Publication 1794-6.5.12 - November 1997
A-2 Specifications
System Throughput (8 channels scanned) For maximum throughput short circuit all unused channels.
4ms – millivolt
6.0ms – ohms – 2- and 4-wire RTD
10.0ms – ohms – 3-wire RTD
6.4ms – 2- and 4-wire RTD (°F)
6.8ms – 2- and 4-wire RTD (°C), (°K)
10.2ms – 3-wire RTD (°F)
10.6ms – 3-wire RTD (°C), (°K)
5.6ms – Thermocouples (°F)
6.0ms – Thermocouples (°C), (°K)
Open Circuit Detection Defaults to maximum value
Open Input Detection Time 0 to 6.5s depending on input type and mode selected
1.3s – Thermocouple
3.8s – 2- and 4-wire RTD
6.5s – 3-wire RTD
Overvoltage Capability 7V dc continuous @ 25°C
RFI Immunity Error of less than 1% of range at 10V/M
27 to 1000MHz
Overall Drift with Temperature 150ppm/°C of span (maximum)
Cold Junction Compensation range 0 to 70°C
Cold Junction Compensator A-B Part Number 969424-02
Indicators 1 green power status indicator
Flexbus Current 40mA
Power Dissipation 3W maximum @ 31.2V dc
Thermal Dissipation Maximum 10.2 BTU/hr @ 31.2V dc
Keyswitch Position 3
External dc Power
Supply Voltage
Voltage Range
Supply Current
24V dc nominal
19.2 to 31.2V dc (includes 5% ac ripple)
85mA @ 24V dc
General Specifications
Dimensions Inches
(Millimeters)
1.8H × 3.7W × 2.1D
(45.7 × 94.0 × 53.3)
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Shock Operating
Non-operating
Vibration
0 to 55°C (32 to 131°F)
–40 to 85°C (–40 to 185°F)
5 to 95% noncondensing (operating)
5 to 80% noncondensing (nonoperating)
30 g peak acceleration, 11(±1)ms pulse width
50 g peak acceleration, 11(±1)ms pulse width
Tested 5 g @ 10-500Hz per IEC 68-2-6
Conductors Thermocouple
Millivolt
Category
Use appropriate shielded thermocouple wire
1
Belden 8761
2
2
Agency Certification
(when product is marked)
•CSA certified
• CSA Class I, Division 2
Groups A, B, C, D certified
• UL listed
• CE marked for all applicable directives
User Manual Publication 1794-6.5.12
1 Refer to thermocouple manufacturer for proper thermocouple extension.
2 Use this conductor category information for planning conductor routing. Refer to publication 1770-4.1, “Industrial
Automation Wiring and Grounding Guidelines for Noise Immunity.”
Specifications – 1794-IRT8 Thermocouple/RTD/mV Input Module
Allen-Bradley PLCs
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