Allen-Bradley 1794-IR8 Input Module,Flex I/O,RTD,8 Channels RTD Input,Open Style,DI
$854.99
Out of stock
Request QuoteAllen-Bradley 1794-IR8 — The 1794-IR8 is an Allen-Bradley FLEX™ I/O 8-channel RTD Input Module — accepts 2-wire and 3-wire Resistance Temperature Detectors (Pt, Nickel, Copper in 100 Ω through 500 Ω ranges) for high-accuracy temperature measurement. 16-bit resolution across 435 Ω, programmable throughput 28…650 ms/channel, open-RTD detection, 0.01% FS enhanced-mode accuracy.
| Module Type | FLEX I/O 8-channel RTD Input |
| Input Range | 1…433 Ω |
| Supply Current | 140 mA @ 24V DC |
| Resolution | 16 bits across 435 Ω |
| Normal-Mode Accuracy | 0.05% FS (low humidity, no cal) |
| Enhanced-Mode Accuracy | 0.01% FS (typical, low humidity) |
| Supported Sensors | Pt/Ni/Cu RTDs (100…500 Ω per type) |
Description
Allen-Bradley 1794-IR8
The 1794-IR8 is an Allen-Bradley FLEX™ I/O 8-channel RTD Input Module — accepts 2-wire and 3-wire Resistance Temperature Detectors (Pt, Nickel, Copper in 100 Ω through 500 Ω ranges) for high-accuracy temperature measurement. 16-bit resolution across 435 Ω, programmable throughput 28…650 ms/channel, open-RTD detection, 0.01% FS enhanced-mode accuracy.
| Module Overview | |
|---|---|
| Catalog Number | 1794-IR8 |
| Product Family | FLEX™ I/O (Bulletin 1794) RTD Input |
| Channels | 8 — accepts 2-wire and 3-wire RTDs |
| Input Range | 1…433 Ω |
| Supply Current | 140 mA @ 24V DC |
| Terminal Base Compatibility | 1794-TB3, 1794-TB3S (standard FLEX I/O bases) |
| Open-Style | IP20; requires user enclosure |
| Supported Sensors | |
|---|---|
| Pt — 100 Ω (Euro, α = 0.00385) | -200…+870 °C |
| Pt — 100 Ω (U.S., α = 0.003916) | -200…+630 °C |
| Pt — 200 Ω (Euro) | -200…+630 °C |
| Pt — 500 Ω (U.S.) | -200…+630 °C |
| Nickel — 100 Ω (α = 0.00618) | -60…+250 °C |
| Nickel — 120 Ω (α = 0.00672) | -60…+250 °C |
| Nickel — 200 Ω | -60…+250 °C |
| Nickel — 500 Ω | -60…+250 °C |
| Copper — 10 Ω (α = 0.00427) | -200…+260 °C |
| Performance | |
|---|---|
| Input Resolution | 16 bits across 435 Ω |
| Data Format | 16 bits, 2’s complement, left-justified; offset binary |
| Settling Time | 100% of final value available at system throughput rate |
| System Throughput — Normal Mode | Programmable 28…325 ms/channel — 325 ms (1 ch) to 2.6 s (8 ch) |
| System Throughput — Enhanced Mode | Programmable 56…650 ms/channel — 650 ms (1 ch) to 2.925 s (8 ch) |
| Accuracy — Normal Mode (max) | 0.05% FS (low humidity) without calibration |
| Accuracy — Enhanced Mode (typical) | 0.01% FS (low humidity) without calibration |
| Normal-Mode Rejection Ratio | 60 dB @ 60 Hz (A/D filter cutoff @ 15 Hz); -120 dB @ 60 Hz |
| Common-Mode Rejection Ratio | -100 dB @ 50 Hz (A/D filter cutoff @ 10 Hz) |
| Common-Mode Voltage | 0V between channels (common return) |
| Gain Drift w/ Temperature — Normal | 20 ppm/ °C max |
| Gain Drift w/ Temperature — Enhanced | 10 ppm/ °C max |
| Channel Bandwidth | DC to 2.62 Hz (-3 dB) |
| RTD Excitation Current | 718.39 µA |
| Diagnostics & Protection | |
|---|---|
| Open RTD Detection | Out-of-range upscale reading |
| Open Circuit Detection Type | Available at system throughput rate |
| Overvoltage Capability | 35V DC / 25V AC continuous @ 25 °C (77 °F); 250V peak transient |
| RFI Immunity | Error < 1% of range @ 10 V/m, 27…1000 MHz |
| Physical & Environmental | |
|---|---|
| Dimensions (Module only) | 46 × 94 × 53 mm (1.8 × 3.7 × 2.1 in.) |
| Dimensions (Installed on Terminal Base) | 94 × 94 × 69 mm (3.7 × 3.7 × 2.7 in.) |
| Operating Temperature | -20…+55 °C (-4…+131 °F) |
| Mounting | DIN rail via 1794-TB3 or 1794-TB3S terminal base |
