A-B 1734-IT2I Thermocouple Input Module

A-B 1734-IT2I Thermocouple Input Module

The Allen-Bradley 1734-IT2I is a POINT I/O 2-channel thermocouple input module used in distributed I/O systems to measure temperature signals from thermocouples and convert them into PLC data.

Product Information

• Brand: Allen-Bradley (Rockwell Automation)
• Series: POINT I/O 1734
• Part Number: 1734-IT2I
• Type: Thermocouple Input Module
• Channels: 2 differential inputs
• Signal Type: Thermocouple (mV level input, ±75 mV range)

Key Technical Specifications

• Inputs: 2 thermocouple channels
• Input range: approximately ±75 mV
• Resolution: 15-bit + sign high precision conversion
• Accuracy: about 0.1% full scale @ 25°C
• Cold Junction Compensation (CJC): supported via 1734-TBCJC terminal base
• Isolation: up to 50V continuous isolation (I/O to system)
• Power consumption: POINTBus powered via 1734 backplane (24V system supply)

Function (Simple Explanation)

This module is used to:

• Read thermocouple temperature sensors (Type J, K, T, etc. depending configuration)
• Convert very small mV temperature signals into digital PLC data
• Provide accurate temperature monitoring for industrial processes

It does NOT output signals — it only receives temperature inputs.

System Role

Thermocouple (field temperature sensor)
→ 1734-IT2I module
→ POINT I/O adapter
→ PLC (CompactLogix / ControlLogix)

So it is a high-precision temperature acquisition module.

Application Areas

• Furnace temperature monitoring
• Heat treatment systems
• Plastic injection molding machines
• Chemical process temperature control
• HVAC and industrial heating systems
• Power plant temperature measurement

Key Features

• High-accuracy temperature measurement
• Supports 2 independent thermocouple channels
• Cold junction compensation support
• High noise immunity for industrial environments
• Easy integration into Rockwell POINT I/O systems

Precautions

• Must use correct terminal base (with CJC support)
• Thermocouple wiring must be polarity-correct
• Keep away from strong electrical noise sources
• Do not mix thermocouple types without configuration
• Ensure proper grounding and shielding for accuracy