Catalogs > Automation Systems Catalog > I/O > In-Cabinet Distributed I/O > 1794 FLEX I/O
1794 FLEX I/O
| Introduction |  |
Product Design | |
Typical Configurations | |
Specifications | |
I/O Communication Adapters | |
Digital I/O Modules | |
| Analog, Thermocouple, and RTD I/O Modules | |
Specialty I/O Modules | |
HART Smart Instrumentation | |
Terminal Bases and Accessories | |
Power Supplies | |
Encompass Partner Products | |
- Individually configurable channels allow the module to be used with a variety of sensors.
- Selectable input filters on many modules allow you to select from several different filter frequencies for each channel that best meets the performance needs of your application. Lower filter settings provide greater noise rejection and resolution. Higher filter settings provide faster performance. Note: Isolated analog modules have four filter selections; the thermocouple module has ten; and the combined RTD/thermocouple module has eight.
- Single-ended or differential inputs depending on module. Analog modules have single-ended inputs while isolated analog and temperature modules have differential inputs. Single-ended voltage sensors reduce costs. Differential inputs are typically more noise immune.
- On-board scaling is performed by the temperature modules and is user-configurable for either °C, °F, or mV. This eliminates the need to scale the data in the user program.
- Internal calibration is performed in the analog modules (1794-IE8, 1794-OE4, and 1794-IE4XOE2). User calibration is required for isolated analog and temperature modules. All modules come factory calibrated.
- Conformal coated (K) versions of standard modules.
- Extreme environment (XT) versions of standard modules.
- HART (Highway Addressable Remote Transmitter) analog modules (1794-IE8H and 1794-OE8H) combine analog and HART connectivity in one module. No external hardware is required to access the HART signal. These modules support FDT-compatible asset management software to HART field devices. Also, HART commands can be transmitted as unscheduled messages.
FLEX Analog Input Modules
- Each channel of the three 1794-IE8 modules and three 1794-IF4I modules is individually configurable for the desired input range. The 1794-IE12 channels are configurable in pairs.
- Use with 2-, 3-, and 4-wire input sensor field devices.
- Input data format:
- 1794-IE8, - IE8K, -IE8XT:
16-bit 2’s complement, left-justified
- 1794-IE12:16-bit 2's complement
- 1794-IF4I, -IF4IXT, -IF4ICFXT:
2’s complement
2’s complement percent
binary
offset binary
- 1794-IE8, - IE8K, -IE8XT:
| Cat. No.♠ | Number of Inputs | Signal Range | Input Conversion Rate | Input Resolution | Absolute Accuracy | Step Response to 63% of FS | External DC Supply Current, Nom. | Power Dissipation, Max. | Terminal Base Unit |
| 1794-IE8 1794-IE8K∆ |
8 single-ended inputs | 4…20 mA 0…20 mA ±10V 0…10V |
256 ms all channels | 12 bits - Unipolar, 11 bits + sign - Bipolar 5.13 mA/Cnt 2.56 mV/Cnt - Unipolar 5.13 mV/Cnt - Bipolar |
Current Input: 0.20% Full Scale at 25 °C Voltage Input: 0.20% Full Scale at 25 °C⋆ |
Current Input: 18.2 ms Voltage Input: 9.4 ms |
60 mA at 24V DC | 3.0 W at 31.2V DC | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS |
| 1794-IE8XT | 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS | ||||||||
| 1794-IF4I | 4 Isolated inputs | 4…20 mA 0…20 mA ±20 mA ±10V 0…10V ±5V 0…5V |
2.5/5.0/7.5 ms all channels | 16 bits - Unipolar, 15 bits + sign - Bipolar 0.320 mA/Cnt - Unipolar 0.640 mA/Cnt - Bipolar 0.156 mV/Cnt - Unipolar 0.313 mV/Cnt - Bipolar |
Current Input: 0.1% Full Scale at 25 °C Voltage Input: 0.1% Full Scale at 25 °C⋆ |
