Allen-Bradley 1756-IT16 ControlLogix Thermocouple Input Module, 16-Point

Product Introduction

In the evolving landscape of industrial automation, precise temperature measurement is critical for process control and product quality. The Allen-Bradley 1756-IT16 ControlLogix Non-Isolated Thermocouple/mV Input Module addresses this need with high-density, accurate input capabilities. As part of the ControlLogix 1756 family, this module provides 16 non-isolated channels for thermocouple or millivolt signals, enabling advanced control in demanding applications. Designed for chassis mounting, it offers a compact solution for systems requiring multiple temperature inputs without sacrificing performance.

Technical Specifications Breakdown

The 1756-IT16 delivers 24-bit data resolution, ensuring high accuracy for temperature readings. It supports thermocouple types B, C, E, J, K, N, R, S, and T, as well as mV input sensors. The input range spans -100 to 100 millivolts, with a maximum of 5 Volt-Amps. Isolation voltage is rated at 250 Volts continuous, protecting the system from ground loops. Current draw is 200 milliAmps at 5.1 Volts DC and 80 milliAmps at 24 Volts DC. Operating temperature ranges from 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit). Power dissipation is 3 Watts maximum, with thermal dissipation up to 9.9 BTU per hour. Overvoltage protection is ±30 Volts DC, and normal mode noise rejection is 75 decibels at 60 Hertz. The module uses ITS-90 thermocouple linearization and requires two CJC sensors (sold separately, part number 1756-CJC) for thermocouple mode operation.

Industry Applications

The 1756-IT16 excels in industries requiring multi-point temperature monitoring, such as chemical processing, food and beverage, and pharmaceutical manufacturing. In a chemical reactor, the module can monitor 16 thermocouple points simultaneously, providing real-time data for precise temperature control. Its high resolution and support for multiple thermocouple types make it ideal for applications with varying temperature ranges. The non-isolated design suits systems where isolation is provided at the sensor level, reducing cost and complexity.

Installation & Setup Guidance

Mount the 1756-IT16 directly into a ControlLogix chassis. Ensure the module is properly seated and secured. For thermocouple mode, install two CJC sensors (1756-CJC) near the module to compensate for cold junction temperature. Connect thermocouple wires to the terminal block, observing polarity. The module automatically detects sensor type based on configuration. Verify wiring before powering the system. Use the status LED display to confirm module health and channel status.

Maintenance & Reliability

Regular inspection of connections and CJC sensors ensures reliable operation. The module's solid-state design minimizes wear, but environmental factors like temperature extremes and vibration can affect performance. Keep the chassis clean and within the specified operating temperature range of 0 to 60 degrees Celsius. Periodically verify calibration using a known reference to maintain accuracy. The 1756-IT16's robust construction supports long service life in industrial environments.

Compatibility & Integration

The 1756-IT16 integrates seamlessly with ControlLogix controllers via the backplane. It is compatible with Rockwell Automation's RSLogix 5000 and Studio 5000 environments for configuration and programming. The module supports both thermocouple and millivolt input modes, configurable through software. It works with a range of thermocouple types, offering flexibility for diverse applications. For systems requiring isolation, consider isolated input modules from the same series.

Selection Guide & Purchasing Advice

Before purchasing the 1756-IT16, verify compatibility with your ControlLogix chassis and controller. Note that CJC sensors (1756-CJC) are required for thermocouple mode and must be ordered separately. Check the module's lifecycle status with your supplier. At plcmatrix.com, we offer the 1756-IT16 as a new, surplus, or obsolete part, ensuring availability for your project. Contact our team for current stock and pricing. We provide fast shipping and expert support for all industrial automation components.