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1794-IRT8
The Allen-Bradley 1794-IRT8 is a Flex I/O combination module. This module supports both RTD and Thermocouple sensors. It has Eight (8) channels in Two (2) groups of Four (4) with nominal input ranges of -40…100 mV dc for thermocouples for Thermocouple and 0…325 mV for RTDs for RTD. This module has a resolution of 14 bits.
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Technical specifications for 1794-IRT8
| Manufacturer | Allen Bradley |
|---|---|
| Category | PLCs |
| Product Line | Flex I/O 1794 |
| Part Number | 1794-IRT8 |
| UPC | 612598180226 |
| Weight | 0.25 lbs (0.11 kg) |
| Product Description | Flex IO 8-Channel RTD / Thermocouple Input Module |
| Terminal base | 1794-TB3G, 1794-TB3GS, 1794-TB3GK |
| RTD Sensors supported | 100 ? Pt ? = 0.00385 Euro (-200…+870 °C) 100 ? Pt ? = 0.003916 U.S. (-200…+630 °C) 200 ? Pt ? = 0.00385 Euro (- 200…+630 °C) 500 ? Pt ? = 0.00385 U.S. (-200…+630 °C) 100 ? Nickel ? = 0.00618 (-60…+250 °C) 120 ? Nickel ? = 0.00672 (-60…+250 °C) 200 ? Nickel ? = 0.00618 (-60…+250 °C) 500 ? Nickel ? = 0.00618 (-60…+250 °C) 10 ? Copper ? = 0.00427 (- 200…+260 °C). |
| Thermocouple Sensors supported | Type B: 300…1800 °C (572…3272 °F) Type E: - 270…1000 °C (-454…1832 °F) Type J: -210…1200 °C (- 346…2192 °F) Type K: -270…1372 °C (-454…2502 °F) Type TXK/XK (L):-200…800 °C (-328…1472 °F) Type N: -270…1300 °C (-454…2372 °F) Type R: -50…1768 °C (-58…3214 °F) Type S: -50…1768 °C (-58…3214 °F) Type T: -270…400 °C (-454…752 °F) |
| Nominal input voltage ranges | -40…100 mV DC for thermocouples 0…325 mV for RTDs mV default |
| Resolution | 14 bits |
| Accuracy | 0.05% of full range in mV mode with filtering selected Hardware only = 0.10% of full range in mV mode |
| Data Format | °C (implied decimal point XXX.X) °F (implied decimal point XXX.X) °K (implied decimal point XXX.X) - 32767…+32767 0…65535 0…5000 (? mode) (implied decimal point XXX.X) -4000…+10000 (mV mode) (implied decimal point XXX.XX) |
| ystem Throughput | 7.4 ms - mV 8.0 ms - ? - 2-wire 10.0 ms - ? - 3-wire 10.4 ms - ? - 4-wire 8.0 ms - 2-wire RTD ( °F) 10.4 ms - 4-wire RTD ( °F) 8.8 ms - 2-wire RTD ( °C), ( °K) 10.8 ms - 4- wire RTD ( °C), ( °K) 9.8 ms - 3-wire RTD ( °F) 10.0 ms - 3-wire RTD ( °C), ( °K) 8.0 ms - Thermocouples ( °F) 8.8 ms - Thermocouples ( °C), ( °K)? |
| Mounting | DIN Rail |
| Indicators | 1 green power status indicator 8 red open input indicators |
| Wire Size | Determined by installed terminal base |
| Operating Temperature | 0 to 55 C (32 to 131 F) |
| Storage Temperature | –40…85 °C (–40…185 °F) |
| Vibration | 5g @ 10 to 500 Hz |
| Operating Shock | 30 g |
| Series variations | A and B |
| Nominal voltage | 24 Volts DC |
| Indicator | Power indicator |
| Inputs | 8 |
| Accessories | 2 cold junction compensators |
| Host system | FLEX I/O system |
The 1794-IRT8 module is an Allen-Bradley FLEX I/O millivolt, thermocouple, and RTD module. In a FLEX I/O system, the 1794-IRT8 module is connected to a terminal base and a power adapter. The Allen-Bradley 1794-IRT8 is shipped with 2 cold junction compensators. This cold junction compensator increases the accuracy of the module for Thermocouple mode. 1794-IRT8 module has a nominal voltage rating of 24 Volts DC and 8 analog inputs. It can connect to up to 8 RTD or thermocouple inputs. The front panel of the 1794-IRT8 module has a nameplate that identifies the module, a removable label that the users can customize, a keyswitch position indicator, and LED status indicators.
