-state current maximum: 6.0 mA

• Nominal on-state current: 4.1 mA at 24V DC

• Off-state current maximum: 1.5 mA

• Nominal input impedance: 22.2 kΩ

Power and thermal data:

• FlexBus current: 30 mA at 5V DC

• Maximum power dissipation: 6.0 Watts at 31.2V DC

• Maximum thermal dissipation: 20.47 BTU/hour at 31.2V DC

• Isolation voltage: 50V continuous (system to field side)

Environmental limits:

• Operating temperature: 0 to 55 °C (32 to 131 °F)

• Storage temperature: -40 to 85 °C (-40 to 185 °F)

• Relative humidity: 5 to 95% non-condensing

• Vibration resistance: 5g at 10 to 500 Hz

• Operating shock: 30g

• Non-operating shock: 50g

Physical dimensions:

• Width: 94 mm (3.7 inches)

• Height: 94 mm (3.7 inches)

• Depth: 69 mm (2.7 inches)

• The 1794-IB32 has an open-style enclosure

LED Indicators and Diagnostics

The 1794-IB32 features 32 yellow status indicators. Each channel has its own dedicated LED. The LED turns ON when the input signal is present. It turns OFF when no signal is received. This design helps operators verify field device operation quickly. You can identify active channels without special tools.

Compatible Terminal Bases

The 1794-IB32 requires a Flex I/O terminal base for installation. The terminal base provides input and power connections. It also includes the DIN rail mounting slot. Compatible terminal bases for this high-density module are:

• 1794-TB32

• 1794-TB32S

• 1794-TB62DS

• 1794-TB62EXD4X15

These terminal bases support hot insertion. You can remove or insert the 1794-IB32 under power. This feature reduces system downtime during maintenance.

Keyswitch Setting

The 1794-IB32 uses keyswitch position 2. This mechanical keying prevents incorrect module installation. Always verify the keyswitch position matches the terminal base. Proper keying protects both the module and the base from damage.

Installation Guidelines

Install the 1794-IB32 onto a compatible terminal base first. Then snap the terminal base onto a standard DIN rail. Push the module firmly until the connector seats fully. Secure the module with the locking mechanism on the terminal base. Wire size depends on the terminal base you select. Refer to the terminal base manual for wire specifications.

Do not install the 1794-IB32 in dirty or humid environments. Keep the surrounding air temperature within 0 to 55 °C. Allow space around the module for proper cooling. The 1794-IB32 weighs approximately 0.31 kg.

Package Contents

• One Allen-Bradley 1794-IB32 Flex I/O DC Input Module

• One keyswitch position label (factory installed)

• Product information sheet

Frequently Asked Questions (FAQ)

1. How many input channels does the 1794-IB32 provide?
The 1794-IB32 provides thirty-two sinking DC input channels. Each channel has an individual LED indicator.

2. What is the minimum on-state voltage for this module?
The 1794-IB32 requires at least 19.2V DC to recognize an ON state. The maximum ON voltage is 31.2V DC.

3. Can I remove the 1794-IB32 while power is applied?
Yes, the 1794-IB32 supports removal under power. You must use a compatible terminal base like the 1794-TB32S.

4. What type of field devices work with the 1794-IB32?
The 1794-IB32 works with pushbuttons, limit switches, proximity sensors, and relay contacts. All devices must provide sinking DC signals.

5. Does the 1794-IB32 have channel-to-channel isolation?
No, the 1794-IB32 does not isolate individual channels. It provides 50V isolation between the system and field side only.