About 1794-IR8

The Allen-Bradley 1794-IR8 is a Flex I/O analog input module, Specifically, this module is a Resistance Temperature Detector (RTD) that is particularly used in temperature applications.

The 1794-IR8 has Eight (8) RTD channels, each channels supporting 1 to 433 ohms input ranges. It is compatible with RTD sensors such as 100? Pt ? = 0.00385 Euro (-200 to +870°C) 100? Pt ? = 0.003916 U.S. (-200 to +630°C) 200? Pt ? = 0.00385 Euro (-200 to +400°C) 500? Pt ? = 0.00385 Euro (-200 to +630°C) 100? Nickel ? = 0.00618 (-60 to +250°C) 120? Nickel ? = 0.00672 (-60 to +250°C) 200? Nickel ? = 0.00618 (-60 to +250°C) 500? Nickel ? = 0.00618 (-60 to +250°C) and 10? Copper ? = 0.00427 (-200 to +260°C).

The 1794-IR8 has an RTD excitation current of 718.36?A.It has a resolution of 16 bits across 435 ohms and accuracy of 0.05% full scale in normal mode and 0.01% full scale in enhanced mode. The module converts the analog data into digital format and stores it to a 16-bit register with data format of 16-bit 2’s complement or offset binary (unipolar). The module has system throughput of 325ms (1 channel scanned), programmable to 28ms 2.6s (8 channels scanned), programmable to 224ms under normal mode and programmable from 56 to 650ms/channel - 650ms (1 channel scanned), 2.925s (8 channels scanned) in enhanced mode.
The 1794-IR8 has a power dissipation of 3.0W maximum @ 31.2V dc and Thermal Dissipation of 10.2 BTU/hr @ 31.2V dc, The module requires a FlexBus current of 20mA.



This module has a 16-bit resolution across 435 Ohms. Its supports RTD sensors such as 100 Ohms Pt α = 0.00385 Euro (-200 to 870 degrees Celsius), 100 Ohms Pt α = 0.003916 U.S. (-200 to 630 degrees Celsius), 200 Ohms Pt α = 0.00385 Euro (-200 to 400 degrees Celsius), 500 Ohms Pt α = 0.00385 Euro (-200 to 630 degrees Celsius), 100 Ohms Nickel α = 0.00618 (-60 to 250 degrees Celsius), 120 Ohms Nickel α = 0.00672 (-60 to 250 degrees Celsius), 200 Ohms Nickel α = 0.00618 (-60 to 250 degrees Celsius), 500 Ohms Nickel α = 0.00618 (-60 to 250 degrees Celsius), and 10 Ohms Copper α = 0.00427 (-200 to 260 degrees Celsius).
The 1794-IR8’s RTD excitation current is 718.36 µAmps. It comes with an accuracy of 0.05% full scale, which is the maximum in the normal mode, and 0.01% full scale, which is typical in the enhanced mode at low humidity without calibration. It has 0 Volts common mode input range and a common mode rejection of -120 dB at 60 Hertz and -100 dB at 50 Hertz with A/D filter cutoff at 10 Hertz. The normal mode rejection ratio of the terminal is -60 dB at 60 Hertz for A/D filter cutoff at 10 Hertz. The 1794-IR8 module also has a channel bandwidth of 0 to 2.62 Hertz or -3 dB, a maximum power dissipation of 3 Watts at 31.2 Volts DC, and a thermal dissipation of 10.2 BTU/hour, also at 31.2 Volts DC. The 1794-IR8’s cold junction compensation range is from -20 to 100 degrees Celsius. The 1794-IR8 has a signal input range of 1 to 433 Ohms and an overvoltage capacity of 35 Volts DC and 25 Volts AC, which is continuous at 25 degrees Celsius. Its isolation voltage has been tested for 60 seconds at 707 Volts DC from the inputs and user power to the logic side. The 1794-IR8 module has a current certification of 140 mA, a current specification of 150 mA at 24 Volts DC, and voltage specifications of 24 Volts DC nominal, 19.2 to 31.2 Volts DC that includes the 5% AC ripple and for ambient temperatures of less than 40 degrees Celsius, and 24 Volts DC maximum for ambient temperatures that are equal to 55 degrees Celsius.

FAQ for 1794-IR8

Question	Answer
1: What is this module’s thermal dissipation?	The 1794-IR8 dissipates around 10.2 BTU of heat hour at 31.2 Volts DC maximum.
2: What are the module locations of 1794-IR8?	The module locations of 1794-IR8 are 1794-TB2, 1794-TB3, 1794-TB3T Terminal Base Units.
3: How many indicators does 1794-IR8 have?	The 1794-IR8 has 1 red/green status indicator.
4: Can this module be purchased with a warranty?	Yes, the 1794-IR8 comes with a free one-year warranty from DO Supply, Inc.
5: Where can I send the 1794-IR8 to be repaired?	DO Supply, Inc. offers a variety of repair services for the 1794-IR8.
6: What is this module’s power dissipation?	This module has a maximum power dissipation of 3 Watts at 31.2 Volts DC.
7: What are the supported RTD sensors by the 1794-IR8?	Supported RTD sensors are 100? Pt ? = 0.00385 Euro (-200 to +870°C) 100? Pt ? = 0.003916 U.S. (-200 to +630°C) 200? Pt ? = 0.00385 Euro (-200 to +400°C) 500? Pt ? = 0.00385 Euro (-200 to +630°C) 100? Nickel ? = 0.00618 (-60 to +250°C) 120? Nickel ? = 0.00672 (-60 to +250°C) 200? Nickel ? = 0.00618 (-60 to +250°C) 500? Nickel ? = 0.00618 (-60 to +250°C) and 10? Copper ? = 0.00427 (-200 to +260°C).
8: What is the resolution and supported data format of the 1794-IR8?	The module’s resolution is 16 bits across 435 ohms while data format is 16-bit 2’s complement or offset binary (unipolar).
9: What are the compatible terminal bases for use with the 1794-IR8?	Applicable terminal base units are 1794-TB2, -TB3, -TB3S, -TB3T and -TB3TS.

Repair Services for 1794-IR8

Type	Lead Time	Price	Action
Repair Service	2-4 weeks	$728.18	Add to Cart

Our highly skilled technicians can repair your 1794-IR8. All of our repairs come with a 1 Year DO Supply Warranty. Please contact us for additional information about our repair process.

Revisions for 1794-IR8

Please refer to the manual for more information about the 1794-IR8 such as the wiring diagrams, data sheets, firmware information and migration or obsolescence details.

Revision Part #	Also Known as	Availability
1794-IR8 Ser A	1794-IR8/A, Series A, Rev A	Request Quote

Reviews for 1794-IR8

Product Review

"The 1794-IR8 is an analog input module that is especially designed to interface Resistance Temperature Detectors (RTD) sensors. This module has Eight (8) RTD channels compatible for a wide variety of RTD sensors. It supports 2-wire or 3-wire sensors. This module eliminates the need of transmitter for interfacing temperature applications as it allows an RTD sensor to be directly wired to any of the module’s channels. " -DO Supply Tech

Dimensions For 1794-IR8

Dimensions For 1794-IR8

Resolutions For 1794-IR8