The 1794-IR8 is a precision 8-channel RTD input module from Rockwell Automation. It provides direct temperature sensing for your distributed control system. This module converts analog resistance signals into digital data for your PLC.
This module supports a wide variety of RTD sensors. You can connect platinum, nickel, and copper elements for versatile temperature monitoring. The 1794-IR8 offers 16-bit resolution across 435 ohms for accurate measurement.
Sensor Compatibility and Signal Range
The module works with many sensor types including 100 Ω platinum. It supports both European and U.S. curve standards for global applications. You can also connect 10 Ω copper sensors for specific industrial tasks.
The nominal input range spans from 1 to 433 ohms. This wide range accommodates different temperature transducers easily. Each channel provides a precise 718.36 µA excitation current for the sensor.
High Accuracy and Noise Rejection
The 1794-IR8 achieves a typical accuracy of 0.01% full scale in enhanced mode. This happens without requiring any calibration at low humidity. Normal mode delivers a maximum accuracy of 0.05% full scale.
Normal mode noise rejection measures -60 dB at 60 Hertz. This filters out electrical noise from power lines effectively. The channel bandwidth sits between 0 and 2.62 Hertz for stable readings.
Expert Technical Evaluation and Performance Review
The module provides strong electrical isolation for system protection. It has an isolation voltage tested at 850 Volts DC. This protects sensitive logic circuits from high-voltage transients.
Common mode rejection reaches -120 dB at 60 Hertz. This prevents ground loop interference from affecting your data. The overvoltage capacity reaches 35 Volts DC continuously at 25 degrees Celsius.
Operating temperature ranges from 0 to 55 degrees Celsius. Storage conditions allow for -40 to 85 degrees Celsius for flexibility. The module handles 5g vibration from 10 to 500 Hertz without issues.
The 1794-IR8 offers two data formats for your system. You can select 16-bit 2's complement or offset binary. System throughput is programmable from 28ms to 325ms per channel in normal mode.
The module uses a DIN rail mounting method for quick installation. It works with the 1794-TB2, 1794-TB3, or 1794-TB3T terminal bases. The wire size depends entirely on your chosen terminal base accessory.
Logistics and Standard Packaging Details
The 1794-IR8 consumes only 3 Watts at 31.2 Volts DC maximum. Thermal dissipation stays low at 10.2 BTU per hour. This makes the module ideal for dense cabinet installations with limited airflow.
