Allen-Bradley 1769-IT6 Thermocouple Input Module

Allen-Bradley 1769-IT6 Thermocouple/mV Input Module – Product Introduction

The Allen-Bradley 1769-IT6 belongs to the Compact I/O series and serves as a high-precision analog input module. Specifically, it handles both thermocouple and millivolt signals across its six individually configurable channels. This module supports popular thermocouple types, including J, K, T, E, R, S, B, N, and C, while also accepting ±50 mV and ±10 mV DC inputs.

Additionally, the 1769-IT6 includes two cold junction compensation (CJC) sensors to improve measurement accuracy. It communicates with CompactLogix controllers via the backplane bus, drawing power directly from the 5V and 24V DC system supply. With its robust diagnostic features, auto-calibration routine, and selectable digital filters, this module provides reliable data for temperature-critical processes.

Key Technical Specifications

The 1769-IT6 offers a wide operating range and exceptional linearity. Its nonlinearity is rated at ±0.03%, ensuring consistent readings. For thermocouple inputs, the measurable temperature ranges are extensive: Type J from -210 to +1200 °C, Type K from -270 to +1370 °C, Type T from -270 to +400 °C, Type E from -270 to +1000 °C, Type R from 0 to +1768 °C, Type S from 0 to +1768 °C, Type B from +300 to +1820 °C, Type N from 210 to +1300 °C, and Type C from 0 to +2315 °C.

Furthermore, the millivolt input ranges are -50 to +50 mV and -10 to +10 mV. The module uses a Delta-Sigma converter technology, which provides excellent noise rejection. Specifically, it achieves a common mode rejection ratio of 115 dB and a normal mode rejection ratio of 85 dB at 50 to 60 Hz.

The 1769-IT6 draws a maximum current of 100 mA at 5.1V DC and 40 mA at 24V DC. Its total heat dissipation is 1.5 W. The input impedance is less than 10 mV, and the rated working voltage is 30V AC/DC. For calibration, the module performs an automatic routine at power-up, and users can also program it to run every five minutes.

Advanced Diagnostic and Configuration Features

This I/O module stands out due to its comprehensive diagnostic capabilities. For each of the six channels, the 1769-IT6 provides over-range, under-range, and open-circuit detection. The open-circuit detection time typically ranges from 7 milliseconds to 2.1 seconds, depending on the selected filter.

Moreover, users can choose from six selectable input filters to stabilize measurements in noisy environments. These filters include 10 Hz, 50 Hz, 60 Hz, 250 Hz, 500 Hz, and 1 kHz. Each channel can be independently configured for engineering units, scaled-for-PID, or raw/proportional data formats. This flexibility makes the 1769-IT6 suitable for various applications, from basic temperature monitoring to complex closed-loop control.

Mechanical and Environmental Ratings

The 1769-IT6 is built to withstand harsh industrial conditions. It operates reliably within a temperature range of 0 to 60 °C (32 to 140 °F) and can be stored between -40 and 85 °C (-40 to 185 °F). The module tolerates operating shock of 30 g for 11 milliseconds and non-operating shock of 40 g when panel-mounted.

In terms of physical dimensions, the module measures 118 mm (H) x 87 mm (W) x 35 mm (D) and weighs approximately 276 grams. It is rated for a power supply distance of up to eight modules, ensuring flexible system layouts. For wiring, the manufacturer recommends using Belden 8761 shielded cable, and the terminal block supports solid copper wire sizes from 22 to 14 AWG.

Installation and Mounting Guidelines

Installing the 1769-IT6 is straightforward, as it occupies a single slot in the Compact I/O chassis. You can attach it to an adjacent I/O module or directly to the controller. Importantly, to minimize electrical noise, position this module at least two slots away from any AC power supply. Additionally, maintain a minimum clearance of two inches on all sides for adequate ventilation and heat dissipation.

Furthermore, the module receives its operating power from the communication bus, eliminating the need for an external power supply. It is compatible with 1769-ADN (DeviceNet) and 1769-AENTR (Ethernet) adapters, integrating seamlessly into Rockwell Automation systems. The replacement door label part number is 1769-RL2 series B, and the replacement terminal block part number is 1769-RTBN18.

Packaging List

• Allen-Bradley 1769-IT6 Thermocouple/mV Input Module (1 unit)

• Removable terminal block (1769-RTBN18)

• Door label (1769-RL2 series B)

• User manual (digital version available via download)

• Mounting screws and hardware kit

Note: The module is shipped in anti-static packaging to prevent damage during transit.

Shipping Information

We ship all orders via FedEx, UPS, or DHL to ensure fast and reliable delivery. Tracking numbers are provided upon dispatch. Expedited shipping options are available upon request.

Frequently Asked Questions (FAQ)

Q1: What thermocouple types are compatible with the 1769-IT6?
A: The 1769-IT6 supports Types J, K, T, E, R, S, B, N, and C thermocouples. It also accepts ±50 mV and ±10 mV DC millivolt signals.

Q2: Does this module require an external 24V power supply?
A: No. The 1769-IT6 draws all required power from the Compact I/O bus (5V and 24V DC). It does not need a separate external supply.

Q3: How does the auto-calibration feature work?
A: The 1769-IT6 performs auto-calibration at power-up for every enabled channel. You can also program it to run every five minutes automatically to maintain long-term accuracy.

Q4: Can I use this module with an EtherNet/IP network?
A: Yes. The 1769-IT6 works with the 1769-AENTR Ethernet adapter, allowing seamless integration into EtherNet/IP networks alongside CompactLogix controllers.

Q5: What is the typical response time for open-circuit detection?
A: The detection time varies from 7 milliseconds to 2.1 seconds, depending on the input filter configuration you select for the channel.