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Allen-Bradley 1794-IT8 Flex I/O Analog Input Module

Allen-Bradley 1794-IT8 Flex I/O Analog Input Module

Series#: AllenBradley

Product Details

1794-IT8 Allen-Bradley FLEX I/O Analog Input Module – Precision Temperature Measurement Solution.
8-channel isolated thermocouple or millivolt input module for industrial process control.
Supports J, K, T, E, R, S, B, N, and C thermocouple types plus ±50 mV and ±100 mV ranges.
Built-in cold junction compensation (CJC) and open-circuit detection for reliable readings.
Compact FLEX I/O form factor reduces panel space and simplifies wiring in distributed systems.
Compatible with Allen-Bradley ControlLogix, CompactLogix, and SLC 500 platforms via communication adapters.
Guaranteed 100% Original factory condition, offering fast and secure worldwide delivery.

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Specification

Datasheet (PDF)

The 1794-IT8 is a high-performance FLEX I/O analog input module from Allen-Bradley, engineered for precise temperature and low-level voltage measurement in harsh industrial environments. This 8-channel isolated module accepts a wide range of thermocouple types as well as millivolt signals, making it ideal for process control, furnace monitoring, and chemical plant applications. Each channel features individual isolation to minimize ground loop interference, while onboard cold junction compensation ensures accuracy across ambient temperature variations. The module communicates via the FLEX I/O backplane, supporting seamless integration with Rockwell Automation controllers. With robust diagnostics including open-circuit detection and over-range indication, the 1794-IT8 delivers reliable data for critical loops. Its rugged design and compact footprint make it a trusted choice for distributed I/O architectures in oil & gas, power generation, and manufacturing sectors.

Parameter	Specification
Product Type	FLEX I/O Analog Input Module
Model Number	1794-IT8
Number of Input Channels	8 (isolated, differential)
Input Signal Types	Thermocouple (J, K, T, E, R, S, B, N, C) and Millivolt (±50 mV, ±100 mV)
Isolation Voltage	500V AC/DC (channel-to-channel and channel-to-backplane)
Cold Junction Compensation	Internal, with CJC sensor on terminal base
Accuracy (Typical)	±0.1% of full scale (at 25°C); ±0.5% over temperature range
Resolution	16 bits (including sign)
Input Impedance	>10 MΩ (voltage mode)
Update Rate	50 ms per channel (typical)
Common Mode Rejection Ratio (CMRR)	>120 dB at 50/60 Hz
Normal Mode Rejection Ratio (NMRR)	>60 dB at 50/60 Hz
Open Circuit Detection	Yes, per channel (user-configurable)
Overvoltage Protection	±30V DC continuous
Power Supply Requirement	24V DC (nominal) via FLEX I/O backplane
Power Consumption	3.5W (maximum)
Operating Temperature	0°C to +60°C (32°F to 140°F)
Storage Temperature	-40°C to +85°C (-40°F to 185°F)
Relative Humidity	5% to 95% (non-condensing)
Vibration Resistance	5 g Standard Models 10–500 Hz (operating)
Shock Resistance	30 g (11 ms half-sine)
Enclosure Type	Open-style, suitable for panel mount (IP20 rating with terminal base)
Communication Protocol	FLEX I/O backplane (compatible with 1794-ADN, 1794-ACN, etc.)
Dimensions (H x W x D)	Approx. 87 mm x 46 mm x 75 mm (3.4" x 1.8" x 3.0")
Weight	Approx. 0.15 kg (0.33 lb)
Approvals	UL, CSA, CE, ATEX (Zone 2) for hazardous locations
Wiring Style	Removable terminal block (1794-TB3 or 1794-TB3S)
LED Indicators	Status per channel (green/red) and module health (green/red)