Allen-Bradley 1762-IQ32T MicroLogix 1200/1400 32-Point 24V DC Sink/Source Digital Input Expansion Module

Product Overview

The Allen-Bradley 1762-IQ32T is a high-density 32-point, 24 V DC digital input expansion module that belongs to the Rockwell Automation 1762 MicroLogix I/O family, purpose-built for use with MicroLogix 1100, 1200, and 1400 programmable logic controllers. Designed to extend the discrete signal acquisition capability of compact PLC systems, the Allen-Bradley 1762-IQ32T provides thirty-two individually monitored DC input points organized into four electrically isolated groups of eight channels each, allowing flexible wiring of multiple field-device power commons within a single compact module. Each input channel of the Allen-Bradley 1762-IQ32T is sink/source (NPN/PNP) selectable by external wiring, eliminating the need to stock separate sinking and sourcing modules and simplifying integration with mixed sensor types such as PNP proximity switches and NPN photoelectric eyes.The Allen-Bradley 1762-IQ32T operates over a 10–30 V DC input voltage range (24 V DC nominal) with an 8 ms input filter delay on both turn-on and turn-off transitions, providing noise immunity suitable for typical industrial machine environments. The module draws its logic power from the MicroLogix backplane (max 170 mA @ 5 V DC) while the field-side input circuits require an external 24 V DC supply connected through the terminal block commons. Input status is indicated by individual point LEDs and a module OK indicator for rapid troubleshooting. With reinforced IEC Class 2 insulation between input groups and the backplane (tested at 1200 V AC / 1697 V DC), Class I Division 2 hazardous location approvals, and robust EMC immunity (ESD, EFT, surge per IEC 61000-4-x), the Allen-Bradley 1762-IQ32T delivers reliable performance in packaging machinery, material handling systems, assembly stations, and other space-constrained automation applications where maximizing I/O density without sacrificing diagnostic visibility is essential.

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Description

Technical Specifications

Product Model | 1762-IQ32TManufacturer | Allen-Bradley / Rockwell AutomationProduct Type | MicroLogix 1200/1400 Series 24 V DC Digital Input Expansion ModuleNumber of Inputs | 32 points (4 isolated groups × 8 points)Input Voltage Category | 24 V DC (operating range 10…30 V DC @ ≤ 30 °C; 10…26.4 V DC @ 60 °C)Input Type | Sink/Source (NPN/PNP) selectable via wiringOn-State Voltage (min) | 10 V DCOff-State Voltage (max) | 5 V DCInput Impedance | 4.7 kΩ nominalOn-State Current | 1.6 mA @ 10 V DC (min); 6.5 mA @ 30 V DC (max)Signal Delay (On / Off) | 8.0 ms typical (hardware filter)Backplane Bus Current Draw | 170 mA max @ 5 V DC; 0 mA @ 24 V DCHeat Dissipation | 5.4 – 6.8 W max @ 30 V DCIsolation (Input Group to Backplane) | 1200 V AC for 2 s or 1697 V DC for 2 s; 75 V DC working (IEC Class 2 reinforced)Terminal Type | Removable screw clamp terminal blockPower Supply Distance Rating | Max 6 modules from system power supply in rackOperating Temperature | -20 … +60 °C (-4 … +140 °F)Storage Temperature | -40 … +85 °CHumidity (non-condensing) | 5 % – 95 % RHDimensions (H × W × D) | 90 mm × 40.4 mm × 87 mm (3.54″ × 1.59″ × 3.43″)Weight | Approx. 200 g (0.44 lb)Mounting | 35 mm DIN rail or panel mountEnclosure Rating | IP20 (for installation inside control cabinet)Certifications | UL listed, cUL, CE marked, Class I Div 2 Groups A–D, RoHS compliant

Main Features and Advantages

Sink/source flexibility: The Allen-Bradley 1762-IQ32T can be wired as either a sinking (NPN) or sourcing (PNP) input module simply by connecting the group common terminals to 0 V DC or +24 V DC respectively. This universal compatibility lets OEMs standardize on one part number regardless of whether the field devices are PNP 3-wire sensors or NPN open-collector switches, reducing spare parts inventory and simplifying bill-of-materials management.High-density four-group isolation: Packing 32 inputs into a module only 40.4 mm wide, the Allen-Bradley 1762-IQ32T offers exceptional I/O-per-rack-space efficiency—ideal when cabinet real estate is limited. The four independent commons (Inputs 0–7, 8–15, 16–23, 24–31) provide electrical isolation between groups, so different machine zones or safety-related sections can be powered from separate 24 V DC supplies, containing ground faults and easing troubleshooting.Industrial-grade noise immunity and safety: Each input channel on the Allen-Bradley 1762-IQ32T incorporates an 8 ms hardware filter to reject contact bounce and electrical noise from relays, solenoids, and variable-frequency drives. The module passes rigorous EMC tests including ±4 kV ESD contact/air discharge, ±2 kV EFT/B on signal ports, and ±2 kV common-mode surge. Reinforced insulation between field inputs and the 5 V backplane logic protects the controller from accidental high-voltage transients on the input side.Easy diagnostics and installation: Front-panel LEDs give instant visual confirmation—a green “OK” light shows module communications health, while individual green LEDs on each of the 32 input points indicate active high-state signals. The detachable screw-terminal block with finger-safe cover allows pre-wiring and quick module replacement without disturbing field wires. The Allen-Bradley 1762-IQ32T snaps onto standard 35 mm DIN rail and auto-enumerates in RSLogix/Studio 5000 Micro programming software, requiring no DIP-switch configuration.