1794-IT8 Allen-Bradley FLEX I/O Datasheet & Technical Manual

Allen-Bradley 1794-IT8 FLEX I/O Thermocouple Input Module 16-Bit

Allen-Bradley 1794-IT8 FLEX I/O Thermocouple Input Module 16-Bit

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Allen-Bradley 1794-IT8 FLEX I/O Thermocouple Input Module The Allen-Bradley 1794-IT8, also cataloged as the 1794-IT8 Thermocouple Input Module, operates as...

SKU: 1794-IT8

Manufacturer: Allen Bradley
Product No.: 1794-IT8
Product Type: Thermocouple Input Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 200g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Allen-Bradley 1794-IT8 FLEX I/O Thermocouple Input Module

The Allen-Bradley 1794-IT8, also cataloged as the 1794-IT8 Thermocouple Input Module, operates as a dedicated hardware component for low-level analog signal conversion within FLEX I/O network architectures. Configured with an integrated 16-bit Sigma-Delta analog-to-digital converter, the unit conditions voltage levels across eight differential channels. The module processes millivolt potential changes directly from field-mounted thermal sensors, maintaining channel-to-logic isolation while routing digitized temperature data to the primary control bus.

Hardware Specifications

Parameter	Specification
Model	1794-IT8
Brand	Allen-Bradley
Origin	USA
Weight	0.2 kg
Dimensions	94.0 x 45.7 x 53.3 mm
Operating Temp	-20 deg C to +55 deg C
Power Consumption	Max 3.0 W @ 31.2 VDC
Channel Count	8 Differential channels
Resolution	16-bit (2.384 uV/LSB)
Flexbus Current	20 mA @ 5 VDC

I/O Density Scaling & Backplane Bus Integrity

The 1794-IT8 utilizes modular Flexbus interconnects to optimize I/O density scaling across distributed rack structures. Backplane bus communication velocity remains stable during high-density multi-channel sampling due to the module's 16-bit data frame formatting. Direct coupling to terminal base units—such as the 1794-TB3T—allows external Cold Junction Compensation (CJC) thermistors to interface with the signal path, ensuring accurate analog conversion without introducing bus latency or firmware flash compatibility errors.

Frequently Asked Questions

Q: Does the 1794-IT8 require a specific terminal base for Cold Junction Compensation?

A: Yes. The 1794-TB3T terminal base unit is recommended because it includes integrated CJC thermistor termination points required for thermal cold junction reference calculations.

Q: Can the 1794-IT8 be hot-swapped while the Flexbus is active?

A: Engineers can remove and insert the module onto its terminal base under power (RIUP feature). However, field signal wiring must remain de-energized to prevent transient ground currents from disturbing adjacent I/O slots.

Q: What input formats does the module output to the controller memory array?

A: Data values convert directly into either 16-bit 2's complement or Offset Binary formats, selectable via the host controller I/O configuration table.

Field Installation Guidelines

Mounting: Snap the terminal base securely onto a standard 35 mm DIN rail inside an IP54-rated cabinet. Align the 1794-IT8 module guide pins with the base connector and press firmly until the mechanical locking latch snaps into position.

Wiring and Shielding: Connect thermocouple extension leads or millivolt signal conductors to the designated terminal block points. Ground the cable shielding strictly at the terminal base earth point or cabinet grounding bar. Avoid running low-level sensor cabling parallel to 120/230 VAC power conduits to prevent electromagnetic induction.

Cold Junction Sensor Setup: Verify that CJC sensors install securely in the designated terminal base slots on the 1794-TB3T. Improper CJC sensor placement induces signal drift and skews 16-bit digital conversion accuracy across all eight channels.

Power and Grounding: Connect a regulated 24 VDC external power supply to the terminal base power terminals. Ensure the cabinet ground connection exhibits low impedance to maintain the 850 VDC isolation barrier between field inputs and logic circuits.

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