Product Overview
The Allen-Bradley 1762-IQ8 is a MicroLogix 1200 discrete input module designed for cost-effective expansion of MicroLogix controllers. With eight input channels in a single isolated group, this module accepts a nominal input voltage of 24VDC and supports both sink and source wiring configurations, reducing installation complexity and inventory costs. By enabling direct connection of field devices without additional adapters, it minimizes per-point cost while maintaining reliable signal acquisition.
Technical Specifications Breakdown
Key parameters for the 1762-IQ8 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation |
| Module Type | Discrete input module |
| Number of Inputs | Eight (8) channels |
| Number of Groups | One (1) isolated groups |
| Nominal Input Voltage | 24VDC |
| Input Voltage Range | 10-30 VDC |
| ON-state Current, min. | 2.0 mA min. at 10VDC; 8.0 mA nominal at 24VDC; 12.0 mA max. at 30VDC |
| Off-state Current, max. | 1.5 mA |
| Signal Delay, ON transition | 8 ms |
| Backplane Current, 5.1VDC | 50 mA |
| Backplane Current, 24VDC | 0 mA |
| Heat Dissipation | 3.7 Watts |
| Inputs | (8) Sink and Source |
Industry Applications
This module is ideal for high-density discrete sensing in packaging lines, material handling, and assembly stations. The 8 ms signal delay ensures fast response for cycle-time-sensitive processes, reducing machine downtime and improving throughput. By using a single module for both sink and source devices, you eliminate the need for separate I/O types, lowering spare parts inventory and training costs.
Installation & Setup Guidance
Mount the 1762-IQ8 on a DIN rail or directly on a panel. Ensure the module is installed in a non-hazardous, dry, and clean environment with circuits not exceeding Over Voltage Category II. Use the 1762 bus interface for communication and power. The input terminal blocks feature a finger-safe cover for operator protection. Configure each channel after installation via the host controller software.
Maintenance & Reliability
Periodically inspect the module for signs of dust accumulation or moisture. The 3.7 W heat dissipation requires adequate ventilation; maintain clearance as per the controller manual. The isolation rating of 1200V ac for 1 sec. or 1697V dc for 1 sec. (75V dc working voltage, IEC Class 2 reinforced insulation) protects against ground loops, reducing repair costs.
Compatibility & Integration
The 1762-IQ8 is compatible with MicroLogix 1100, 1200, 1400, and 1500 controllers. The number of supported modules depends on the host controller's hardware limits. This backward compatibility allows you to reuse the module across multiple machine generations, extending asset life.
Selection Guide & Purchasing Advice
For cost-sensitive projects, the 1762-IQ8 offers a low per-channel cost with flexible wiring. Verify current lifecycle status and availability with SpareTechPLC before ordering. SpareTechPLC stocks this module and can advise on compatible controllers and volume discounts.
Troubleshooting & Common Issues
If inputs do not respond, check the wiring polarity and ensure the field device supplies the correct ON-state current (minimum 2.0 mA at 10VDC). Verify the backplane current draw does not exceed the controller's capacity. The single status LED indicates power status; if off, check the 1762 bus connection and backplane power.
