Allen-Bradley 1794-IT8/A FLEX I/O Thermocouple Input Module
$123.00
$320.00
Description
Allen-Bradley 1794-IT8/A FLEX I/O Thermocouple Input Module
Configured for thermocouple and millivolt signal acquisition in FLEX I/O platforms, the Allen-Bradley 1794-IT8/A (1794-IT8 FLEX I/O Thermocouple Input Module) provides direct physical/electrical execution. The module processes 8 differential thermocouple or mV input channels with onboard cold-junction compensation and configurable sensor input ranges.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-IT8/A |
| Brand | Allen-Bradley |
| Product Type | Thermocouple Input Module |
| Number of Inputs | 8 differential input channels |
| Input Signal Types | Thermocouple types B, C, E, J, K, N, R, S, T; mV signals |
| Millivolt Input Ranges | +/-30 mV, +/-78 mV |
| Resolution | 16 bits |
| Conversion Type | Sigma-Delta conversion |
| Data Format | 16-bit 2's complement integer |
| Accuracy | Thermocouple dependent, typically +/-0.05% to +/-0.1% of full scale |
| Cold Junction Compensation | Automatic via external CJC sensors such as 1794-CJC2 |
| Isolation Voltage | 50 V continuous, basic insulation type, channel-to-system |
| FLEXbus Current | 20 mA @ 5 V DC |
| External DC Power Supply | 24 V DC nominal, 10.5 to 31.2 V DC range |
| Power Consumption | 3.0 W maximum @ 31.2 V DC |
| Thermal Dissipation | 10.2 BTU/hr maximum @ 31.2 V DC |
| Terminal Base Units | 1794-TB3T, 1794-TB3TS |
FLEX I/O Platform I/O Density Scaling and Communication Interface
The 1794-IT8/A is designed for FLEX I/O system integration where multiple field signal modules share a common I/O architecture. The module performs local analog signal conversion and transfers processed data through the FLEXbus backplane interface. Channel configuration allows individual thermocouple type selection and millivolt range assignment without external signal conditioning hardware. The architecture supports I/O density scaling by adding compatible FLEX I/O modules within the same node structure.
Frequently Asked Questions (FAQ)
Q: Can the 1794-IT8/A accept different thermocouple types on separate channels?
A: Yes. Each input channel can be individually configured for supported thermocouple types or millivolt ranges.
Q: Does the module provide channel-to-channel isolation?
A: No. The module uses differential inputs with non-isolated channel-to-channel configuration. Isolation is specified as channel-to-system basic insulation.
Q: What external components are required for cold-junction compensation?
A: Cold-junction compensation requires compatible external CJC sensors such as the 1794-CJC2 when used with thermocouple inputs.
Field Installation Guidelines
Install the module on compatible FLEX I/O terminal bases including 1794-TB3T or 1794-TB3TS models. Verify terminal base wiring before applying field power.
Use shielded thermocouple wiring where required by the installation environment. Connect cable shields according to site grounding practices and avoid routing low-level thermocouple signals parallel to high-current power conductors.
Maintain separation between analog input wiring and sources of electrical noise such as motor feeders, contactors, and variable frequency drive output cables. Confirm thermocouple polarity, sensor type configuration, and CJC wiring before commissioning.
Verify the 24 V DC supply range and FLEXbus connection before module operation. Follow the applicable FLEX I/O installation manual for grounding, mounting, and replacement procedures.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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