1794-IR8 - Analog Input Module

Description

Description: The Allen-Bradley 1794-IR8 Flex I/O RTD Module has 8 Channels Inputs, a 1 to 433 ohms Nominal Input Ranges, and a 16 bits Resolution. It also operates with a -60db at 60 Hertz Normal Mode Noise Rejection and a 0-2.62 Hertz Channel Bandwidth.

Technical Specifications for 1794-IR8

Manufacturer	Rockwell Automation
Brand	Allen-Bradley
System Throughput:	Normal Mode: Programmable from 28ms/channel to 325ms/channel 325ms (1 channel scanned) 2.6s (8 channels scanned) - default Enhanced Mode: Programmable from 56ms/channel to 650ms/channel 650ms (1 channel scanned) - default 2.925s (8 channels scanned)
Data Format:	16-bit 2's complement or offset binary (unipolar)
Accuracy:	Without calibration, at low humidity: Normal mode: 0.05% full scale (max) Enh. mode: 0.01% full scale (typical)
RTD Excitation Current:	718.36?A
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).
Terminal base:	1794-TB2, 1794-TB3 and 1794-TB3T
Number of Inputs:	8
Product Description:	Flex IO 8-Channel RTD Input Module
Mounting:	DIN Rail
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)
Resolution	16 bits across 435 ohms

Vibration:	5g @ 10 to 500 Hz
Operating Shock:	30 g
Part Number/Catalog No.	1794-IR8
Product Type	Flex I/O RTD Module
Inputs	8 Channels
Nominal Input Ranges	1 to 433 ohms
Isolation Voltage	850 Volts DC
Normal Mode Noise Rejection	-60 DB at 60 Hertz
Channel Bandwidth	0 to 2.62 Hertz
Normal Mode System Throughput	325 milliseconds
Flexbus Current	20mA
Power Dissipation	3 Watts at 31.2 Volts DC maximum
Thermal Dissipation	10.2 BTU/hour at 31.2 Volts DC maximum

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.

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