Disclaimer: PLC Exchange is an independent reseller and is not an authorized distributor, affiliate, licensee, partner, or agent of Allen-Bradley / Rockwell Automation. All product information on this page is compiled from publicly-available manufacturer publications, technical data sheets, and catalog sources, each of which remains the copyright of its originating manufacturer. We make no representation or warranty, express or implied, regarding the accuracy, completeness, timeliness, or fitness for any particular purpose of the specifications or descriptions shown — content may contain errors, omissions, or out-of-date information. Product images are the property of their respective manufacturers, trademark owners, and source publications, and are displayed solely for identification purposes under the nominative fair use doctrine; images are representative and may depict a different configuration or catalog variant than the exact product listed. Purchasers should independently verify specifications against the current manufacturer publication before placing an order. All product names, trademarks, service marks, and registered trademarks are the property of their respective owners, and their use does not imply endorsement or affiliation.
Technical Notes for 1794-IR8
- Refer to the manufacturer's installation instructions for proper mounting, wiring, and configuration.
- Ensure compatibility with your existing system architecture before ordering.
- All 1794-IR8 units sold by PLC Exchange are tested and ship in original factory packaging.
- For application-specific questions or system compatibility verification, contact PLC Exchange technical support at [email protected] or 980-202-0882.
Alternative Part Numbers & Names for 1794-IR8
The 1794-IR8 by Allen-Bradley may also be found under the following alternative names, catalog numbers, or common search variations:
- 1794IR8
- Allen Bradley 1794-IR8
- Allen-Bradley 1794-IR8
- 1794 IR8
- 1794/IR8
All variations refer to the same Allen-Bradley product. If you are unsure whether this is the correct part for your application, contact our team for assistance.
Additional information
| Weight | 0.4 lbs |
|---|---|
| Dimensions | 3.7 × 2.1 × 3.7 in |
| warranty | 2.5 Year PLC Exchange Warranty, 30 Days worry-free return from delivery |
| upc | 612598137824 |
| mpn | 1794-IR8 |
| manufacturer | Allen-Bradley |
| condition | Original Packaging |
Dimensions & Weight for 1794-IR8
| Shipping Dimensions | |
|---|---|
| Weight | 0.4 lbs |
| Length | 3.7 in |
| Width | 2.1 in |
| Height | 3.7 in |
| Box Dimensions (L×W×H) | 3.7 × 2.1 × 3.7 in |
Dimensions shown are for the shipping package. For module-level mechanical dimensions, refer to the manufacturer datasheet.
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Frequently Asked Questions
Does the 1794-IR8 include a warranty?
Yes. Every 1794-IR8 sold by PLC Exchange includes a 2.5-year warranty (30 months, full replacement). Details: https://plcexchange.net/warranty-information/
What is the return policy for the 1794-IR8?
PLC Exchange offers a 30-day worry-free return policy. Eligibility and details: https://plcexchange.net/return-policy/
When will my 1794-IR8 ship?
In-stock orders placed before 4 PM ET ship the same business day via free UPS Ground. Expedited options (Next Day Air, 2nd Day Air) are available at checkout.
Who manufactures the 1794-IR8?
The 1794-IR8 is manufactured by Allen-Bradley. PLC Exchange is an independent reseller specializing in Allen-Bradley industrial automation products.
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