The Allen-Bradley 1794-IT9 provided by Yueyang Tongtu is a high-density, 8-channel isolated analog input module within the Rockwell Automation FLEX™ I/O system. Specially engineered to capture ultra-weak signals without drift, it provides signal between high-temperature process environments and industrial controllers like ControlLogix, CompactLogix, or SLC 500 systems.
Directly connects with J, K, T, E, R, S, B, and N type thermocouples, while also handling direct millivolt inputs within the range.
Built-in channel-to-channel isolation prevents ground loops and helps reduce signal instability caused by electrical noise and grounding issues.
Converts microvolt-level temperature sensor changes into precise 16-bit digital signals, guaranteeing accurate process monitoring.
Features internal cold-junction compensation to maintain high measurement accuracy even under fluctuating control cabinet ambient temperatures.
Mounts seamlessly onto standard 1794 Terminal Base Units (TBUs) and communicates across EtherNet/IP, ControlNet, or DeviceNet via FLEX I/O network adapters (e.g., 1794-AENT).
|
Feature / Parameter |
Technical Specification |
|
Model Number |
Allen-Bradley 1794-IT9 |
|
Product Type |
Isolated Thermocouple / Millivolt Input Module |
|
System Series |
1794 FLEX™ I/O System |
|
Number of Inputs |
8 Isolated Channels |
|
Input Ranges |
Thermocouple: J, K, T, E, R, S, B, N Types / |
|
Mounting Format |
DIN Rail Mounting (via 1794 Terminal Base Unit) |
|
Network Support |
EtherNet/IP, ControlNet, DeviceNet (Adapter-dependent) |
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Certifications |
CE Marked, UL Listed, CSA, C-Tick |
To ensure seamless deployment and avoid ordering errors, pair the Allen-Bradley 1794-IT9 with the appropriate terminal base unit (TBU) and adapter:
• 1794-TB3T: Recommended for thermocouple inputs; provides built-in cold junction compensation (CJC) terminals.
• 1794-TB3G: Suitable for grounded sensor applications requiring extended grounding points.
• 1794-AENT / 1794-AENTR: For dual/single-port EtherNet/IP industrial networks.
• 1794-ACN15 / 1794-ACNR15: For ControlNet architecture.
• 1794-ADN: For DeviceNet fieldbus systems.
Petrochemical & Oil/Gas: Real-time temperature monitoring for reaction vessels, cracking furnaces, and transport pipelines to maintain operational safety.
Power Generation & Energy Distribution: Precise monitoring of turbine bearing temperatures, boiler steam conditions, and transformer heating.
Metal Processing & Metallurgy: Temperature tracking in heat treatment furnaces, annealing lines, and continuous casting systems.
Discrete Manufacturing & Automotive: Automated process heating, thermal curing ovens, and climate-controlled assembly lines.
Do not use standard 2-wire terminal bases (like 1794-TB2); the 1794-IT9 requires a 3-wire or specialized CJC-equipped base unit (such as 1794-TB3T) to function accurately.
Run thermocouple extension wires in separate, shielded conduits away from high-voltage power lines by at least to prevent signal distortion.
Although FLEX I/O supports Removal and Insertion Under Power (RIUP), ensure the terminal base keyswitch is set to position 3 before installing the 1794-IT9.
1. Genuine Guarantee: Sourced through legitimate, verified supply channels with with available product documentation and traceable supply records —zero refurbished or counterfeit parts.
2. Pre-Shipment Inspection: Every unit undergoes visual verification, pin-integrity checks, and anti-static ESD packaging before dispatch.
3. Technical Integration Support: Free guidance on module hardware configuration, I/O mapping, and communication setup for Rockwell Automation platforms (ControlLogix, CompactLogix, and SLC 500).
A: The 1794-IT9 specializes in thermocouple and inputs with channel isolation, making it ideal for high-temperature and weak millivolt applications. The 1794-IRT8, on the other hand, is a combination module that handles both RTD (Resistance Temperature Detector) and thermocouple sensors on non-isolated channels.
A: Yes. While the module mounts on a FLEX I/O base, it connects to SLC 500 systems via a 1747-SN RIO Scanner module or through an EtherNet/IP adapter (1794-AENT) linked to modern PLC architectures.
A: First, verify that you are using a 1794-TB3T terminal base with properly wired Cold Junction Compensation (CJC) sensors. Second, check that sensor shielding is grounded at a single point and isolated from power lines
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