Compatible RTD sensors for this module are 2-wire, 3-wire and 4-wire RTDs such as 100 ? Pt ? = 0.00385 Euro -200…870 °C (-328…1598 °F) 200 ? Pt ? = 0.00385 Euro -200…400 °C (-328…752 °F) 100 ? Pt ? = 0.003916 U.S. -200…630 °C (-328…1166 °F) 100 ? Pt ? = 0.003916 U.S. -200…400 °C (-328…752 °F) 100 ? Nickel -60…250 °C (-76…482 °F) 200 ? Nickel -60…200 °C (-76…362) °F) 120 ? Nickel -80…320 °C (-112…608 °F) 10 ? Copper -200…260 °C (-328…470 °F). While supported Thermocouple sensors by this module are Thermocouple Type B, E, J, K, TXK/XK(L), N, R, S, and T.
This module has a resolution of 14 bits with selectable data formats such as °C (implied decimal point XXX.X) °F (implied decimal point XXX.X) °K (implied decimal point XXX.X) -32767…32767 0…65535 0…5000 ohms mode (implied decimal point XXX.X) -4000…+10000 millivolt mode (implied decimal point XXX.XX).
The 1794-IRT8 has diagnostic functions embedded including an open circuit detection wherein module reading upscales or defaults to max value when in RTD and Thermocouple mode. It also has an open input detection time of 2 scans, overvoltage capability of 15V DC continuous at 25 °C.
When wiring signal wirings, recommended wires are Thermocouple wires as specified by the TC manufacturer and Belden 8761 for millivolt signal.
| Revision Part # | Also known as | |
|---|---|---|
| 1794-IRT8 Ser A | 1794-IRT8/A, Series A, Rev A | |
| 1794-IRT8 Ser B | 1794-IRT8/B, Series B, Rev B | |
| Don't see your particular revision? Contact us now. | ||
- 1794-1RT8
- 1794-IRTB
- 17941RT8
- 1794IRT8
- 1794IRTB
- 179A-IRT8
- 179AIRT8
- I794-IRT8
- I794IRT8
- I79A-1RTB
- I79A1RTB
Does the 1794-IRT8 come with a warranty?
Yes, the 1794-IRT8 includes a free 2-year DO Supply warranty. You can upgrade to a 3-year warranty at checkout for even more protection.
How many input channels does the 1794-IRT8 have?
The 1794-IRT8 has Eight (8) channels configurable for RTD or Thermocouple input.
What are the supported RTD and Thermocouple sensors by the 1794-IRT8?
Supported sensors are 2-wire, 3-wire and 4-wire RTDs such as 100 ? Pt ? = 0.00385 Euro -200…870 °C (-328…1598 °F) 200 ? Pt ? = 0.00385 Euro -200…400 °C (- 328…752 °F) 100 ? Pt ? = 0.003916 U.S. -200…630 °C (-328…1166 °F) 100 ? Pt ? = 0.003916 U.S. -200…400 °C (-328…752 °F) 100 ? Nickel -60…250 °C (-76…482 °F) 200 ? Nickel -60…200 °C (-76…362) °F) 120 ? Nickel -80…320 °C (-112…608 °F) 10 ? Copper -200…260 °C (-328…470 °F). While supported Thermocouple sensors by this module are Thermocouple Type B, E, J, K, TXK/XK(L), N, R, S, and T.
What is the input resolution of the 1794-IRT8?
The module’s resolution is 14 bits with accuracy of 0.05% of full range in millivolt mode with filtering selected Hardware only = 0.10% of full range in millivolt mode.
The 1794-IRT8 module is an Allen-Bradley FLEX I/O millivolt, thermocouple, and RTD module. The Series B version of the Allen-Bradley The 1794-IRT8 FLEX I/O module can work with grounded thermocouples.