Allen-Bradley 1734-IR2E RTD Input Module | POINT I/O

1734-IR2E Product Introduction

The 1734-IR2E from Allen‑Bradley is a high-performance analog temperature input module designed for the POINT I/O family. This module features two single-ended, non-isolated high-resolution RTD inputs that deliver precise temperature measurements. With its 16-bit resolution at 2.4 milliohms per count and 0.006 °C per count, the 1734-IR2E ensures exceptional detail in temperature tracking. Furthermore, this module supports four predefined temperature scales—Celsius, Fahrenheit, Kelvin, and Rankine—plus one custom scale in mV. Consequently, it adapts easily to various application requirements without additional programming.

High-Resolution Measurement and Accuracy 1734-IR2E

The 1734-IR2E provides outstanding measurement precision for critical temperature monitoring. Specifically, it achieves an absolute accuracy of 0.1% of full scale at 25 °C, with an accuracy drift of only 30 ppm per °C for ohm inputs. Such performance guarantees reliable data even in fluctuating thermal environments. Additionally, the module offers a normal mode rejection ratio of 100 dB and a common mode rejection ratio of 120 dB. These high rejection ratios effectively minimize electrical noise interference, ensuring stable and consistent readings. Therefore, engineers can depend on the 1734-IR2E for demanding process control applications.

Built-In Diagnostic and Alarm Features 1734-IR2E

This analog input module includes comprehensive diagnostic capabilities that simplify troubleshooting. The 1734-IR2E provides alarms for over-range, under-range, low level, high level, and open wire conditions. Meanwhile, the module generates up to 6 bytes of fault status data and input data without consuming any additional I/O data. Users can monitor network status, module status, and input status in real time through the built-in LED indicators. These features significantly reduce downtime and maintenance efforts, making the 1734-IR2E a reliable choice for continuous operation environments.

Flexible Input Range and Configuration

The 1734-IR2E accepts an input range of 0 to 220 ohms, accommodating various RTD sensor types. Its input step response ranges from 6 to 60 milliseconds, allowing users to balance speed and stability based on specific process needs. Moreover, the module provides flexible configuration options for temperature scales and alarm thresholds. Users can easily adjust these settings through the configuration software, streamlining system commissioning. This versatility ensures that the 1734-IR2E performs optimally across diverse industrial applications, from HVAC systems to chemical processing.

Mechanical and Environmental Specifications

Physically, the 1734-IR2E measures 2.97 x 0.47 x 2.21 inches (75.5 x 12 x 56 mm) and weighs just 0.08 pounds (0.036 kg). Its open-style enclosure requires installation inside a protected cabinet. The module operates reliably between -20 °C and 55 °C, accommodating most factory floor conditions. Power dissipation is rated at 1 watt, with thermal dissipation of 3.3 BTU/hour. Additionally, the isolation voltage is 50 volts continuous, providing basic circuit protection. The keyswitch position is set to 6, which prevents incorrect insertion into the backplane.

Installation and Wiring Guidance

Mounting the 1734-IR2E requires a compatible terminal base unit, such as the 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS. These bases provide the physical interface to the POINT I/O backplane. During installation, note that users can only use 22 to 14 AWG shielded thermocouple wire with this module. Proper shielding and grounding are essential to maintain measurement integrity. Since the inputs are single-ended and non-isolated, keep sensor wiring separate from high-voltage conductors. No external DC power supply is needed, as the module draws power directly from the backplane.

Data Format and System Integration

The 1734-IR2E outputs data as signed integers, ensuring seamless integration with Rockwell Automation controllers. Its 16-bit resolution delivers detailed temperature readings for precise process control. The module does not consume any I/O data for its fault status information, preserving system resources. This efficient data handling makes the 1734-IR2E ideal for distributed I/O architectures. Additionally, the flexible temperature scale options reduce programming complexity and accelerate project deployment.

Typical Applications

This Allen‑Bradley 1734-IR2E module suits a wide range of industries, including pharmaceuticals, food and beverage, HVAC, and semiconductor manufacturing. For example, it monitors fermentation temperatures in bioreactors or tracks bearing temperatures in large motors. Its built-in diagnostic alarms make it particularly valuable for critical processes where early fault detection prevents costly downtime. Furthermore, the compact POINT I/O form factor allows dense channel mounting in space-limited control panels. Therefore, the 1734-IR2E offers an excellent balance of performance, reliability, and value.

Frequently Asked Questions (FAQ)

1. What is the resolution of the 1734-IR2E module?
The 1734-IR2E offers a 16-bit resolution at 2.4 milliohms per count and 0.006 °C per count. This high resolution ensures precise temperature measurements for demanding applications.

2. What type of wiring is required for the 1734-IR2E?
Users must use 22 to 14 AWG shielded thermocouple wire with this module. Proper shielding minimizes electrical noise and ensures accurate readings.

3. Does the 1734-IR2E need an external power supply?
No, the 1734-IR2E does not require an external DC power supply. It draws all necessary power directly from the POINT I/O backplane.

4. What diagnostic features does the 1734-IR2E provide?
This module offers alarms for over-range, under-range, low level, high level, and open wire conditions. It also generates fault status data and provides real-time status through LED indicators.

5. Can the 1734-IR2E measure in Fahrenheit instead of Celsius?
Yes, the 1734-IR2E supports four predefined temperature scales: Celsius, Fahrenheit, Kelvin, and Rankine. Users can also configure one custom scale in mV.