Current or Voltage Input: 1200 Hz conversion rate = 0.6 ms 600 Hz conversion rate = 6.7 ms 300 Hz conversion rate = 13.4 ms 150 Hz conversion rate = 26.7 ms |
80 mA at 24V DC | 2.0 W at 31.2V DC | 1794-TB2, 1794-TB 3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN |
| 1794-IF4IXT | |||||||||
| 1794-IF4ICFXT | |||||||||
| 1794-IE12 | 12 single-ended Non-isolated inputs | 4…20 mA (user configurable) 0…20 mA (user configurable) |
8.0 ms all channels | 320 mV/cnt 0.641 mA/cnt |
Current Input: 0.1% Full Scale at 25 °C Voltage Input: 0.1% Full Scale at 25 °C⋆ |
Current or Voltage Input: 1.3 s (0.09 s with Quick Step) | 30 mA at 24V DC; 45 mA at 10.0V DC | 1.2 W at 31.2V DC; 1.1 W at 24V DC; 0.9 W at 10.0V DC | 1794-TB3G or 1794-TB3GS |
| ♠ Catalog numbers ending in (K) = Conformal Coated, (XT) = extreme environment. ∆ Each module's channel is individually selectable. ⋆ Includes offset, gain, non-linearity, and repeatability error terms. |
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FLEX Thermocouple and RTD Input Modules
| Cat. No.♠ | Number of Inputs | Input Signal Range | Input Resolution | External DC Supply Current, Nom. | Power Dissipation, Max. | Terminal Base Unit |
| 1794-IR8 | 8 RTD, Strain Gauge | 1…433 W | 16 bits across 435 W | 140 mA at 24V DC | 3 W at 31.2V DC | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBKD |
| The 1794-IR8 is a temperature-measuring module that accepts 2-, 3-, and 4-wire RTDs. Use the 1794-IR8 in applications where channel fast-update rate is not required. If you need channel fast-update rates, use the 1794-IRT8 module. | ||||||
| 1794-IRT8 1794-IRT8K 1794-IRT8XT |
8 RTD, Thermocouple, Millivolt, Strain Gauge | -40…100 mV DC for thermocouples 0…325 mV for RTDs |
14 bits | 95 mA at 24V DC | 3.0 W at 31.2V DC | 1794-TB3G, 1794-TB3GS, 1794-TB3GK |
| The 1794-IRT8 and -IRT8K (conformal coated version) are high-speed, high-accuracy temperature/mV measuring module that accepts thermocouple inputs, 2-, 3-, and 4-wire RTD inputs, and mV source inputs. The 1794-IRT8 also offers wire-off, over-range, and under-range detection. Use cold-junction compensators (1794-CJC2) in thermocouple mode. Two cold-junction compensators are shipped with the these modules. The 1794-IRT8XT is the extreme environment version, rated for operation at temperatures of -20…70 °C (-4…158 °F). |
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| 1794-IT8 | 8 Thermocouple, Millivolt | ±76.5 mV | 16 bits (2.384 mV typical) | 150 mA at 24V DC | 3 W at 31.2V DC | 1794-TB3T, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3TS |
| The 1794-IT8 is a temperature/mV measuring module that accepts inputs from a variety of thermocouples and from the mV source in the range of ±76.5 mV. Use cold-junction compensators (1794-CJC2) in thermocouple mode. Two cold-junction compensators are shipped with the 1794-IT8. | ||||||
| ♠ Catalog numbers ending in (K) = Conformal Coated, (XT) = extreme environment. |
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Thermocouple and RTD Modules—Sensors Supported
| 1794-IR8 | 1794-IRT8K, 1794-IRT8XT | 1794-IT8 |
| RTD | ||
| Resistance: 100 W Pt m = 0.00385 Euro (-200…+870 °C) 100 W Pt m = 0.003916 U.S. (-200…+630 °C) 200 W Pt m = 0.00385 Euro (-200…+630 °C) 500 W Pt m = 0.00385 U.S. (-200…+630 °C) 100 W Nickel m = 0.00618 (-60…+250 °C) 120 W Nickel m = 0.00672 (-60…+250 °C) 200 W Nickel m = 0.00618 (-60…+250 °C) 500 W Nickel m = 0.00618 (-60…+250 °C) 10 W Copper m = 0.00427 (-200…+260 °C) |
