Product Overview
The Allen-Bradley 1734-IT2I is a POINT I/O Analog Temperature Input Module engineered for precision temperature monitoring in industrial automation systems. As part of the POINT I/O series, this module delivers reliable, isolated thermocouple inputs that integrate seamlessly into Rockwell Automation architectures.
With two differential individually-isolated thermocouple inputs, the 1734-IT2I provides accurate temperature readings while maintaining electrical isolation between channels. The module supports real-time status monitoring through its front-panel indicators, showing network status, module status, and the status of input 0 and input 1. This visibility simplifies troubleshooting and reduces downtime.
Technical Specifications Breakdown
The 1734-IT2I offers a resolution of 15 bits, ensuring fine granularity for temperature measurement. Its input voltage range is ±75 mV, suitable for standard thermocouple signals. The module draws 175 mA from the POINTBus at 5 V DC, making it energy-efficient within the backplane.
Key specifications include:
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Inputs: 2 Thermocouple (differential, individually isolated)
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Resolution: 15 bits (2.5 µV/count)
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Input Voltage: ±75 mV
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POINTBus Current: 175 mA at 5 V DC
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Key Switch Position: 6
The module supports signed integer data formats across four temperature scales—Celsius, Fahrenheit, Kelvin, and Rankine—plus a custom mV scale. Its Delta Sigma conversion type ensures stable, accurate readings. Alarm conditions include under-range, over-range, cold junction compensation (CJC) open-wire detection, and level alarms (low-low, low, high, high-high), providing comprehensive fault protection.
Industry Applications
The 1734-IT2I excels in applications requiring precise temperature monitoring, such as:
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Process Control: Monitor reactor temperatures in chemical plants, where ±75 mV thermocouple inputs capture subtle variations.
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HVAC Systems: Track duct and ambient temperatures to optimize energy consumption in large facilities.
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Manufacturing Lines: Ensure proper heat treatment in ovens or furnaces, using the module's high resolution to maintain quality.
Its compact form factor (2.21 x 0.47 x 2.97 inches) and light weight (0.08 lb) make it ideal for space-constrained panels.
Installation & Setup Guidance
Install the 1734-IT2I only on the 1734-TBCJC wiring base assembly. No external DC power supply is required; the module draws power from the POINTBus. Follow these steps for proper setup:
- Mount the module onto the 1734-TBCJC base, ensuring the key switch is set to position 6.
- Connect thermocouple wires to the appropriate terminals, respecting polarity and shielding.
- Configure the module using your control software, selecting the desired temperature scale (Celsius, Fahrenheit, Kelvin, Rankine) or mV custom scale.
- Set alarm thresholds for under-range, over-range, and CJC open-wire detection as needed.
Ensure the wiring base is correctly terminated to the POINTBus to maintain communication integrity.
Maintenance & Reliability
Regular inspection of the 1734-IT2I ensures long-term reliability. Check thermocouple connections periodically for corrosion or loose terminations, which can cause false readings. The module operates in temperatures from -20 to 55 °C and can be stored from -4 to 85 °C, with non-condensing relative humidity of 5 to 95%. Its open-style enclosure allows heat dissipation, but ensure adequate airflow in the cabinet.
With a maximum power dissipation of 1 W and thermal dissipation of 3.3 BTU/hr, the module runs cool, extending its service life. Vibration resistance up to 5 g at 10-500 Hz and shock tolerance (30 g operating, 50 g non-operating) make it suitable for demanding industrial environments.
Compatibility & Integration
The 1734-IT2I integrates with Rockwell Automation's POINT I/O platform, communicating via the POINTBus backplane. It works with compatible scanners and controllers, producing eight bytes of scanner data (Rx) and fault status data without consuming I/O data (Tx). This efficiency preserves bandwidth for other I/O modules.
Status indicators provide real-time feedback, enabling quick diagnostics. The module's isolation voltage of 50 V continuous ensures safe operation in mixed-voltage environments.
Selection Guide & Purchasing Advice
Before purchasing the 1734-IT2I, verify your system's POINTBus capacity and available key switch positions. Ensure you have the 1734-TBCJC wiring base assembly, as the module is not compatible with other bases. Confirm your thermocouple types and required temperature ranges to match the ±75 mV input range.
For reliable sourcing and competitive pricing, consider PLC Source PRO as your supplier for the Allen-Bradley 1734-IT2I and other industrial automation spares. With a focus on quality and availability, PLC Source PRO supports your operational uptime.