Allen-Bradley 1762-IQ8 Input Module | 8 Channels

Allen-Bradley 1762-IQ8 8-Channel Discrete Input Module

Product Introduction

The Allen‑Bradley 1762‑IQ8 expands the I/O capacity of your MicroLogix control system with eight dedicated discrete input points. This module works seamlessly with MicroLogix 1200 series controllers and is also compatible with the MicroLogix 1100, 1400, and 1500 platforms. It reads 24 VDC nominal signals from field devices such as limit switches, pushbuttons, and proximity sensors. The 1762‑IQ8 supports both sink and source field connections, giving you flexible wiring options for diverse applications. Its single isolated group simplifies installation while maintaining robust isolation from the backplane.

Key Technical Specifications

The 1762‑IQ8 input module operates within a wide voltage range of 10 to 30 VDC at 30°C and 10 to 26.4 VDC at 55°C. Its nominal input voltage is 24 VDC. For reliable on‑state detection, the module requires a minimum current of 2.0 mA at 10 VDC, with nominal current reaching 8.0 mA at 24 VDC and a maximum of 12.0 mA at 30 VDC. The off‑state current stays below 1.5 mA, ensuring clear distinction between logic states.

Specifically, the 1762‑IQ8 delivers a consistent signal delay of 8 ms for both OFF‑to‑ON and ON‑to‑OFF transitions. This predictable response time benefits high‑speed monitoring applications. Additionally, the module draws only 50 mA from the 5.1 VDC backplane and consumes zero current from the 24 VDC backplane, keeping overall system power low.

Isolation and Protection

The input group on the 1762‑IQ8 is verified with a dielectric test of 1200V AC for 1 second or 1697V DC for 1 second. It features a 75V DC working voltage with IEC Class 2 reinforced insulation. This robust isolation protects the controller and other modules from voltage spikes and ground loops, which is critical in industrial environments.

Sink and Source Wiring Flexibility

This discrete input module supports both sink and source wiring configurations. In a sinking field device, the current flows from the power supply through the load and into the input. Conversely, a sourcing field device provides current to the module’s input. The 1762‑IQ8 handles either arrangement, so you can connect it to a wide variety of sensors and switches without changing hardware.

Mechanical and Environmental Parameters

The 1762‑IQ8 measures a single‑slot width and fits directly into a MicroLogix expansion chassis. It supports standard DIN rail mounting or direct panel mounting for secure installation. For proper cooling and maintenance access, maintain a clearance of at least 50.8 mm (2 inches) on all sides of the module.

This module dissipates 3.7 Watts of heat, so ensure adequate airflow within the enclosure. It operates in non‑hazardous, dry, and clean environments and should never be used with circuits exceeding Over Voltage Category II. The operating temperature range is 0°C to 55°C (32°F to 131°F), with storage temperatures from -40°C to 85°C (-40°F to 185°F). Relative humidity should remain between 5% and 95% non‑condensing for reliable performance.

Installation Guidelines

When installing the 1762‑IQ8, first verify that the host controller supports the required number of expansion modules. Next, mount the unit on a standard 35 mm DIN rail or secure it directly to a panel using the built‑in mounting holes. After mechanical installation, connect the field wiring to the removable terminal block. The terminal block features a finger‑safe cover to protect against accidental contact.

For wiring, use bit positions 0 through 7 for the eight input terminals. Ensure that all field devices match the sink or source configuration you have chosen. Moreover, always route input wiring separately from AC power cables to minimize electrical noise. Finally, apply power to the system and check the single status LED. This LED illuminates when the module receives power and communicates correctly with the controller.

Compatibility and System Integration

The 1762‑IQ8 integrates directly with the MicroLogix 1200 controller and also works with MicroLogix 1100, 1400, and 1500 systems. The number of modules you can install depends on the specific controller model and its expansion capacity. For instance, the MicroLogix 1200 supports up to four expansion I/O modules, while the 1400 series allows even more. Therefore, check your controller’s user manual to confirm the maximum module count before planning your system layout.

Furthermore, this module communicates with the processor via the 1762 bus interface. It receives both power and data through this backplane connection, eliminating the need for separate external power wiring. The 0.25 Watt power consumption at 5.1 VDC keeps the total system energy budget low, which is especially beneficial in larger installations with many modules.

Packaging List

Your shipment of the 1762‑IQ8 includes the following items:

• One Allen‑Bradley 1762‑IQ8 discrete input module

• One removable terminal block with finger‑safe cover

• One user manual quick‑start guide

• Mounting screws for panel installation

Note that certification documents and warranty information are not included in this package.

Shipping Information

We ship all orders via FedEx, UPS, or DHL to ensure fast and reliable delivery. Every package is carefully packed to prevent electrostatic discharge and physical damage during transit. Please allow 1‑2 business days for order processing before shipment.

Frequently Asked Questions

Q1: Is the 1762-IQ8 compatible with the MicroLogix 1500 controller?
Yes, the 1762‑IQ8 works with MicroLogix 1100, 1200, 1400, and 1500 controllers, provided the host supports expansion I/O modules.

Q2: Can I mix sinking and sourcing field devices on the same 1762-IQ8 module?
Absolutely. The 1762‑IQ8 supports both sink and source wiring on a per‑channel basis, so you can connect different device types simultaneously.

Q3: What is the maximum cable length I can use with this input module?
For reliable signal integrity, keep field wiring under 300 meters (984 feet) for most sensors. However, always refer to your sensor’s datasheet for specific distance recommendations.

Q4: How do I know if the module is powered and working correctly?
The 1762‑IQ8 has a single green status LED. When lit steadily, it indicates that the module has power and is communicating with the controller.

Q5: Does the module require external 24 VDC power supply wiring?
No. The 1762‑IQ8 draws all necessary power from the 5.1 VDC backplane via the 1762 bus interface, so no separate 24 VDC power connection is needed for the module itself.