Resistance: 100 W Pt m = 0.00385 Euro (-200…+870 °C) 100 W Pt m = 0.003916 U.S. (-200…+630 °C) 200 W Pt m = 0.00385 Euro (-200…+400 °C) 200 W Pt m = 0.003916 U.S. (-200…+400 °C) 100 W Nickel m = 0.00618 (-60…+250 °C) 120 W Nickel m = 0.00672 (-80…+320 °C) 200 W Nickel m = 0.00618 (-60…+200 °C) 10 W Copper m = 0.00427 (-200…+260 °C) |
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| Thermocouple | ||
| — | 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) |
Type B: 300…1800 °C (572…3272 °F) Type C: 0…2315 °C (32…4199 °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 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) Type TXK/XK (L): -200…800 °C (-328…1472 °F) |
FLEX Analog Combination I/O Modules
- Input data format:
- 1794-IE4XOE2, -IE4XOE2XT:
16-bit 2's complement, left-justified
- 1794-IE8XOE4:
16-bit, 2's complement
- 1794-IF2XOF2I, -IF2XOF2IXT:
2's complement
2's complement %
binary
offset binary
- 1794-IE4XOE2, -IE4XOE2XT:
- Output data format:
- 1794-IE4XOE2, -IE4XOE2XT:
16-bit 2's complement, left justified
- 1794-IE8XOE4:
16-bit 2's complement
- 1794-IF2XOF2I, -IF2XOF2IXT:
2's complement
2's complement %
binary
offset
- 1794-IE4XOE2, -IE4XOE2XT:
| Cat. No.♠ | Number of Inputs/Outputs | Signal Range | Conversion Rate | Input Resolution | Absolute Accuracy | Step Response to 63% of FS | External DC Supply Current, Nom. | Power Dissipation, Max. | Terminal Base Unit |
| 1794-IE4XOE2 | 4 inputs/2 single-ended outputs | 4…20 mA 0…20 mA ±10V 0…10V |
Inputs: 256 ms all channels Outputs: 1.024 ms all channels |
12 bits - Unipolar, 11 bits + sign - Bipolar 5.13 mA/Cnt 2.56 mV/Cnt - Unipolar 5.13 mV/Cnt - Bipolar |
Current Input: 0.20% Full Scale at 25 °C Voltage Input: 0.20% Full Scale at 25 °C Current Output: 0.425% Full Scale at 25 °C Voltage Output: 0.133% Full Scale at 25 °C⋆ |
Current Input: 18.2 ms Voltage Input: 9.4 ms |
70 mA @ 24V DC | 4.0 W at 31.2V DC | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS |
| 1794-IE4XOE2XT | Inputs: 256 ms all channels | 164 mA @ 10.5V DC | 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS | ||||||
| 1794-IE8XOE4 | 8 single-ended inputs/4 outputs | 4…20 mA (user configurable) 0…20 mA (user configurable) |
Inputs: 8.0 ms all channels Outputs: DAC |
320 mV/cnt 0.641 mΑ/cnt |
Current Input or Output: 0.1% Full Scale at 25 °C Voltage Input or Output: 0.1% Full Scale at 25 °C⋆ |
Current or Voltage Input: 1.3 s (0.09 s with Quick Step) | 140 mA at 24V DC; 280 mA at 10.0V DC | 3.0 W at 31.2V DC; 2.3 W at 24V DC; 2.0 W at 10.0V DC | 1794-TB3G or 1794-TB3GS |
| 1794-IF2XOF2I | 2 isolated inputs/2 outputs | 4…20 mA 0…20 mA ±20 mA ±10V 0…10V ±5V 0…5V |
Inputs: 2.5/5.0/7.5 ms all channels Outputs: 2.5/5.0 ms |
16 bits - unipolar; 15 bits plus sign - bipolar 0.156 mV/cnt unipolar; 0313 mV/cnt bipolar 0.320 mA/cnt unipolar; 0.640 mA/cnt bipolar |
Current Terminal: 0.1% Full Scale at 25 °C Voltage Terminal: 0.1% Full Scale at 25 °C |
Current or Voltage Terminal: 1200 Hz conversion rate = 0.6 ms 600 Hz conversion rate = 6.7 ms 300 Hz conversion rate = 13.4 ms 150 Hz conversion rate = 26.7 ms |
150 mA at 24V DC | 3.3 W at 31.2V DC | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN |
| 1794-IF2XOF2IXT | Current Terminal: 0.1% Full Scale at 25 °C Voltage Terminalt: 0.1% Full Scale at 25 °C |
2.0 W at 31.2V DC | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN | ||||||
| ♠ Catalog numbers ending in: (XT) = extreme environment. ⋆ Includes offset, gain, non-linearity, and repeatability error terms. |
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FLEX Analog Output Modules
- Each channel of the three 1794-OE4 modules and two 1794-OF4I modules is individually configurable for the desired range. The 1794-OE12 channels are configurable in pairs.
