The Allen-Bradley 1794-IRT8 is an 8-channel thermocouple, RTD, and millivolt input module for the FLEX I/O system. The module features 14-bit input resolution, wire-off/overrange/underrange detection, and cold-junction compensation via external compensators (1794-CJC2) for thermocouple accuracy.
Item No :
1794-IRT8Order(MOQ) :
1 PiecePayment :
EXWProduct Origin :
Singapore/ChinaShipping Port :
WuhanLead Time :
3~5 daysWeight :
5kg| Specification | Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Model | 1794-IRT8 |
| Product Family | FLEX I/O (1794 Series) |
| Product Type | Thermocouple / RTD / Millivolt Input Module |
| Input Channels | 8 (non-isolated, analog multiplexed) |
| Input Resolution | 14 bits |
| Default Input Spans | –40.00 mV to +100.00 mV; 0.0 to 500.0 Ω |
| Supported Thermocouple Types | B, E, J, K, N, R, S, T, TXK/XK(L) |
| Supported RTD Types | 100Ω Pt 385/3916, 200Ω Pt 385/3916, 100Ω Ni 618, 120Ω Ni 672, 200Ω Ni 618, 10Ω Cu 427 |
| RTD Wiring | 2-wire, 3-wire, 4-wire |
| Accuracy (mV mode) | 0.05% full range with filtering; 0.10% hardware only |
| Common Mode Rejection | –80 dB @ 5V peak-to-peak, 50–60 Hz |
| Common Mode Input Range | Series A: ±4V; Series B: ±15V |
| System Throughput | 7.4 ms (mV); 8.0–10.8 ms (RTD, depending on wire configuration) |
| Power Supply | 24V DC (module does not receive backplane power; external 24V required) |
| Power Dissipation | 3 W max @ 31.2V DC |
| Terminal Base | 1794-TB3G or 1794-TB3GS (recommended) |
| Cold Junction Compensator | 1794-CJC2 (two shipped with new module) |
| Operating Temperature | -20°C to +55°C (-4°F to +131°F) |
| Dimensions (H x W x D) | 49 x 94 x 53 mm |
| Weight | Approx. 0.4 kg |
| Hot Swap (RIUP) | Supported |
| Certifications | CE, UL, CSA, ATEX, IECEx, RINA, ABS, CCC |
| Lifecycle Status | Discontinued / EOL – New Surplus available |
| Model | Description | Typical Application |
|---|---|---|
| 1794-IRT8 (this model) | 8-ch thermocouple/RTD/mV input, 14-bit | FLEX I/O temperature acquisition (discontinued) |
| 1794-IRT8XT | Extended temperature version (-20 to +70°C), conformal coated | Harsh environments requiring wide temperature |
| 1794-IRT8K | Conformal-coated version of 1794-IRT8 | Corrosive or humid environments |
| 1794-IT8 | 8-ch thermocouple/mV input (earlier generation) | Legacy thermocouple-only applications |
| 1794-IR8 | 8-ch RTD input module | RTD-only temperature measurement |
| 5094-IRT8 | FLEX 5000 8-ch thermocouple/RTD/mV input | Recommended migration path for new installations |
| 1794-TB3G | Terminal base for 1794-IRT8 | Required mounting base |
| 1794-CJC2 | Cold-junction compensator | Required for thermocouple accuracy |
Q1: What is the primary function of the 1794-IRT8?
It is an 8-channel thermocouple, RTD, and millivolt input module for the FLEX I/O system. It accepts inputs from a wide variety of temperature sensors (thermocouples and RTDs) and millivolt sources, converting them to digital data for the PLC controller. It is designed for high-speed, high-accuracy temperature measurement in distributed control applications.
Q2: Does the 1794-IRT8 require an external power supply?
Yes. The module does not receive primary operational power from the backplane. External 24V DC power must be applied to the terminal base before operation. If power is not applied, the module position will appear to the adapter as an empty slot.
Q3: What is the difference between Series A and Series B of the 1794-IRT8?
The Series B version provides the capability to work with grounded thermocouples and has an expanded common mode input range of ±15V (compared to ±4V for Series A). Series B is the recommended version for most applications.
Q4: What are the common applications for the 1794-IRT8?
It is widely used for temperature monitoring in process industries, including furnace/oven temperature control, boiler monitoring, heat treating, and any application requiring direct thermocouple or RTD interface to a PLC via FLEX I/O. It is also suitable for millivolt signal acquisition in test and measurement applications.
The Allen-Bradley 1794-OE4 is a 4-channel analog output module for the FLEX I/O system. It provides 4 single-ended, non-isolated outputs with software-selectable voltage (±10V, 0–10V) or current (0–20 mA, 4–20 mA) ranges, offering 12-bit plus sign resolution and 1.024 ms conversion rate for all channels.
The Allen-Bradley 1794-IRT8 is an 8-channel thermocouple, RTD, and millivolt input module for the FLEX I/O system. The module features 14-bit input resolution, wire-off/overrange/underrange detection, and cold-junction compensation via external compensators (1794-CJC2) for thermocouple accuracy.
The Allen-Bradley 1794-OF4I is a 4-channel isolated analog output module for the FLEX I/O system. The module supports Removal and Insertion Under Power (RIUP) for hot-swap maintenance and includes open-wire detection and field power monitoring diagnostics.
The Allen-Bradley 1794-IF8IH is an 8-channel isolated HART analog input module for the FLEX I/O system. It provides 8 individually isolated current inputs (0–20 mA or 4–20 mA) with 16-bit resolution and HART 5/6/7 pass-through communication, enabling remote configuration, calibration, and diagnostics of HART-enabled transmitters without additional multiplexers.
The Allen-Bradley 1794-OE8H is an 8-channel HART analog output module for the FLEX I/O system, designed for process control applications requiring direct communication with smart field devices. It provides 0–20 mA or 4–20 mA current outputs on each channel while simultaneously enabling HART digital communication over the same two wires, eliminating the need for external HART multiplexers or additional wiring.
The Allen-Bradley 1794-IT8 is an 8-channel thermocouple/millivolt input module for the FLEX I/O system, designed for direct interfacing with a wide variety of thermocouple sensors and low-level millivolt sources. The module includes cold-junction compensation and on-board scaling, simplifying programming and eliminating the need to scale data in the user program.
The Allen-Bradley 2711P-RDB10C is a PanelView Plus 1000 series display module designed as a replacement or spare for PanelView Plus and PanelView Plus 6 1000 operator terminals. It features a 10.4-inch color TFT display with 640 x 480 pixel resolution, a keypad and analog resistive touchscreen for operator input, and a CCFL backlight rated for 50,000 hours.
The Allen-Bradley 2711P-T15C4D9 is a PanelView Plus 6 1500 operator terminal featuring a 15.0-inch color active-matrix TFT touchscreen with 1024 x 768 resolution and 18-bit color graphics. It includes 512 MB Flash memory and 512 MB RAM, along with embedded Ethernet, RS-232, and two USB host ports for flexible connectivity.
Scan to Wechat :
Scan to WhatsApp :
