The Allen-Bradley 1794-IR8 is an 8-channel RTD input module from the FLEX I/O system, designed for high-precision temperature measurement in industrial automation. It accepts 2, 3, or 4-wire RTD sensors including Pt100, Pt200, Pt500, Ni100, Ni120, Ni200, Ni500, and Cu10, with 16-bit resolution and industry-leading accuracy.
Item No :
1794-IR8Order(MOQ) :
1 PiecePayment :
EXWProduct Origin :
Singapore.Shipping Port :
WuhanLead Time :
3~5 daysWeight :
5kg| Specification | Description |
|---|---|
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1794-IR8 |
| Product Family | FLEX I/O |
| Product Type | RTD Input Module |
| Input Channels | 8 (2 groups of 4, independently configurable) |
| Input Resolution | 16 bits across 435 Ω |
| RTD Types Supported | 100Ω Pt 385/3916, 200Ω Pt 385, 500Ω Pt 385, 100/200/500Ω Ni 618, 120Ω Ni 672, 10Ω Cu 427 |
| Wiring Configuration | 2, 3, or 4-wire RTD |
| Accuracy (Normal Mode) | 0.05% Full Scale max |
| Accuracy (Enhanced Mode) | 0.01% Full Scale typical |
| Temperature Range | -200°C to +870°C (dependent on RTD type) |
| Common Mode Rejection | -120 dB @ 60 Hz |
| Channel Bandwidth | DC to 2.62 Hz (-3 dB) |
| Isolation | Between user side and system side |
| Power Supply | 24V DC (external, via terminal base) |
| FlexBus Current | 20 mA |
| External DC Current | 140 mA @ 24V DC |
| Power Dissipation | 3W @ 31.2V DC |
| Operating Temperature | -20°C to +55°C (-4°F to +131°F) |
| Dimensions (H x W x D) | 46 x 94 x 53 mm (module only); 94 x 94 x 69 mm (installed) |
| Terminal Base Compatibility | 1794-TB2, TB3, TB3S, TB3T, TB3TS |
| Configuration Software | RSLogix 500 / Studio 5000 |
| Lifecycle Status | Active / Mature |
| Model | Description | Typical Application |
|---|---|---|
| 1794-IR8 (this model) | 8-channel RTD input module | Temperature measurement with RTD sensors |
| 1794-IRT8 | 8-channel thermocouple/RTD/mV input module | Multi-sensor temperature measurement |
| 1794-IRT8XT | Extreme environment version (-20°C to +70°C) | Harsh industrial environments |
| 1794-IE8 | 8-channel analog current/voltage input module | Standard analog signal measurement |
| 1794-IT8 | 8-channel thermocouple input module | High-temperature thermocouple measurement |
| 5094-IY8 | Replacement module for 1794-IR8 | Migration path for new installations |
| 1794-TB3G | Terminal base for 1794-IR8 | Required mounting base for field wiring |
Q1: What RTD sensor types does the 1794-IR8 support?
The module supports a wide range of RTD types including 100Ω Pt 385 (Euro), 100Ω Pt 3916 (US), 200Ω Pt 385, 500Ω Pt 385, 100Ω Ni 618, 200Ω Ni 618, 500Ω Ni 618, 120Ω Ni 672, and 10Ω Cu 427 . Each channel can be independently configured for different sensor types .
Q2: What is the difference between normal mode and enhanced mode?
Normal mode provides 0.05% full-scale accuracy with faster throughput (28-325 ms/channel). Enhanced mode improves accuracy to 0.01% typical and reduces gain drift to 10 ppm/°C, but at the cost of reduced throughput (56-650 ms/channel) . Enhanced mode is selected via a checkbox in the module configuration .
Q3: What are common causes of incorrect readings on the 1794-IR8?
Common causes include:
Incorrect wiring configuration: For 2-wire resistance measurement, do not jumper the negative terminal to COM—this creates a parallel path that interferes with readings
Unconfigured module: A flashing green LED indicates the module is powered but not configured; a configuration block must be sent via BTW/BTR or COP instructions
Wrong terminal base: Ensure the correct terminal base (1794-TB3/TB3S) is used with proper shield landing
Q4: How do I configure the module for RTD measurement?
Configuration is performed using RSLogix 500 or Studio 5000 software. Key parameters include:
Sensor Type: Select specific RTD type (e.g., 100Ω Pt 385)
Data Format: Choose °C, °F, °K, or raw counts
Notch Filter: Select appropriate filter frequency (10 Hz, 50 Hz, 60 Hz, etc.) for noise rejection
RTD Loop Compensation: Select "Use Calibrated Values" for best accuracy, or specify 5/10/15Ω compensation
Q5: What is the maximum distance for RTD wiring?
The 1794-IR8 supports 4-wire RTD connections for high-precision, long-distance measurements. Four-wire configuration eliminates lead resistance errors, making it suitable for remote temperature monitoring. For 3-wire RTDs, the module automatically compensates for lead resistance.
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