- Output data format:
- 1794-OE4, -OE4K, -OE4XT:
16-bit 2’s complement, left-justified
- 1794-OE12:
16-bit 2's complement
- 1794-OF4I, -OF4IXT:
2’s complement
2’s complement percent
binary
offset binary
- 1794-OE4, -OE4K, -OE4XT:
| Cat. No.♠ | Number of Outputs | Signal Range | Output Conversion Rate | Output Resolution | Absolute Accuracy | Step Response to 63% of FS, Output | External DC Supply Current, Nom. | Power Dissipation, Max. | Terminal Base Unit |
| 1794-OE4 1794-OE4K |
4 single-ended outputs | 4…20 mA 0…20 mA ±10V 0…10V |
1.024 ms all channels | 12 bits + sign 5.13 mA/Cnt 2.56 mV/Cnt |
Current Output: 0.425% Full Scale at 25 °C Voltage Output: 0.133% Full Scale at 25 °C |
Voltage Output: 24 ms | 70 mA at 24V DC⋆ | 4.5 W at 31.2V DC | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN |
| 1794-OE4XT | 4 single-ended outputs | 4…20 mA 0…20 mA ±10V 0…10V |
— | 12 bits + sign 0.156 mV/cnt 0.320 mΑ/cnt |
Voltage terminal - 0.133% Full Scale at 25 °C Current terminal - 0.425% Full Scale at 25 °C |
24 ms | 180 mA at 10.5V DC | 4.5 W at 31.2V DC | 1794-TB2, -TB3, -TB3S, -TB3T, -TB3TS, and -TBN |
| 1794-OE12 | 12 single-ended outputs | 4…20 mA 0…20 mA |
— | 320 mV/cnt 0.641 mΑ/cnt |
Current Output: 0.1% Full Scale at 25 °C Voltage Output: 0.1% Full Scale at 25 °C |
~70% 1st convert; 96% 2nd convert; 100% 3rd convert | 320 mA at 24V DC 720 mA at 10.0V DC |
4.0 W at 31.2V DC; 4.3 W at 24V DC; 4.0 W at 10.0V DC | 1794-TB3G or 1794-TB3GS |
| 1794-OF4I | 4 Isolated outputs | 4…20 mA 0…20 mA ±10V 0…10V ±5V 0…5V |
2.5/5.0 ms | 15 bits + sign 0.656 mA/Cnt 0.320 mV/Cnt |
Current Output: 0.1% Full Scale at 25 °C Voltage Output: 0.1% Full Scale at 25 °C |
Current or Voltage Output: < 25 ms | 210 mA at 24V DC | 4.7 W at 31.2V DC | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN |
| 1794-OF4IXT | 2.0 W at 31.2V DC | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN | |||||||
| ♠ Catalog numbers ending in (K) = Conformal Coated, (XT) = extreme environment. ⋆ Not including outputs. |
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