Allen-Bradley 1746-IV32 SLC 500 Input Module Overview

The Allen-Bradley 1746-IV32 is an SLC 500 discrete input module. This module features thirty-two (32) input channels arranged in four (4) groups of eight channels each. It is a 24 VDC sourcing input module, meaning the module detects when field devices supply voltage to the inputs. The 1746-IV32 installs directly into any SLC 500 chassis as a single-slot module. Therefore, it works with any SLC 500 processor in local, extended, or distributed I/O racks.

Input Voltage & Current Specifications

The Allen-Bradley 1746-IV32 operates over a wide voltage range. Input voltage range at 50°C is 15 to 30 VDC . At 60°C, the range narrows to 15 to 26.4 VDC . Minimum on-state voltage is 15.0 VDC for reliable detection. Maximum off-state voltage is 5.0 VDC to ensure proper OFF recognition. Maximum off-state current is 1.5 mA . Nominal input current is 5.1 mA at 24 VDC . Consequently, the 1746-IV32 provides consistent performance across varying field conditions.

Timing & Performance Specifications

The Allen-Bradley 1746-IV32 offers predictable timing for control applications. Signal delay for ON transitions is 3 ms maximum . Signal delay for OFF transitions is 8 ms maximum . Therefore, the module responds quickly to input state changes. Heat dissipation per point is 0.20 W , with total module heat dissipation of 6.65 W . Backplane current consumption is 0.050 A (50 mA) at 5 VDC . There is no backplane current draw at 24 VDC. Channel isolation from the backplane is 1500 V AC for 1 minute .

Group Fusing & Series Differences

The Allen-Bradley 1746-IV32 has group fusing that varies by series. Series A, B, and C modules include non-replaceable fuses per input common. Each of the four groups has its own integral fuse rated at 2.5A . Series D modules do not have internal group fusing. Therefore, when using Series D modules, external fusing must be provided. The 1746-IV32 uses an electronically-fused common design with 60-second 1500V AC tested isolation from the backplane.

Environmental & Certification Specifications

The Allen-Bradley 1746-IV32 operates reliably in demanding environments. Operating temperature range spans 0°C to +60°C (+32°F to +140°F) . Storage temperature extends from -40°C to +85°C (-40°F to +185°F) . Relative humidity tolerance reaches 5% to 95% without condensation . The module withstands vibration of 2.5G at 57-200 Hz with tested peak displacement of 0.015 inches. Operational shock tolerance is 30G . The 1746-IV32 meets NEMA standard ICS 2-230 noise immunity requirements.

Agency certifications include UL / C-UL listed Class I, Division 2, Groups A, B, C, D . Additionally, it is CE marked for all applicable directives and C-Tick marked for all applicable acts.

Key Features & Benefits

• 32 sourcing inputs – The 1746-IV32 provides high-density DC input monitoring.

• Four isolated groups – Eight channels per group with common isolation.

• Wide voltage range – Operates from 15 to 30 VDC for application flexibility.

• Fast response time – 3 ms ON delay for time-critical input detection.

• High noise immunity – Meets NEMA ICS 2-230 standards.

• Hazardous location approved – Class I, Division 2 certified.

Installation Guidelines

Follow these steps to install the Allen-Bradley 1746-IV32 correctly. First, power down the SLC 500 chassis completely. Second, select an available slot for the module in the rack. Third, align the 1746-IV32 with the card guides in the chassis. Fourth, push the module firmly into the backplane connector until fully seated. Fifth, secure the module with the retaining screws at top and bottom. Finally, wire field devices to the input terminals according to the sinking/sourcing configuration.

For Series A, B, and C modules, note that the internal fuses are non-replaceable. If a fuse blows, the entire module must be replaced. For Series D modules, provide external fusing for each input group. The 1746-IV32 may be installed in local I/O racks, extended racks, and distributed I/O racks.

Package Contents

Your shipment includes the following items:

• 1 x Allen-Bradley 1746-IV32 discrete sourcing input module

• 1 x Installation instructions manual

No terminal block or wiring is included with the 1746-IV32. Therefore, you must provide suitable field wiring and external fusing for Series D modules.

Frequently Asked Questions (FAQ)

1. What is the difference between sourcing and sinking inputs?
The Allen-Bradley 1746-IV32 is a sourcing input module. Therefore, the field device must supply voltage to the input terminal to turn it ON.

2. Are the internal fuses replaceable?
For Series A, B, and C of the 1746-IV32, the internal fuses are NOT replaceable. For Series D, there are no internal fuses, so external fusing is required.

3. Can I use this module with 24 VAC signals?
No. The 1746-IV32 is designed for DC signals only (15-30 VDC). For AC inputs, use other SLC 500 AC input modules.

4. What is the backplane current draw of the 1746-IV32?
The Allen-Bradley 1746-IV32 draws 0.050 A (50 mA) from the 5 VDC backplane. It draws 0 A from the 24 VDC backplane.

5. Is this module approved for hazardous locations?
Yes. The 1746-IV32 is UL/C-UL listed for Class I, Division 2, Groups A, B, C, D. Therefore, it is suitable for use in hazardous areas.

Why Choose the Allen-Bradley 1746-IV32?

This SLC 500 discrete input module delivers reliable monitoring for DC field devices. For starters, the Allen-Bradley 1746-IV32 provides 32 sourcing inputs in four isolated groups of eight channels each. The wide voltage range from 15 to 30 VDC accommodates various DC power systems. Fast ON delay of 3 ms suits time-critical applications. The module draws only 0.050 A from the 5 VDC backplane, placing a minimal load on the power supply. Channel isolation of 1500 V AC protects the backplane from field wiring faults. Operating temperature range from 0°C to 60°C and humidity tolerance of 5-95% without condensation ensure reliable performance. The 1746-IV32 withstands vibration of 2.5G and shock of 30G for rugged industrial environments. Hazardous location certification (Class I, Division 2) expands installation options. Most importantly, this module integrates seamlessly into any SLC 500 system.

Order the Allen-Bradley 1746-IV32 today for your discrete input needs. Specifically, this module is perfect for machine control, conveyor systems, packaging equipment, and other applications requiring high-density DC sourcing inputs in a SLC 500 platform.