PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1794-IRT8XT is a FLEX I/O Analog Input Module for processing temperature sensor signals. This unit accepts inputs from resistance temperature detectors and thermocouples. The module provides eight input channels organized into two groups of four channels. Thermocouple input signals operate across a range of -40 to 100 millivolts DC. RTD sensor inputs function across a nominal span of 0 to 325 millivolts DC.
Analog signal conversion is executed at a 14-bit resolution across all channels. An external power supply rating of 24 Volts DC powers the hardware. The module draws a nominal supply current of 95 milliamperes at 24 Volts DC. Continuous isolation voltage for the unit is rated at 50 Volts DC. The open-style construction requires installation inside an appropriate industrial enclosure. Open sensor inputs trigger status detection within a maximum of two scan cycles.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Product Line | Flex I/O 1794 |
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| UPC | 612598731206 |
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| Weight | 0.31 lbs (0.14 kg) |
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| Number of Input Channels | 8 input channels (divided into two groups of 4 channels) |
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| Enclosure Style | None (open-style enclosure) |
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| Nominal Input Voltage Range | -40 to 100 millivolts DC for thermocouples; 0 to 325 millivolts for RTDs |
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| Types of Supported Thermocouples | Type B, E, J, K, TXK/XK(L), N, R, S, and T |
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| Resolution | 14 bits |
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| Isolation Voltage Rating | 50 Volts (continuous) |
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| External Power Supply Voltage | 24 Volts DC |
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| Supply Current | 95 milliamperes at 24 Volts DC |
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| Maximum Power Dissipation | 3 Watts at 31.2 Volts DC |
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| Local Signalling | 8 red input status indicators and 1 green power status indicator |
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| Open Input Detection Time | Immediately (maximum of 2 scans) |
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| Maximum Thermal Dissipation | 10.2 British Thermal Units per hour at 31.2 Volts DC |
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| Overvoltage Capability | 15 Volts DC (continuous) at 25°C |
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TECHNICAL INFORMATION
Features
- Provides eight analog input channels divided into two groups of four channels.
- Processes both thermocouple and RTD temperature inputs with 14-bit resolution.
- Supports thermocouple types B, E, J, K, TXK/XK(L), N, R, S, and T.
- Detects open input circuits within a maximum of two scan cycles.
- Includes eight red input indicators and one green power status indicator.
- Dissipates a maximum of 3 Watts of power at 31.2 Volts DC.
TECHNICAL INFORMATION
Connections / Interfaces
- Features eight analog input channels split into two groups of four channels.
- Requires an external power supply connection supplying 24 Volts DC.
- Provides visual feedback through eight red input lights and one green power light.
TECHNICAL INFORMATION
Installation Guidelines
- The module features an open-style enclosure design without a protective casing.
- Mount the unit inside a protective enclosure to shield internal components from contaminants.
- Provide proper enclosure cooling to handle thermal dissipation reaching 10.2 BTU per hour.
TECHNICAL INFORMATION
Configuration Guidelines
- Select module settings according to the connected RTD or thermocouple sensor type.
- Configure channel parameters for thermocouple types B, E, J, K, N, R, S, T, or TXK/XK(L).
- Set system monitoring to register open circuit detection within two scan cycles.
TECHNICAL INFORMATION
Compatibility
- Compatible with thermocouple types B, E, J, K, TXK/XK(L), N, R, S, and T.
- Accepts resistance temperature detector inputs across the 0 to 325 millivolts range.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with thermocouple types B, E, J, K, TXK/XK(L), N, R, S, and T. Accepts resistance temperature detector inputs across the 0 to 325 millivolts range.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What sensor types does the 1794-IRT8XT module support?
The module supports RTDs and thermocouple types B, E, J, K, TXK/XK(L), N, R, S, and T.
What is the input resolution of the 1794-IRT8XT?
The 1794-IRT8XT provides 14-bit resolution for converting analog temperature signals.
How fast does the module detect open input conditions?
The unit identifies an open input circuit immediately within a maximum of two scan cycles.
What external power supply does the 1794-IRT8XT require?
The module operates on an external supply voltage of 24 Volts DC drawing 95 milliamperes.
