Why the 1762-IR4 Belongs in Your MicroLogix Panel
Temperature drift, noisy RTD signals, and a stalled production line—these are the problems the Allen-Bradley 1762-IR4 is built to solve. As a four-channel RTD and resistance input module for the MicroLogix 1100, 1200, and 1400 controllers, it turns raw resistance from temperature sensors into clean, usable data your PLC can act on. When you need spares without the wait, Oil AutoTech keeps fast-dispatch stock ready for oil, gas, and industrial automation teams.
What the 1762-IR4 Actually Does
The 1762-IR4 is an analog input module that interfaces Resistance Temperature Detectors and resistance-generating devices. It uses Delta-Sigma conversion to translate resistance into digital values, then stores them in registers your controller can read. Each of the four channels works independently, so you can mix sensor types across one module. The unit also performs both module and channel diagnostics, and a single diagnostic LED shows status and power to help you find faults quickly.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Product Family | MicroLogix |
| Inputs | Four (4) |
| Converter Type | Sigma-Delta |
| Heat Dissipation | 1.5 Watts |
| Compatible Controllers | MicroLogix 1100 / 1200 / 1400 |
| Compatible Resistance Signals | 0 to 150 Ohm, 0 to 500 Ohm, 0 to 1000 Ohm, 0 to 3000 Ohm |
| Input Filters | 10 Hz, 50 Hz, 60 Hz, 250 Hz, 500 Hz, 1 kHz |
| Data Formats | raw/proportional, engineering units x 1, engineering units x 10, scaled-for-PID, percent full scale |
| Dimensions | 90 x 87 x 40 mm |
| Mounting | DIN rail or panel mount |
RTD Compatibility That Covers Real Plants
The 1762-IR4 accepts a wide range of RTD types: 100 Ohm Platinum 385, 200 Ohm Platinum 385, 500 Ohm Platinum 385, 1000 Ohm Platinum 385, 100 Ohm Platinum 3916, 200 Ohm Platinum 3916, 500 Ohm Platinum 3916, 1000 Ohm Platinum 3916, 10 Ohm Copper 426, 120 Ohm Nickel 672, 120 Ohm Nickel 618, and 604 Ohm Nickel-Iron 518. It supports 2-wire, 3-wire, and 4-wire RTD connections, plus 2-wire and 3-wire resistance devices. That flexibility means one spare module can cover multiple sensor types across your plant—practical when you are standardizing spares for oil and gas skids or process lines.
Where It Fits in Oil, Gas, and Industrial Automation
In upstream oil and gas, RTDs monitor bearing temperatures on pumps and compressors. A failing input module can blind your control system to a hot bearing, risking unplanned downtime. The 1762-IR4 restores that visibility with four channels in a compact 90 x 87 x 40 mm housing. In food and beverage processing, the same module tracks pasteurization and CIP temperatures where accuracy matters. For general industrial automation, it can also monitor displacement on cylinders and clamping devices, giving you more use from one module.
Installation and Setup Notes
Mount the 1762-IR4 on a DIN rail or panel inside a clean, dry, non-hazardous enclosure away from electrical noise and heat. The module receives 5V and 24V DC power through the 1762 bus interface. A finger-safe cover protects the input terminal blocks. Configure each channel after installation, and remember that update time depends on your filter choice and autocalibration settings—fastest with one channel at 1 kHz, slowest with all channels at 10 Hz. Always follow your site’s safety procedures and verify program changes before troubleshooting.
Selection Checklist Before You Buy
Confirm your controller is a MicroLogix 1100, 1200, or 1400. Match your RTD type and wiring (2-wire, 3-wire, or 4-wire) to the module’s compatibility list. Check that your resistance signal falls within the supported ranges. If you need help matching the 1762-IR4 to your existing panel, the team at Oil AutoTech offers hands-on technical selection support. Please verify current lifecycle status and availability with Oil AutoTech before ordering.
Frequently Asked Questions
Which controllers work with the 1762-IR4?
It is a compatible expansion module for MicroLogix 1100, 1200, and 1400 controllers. The number of modules you can use depends on the controller model.
Can I use 2-wire, 3-wire, and 4-wire RTDs on the same module?
Yes. The 1762-IR4 supports 2-wire, 3-wire, and 4-wire RTD connections, as well as 2-wire and 3-wire resistance devices.
How does the module handle noisy signals?
It offers input filters at 10 Hz, 50 Hz, 60 Hz, 250 Hz, 500 Hz, and 1 kHz. Choose a filter based on your update time and noise requirements.
What data formats can I use?
You can format data as raw/proportional, engineering units x 1, engineering units x 10, scaled-for-PID, or percent full scale.
How do I know if the module has a fault?
A single diagnostic LED indicates status and power, and the module performs both module and channel diagnostics to help identify problems.
