Rockwell Automation 1762-IT4 Thermocouple/mV Input Module User Manual
Page 17
MicroLogix 1200 Thermocouple/mV Input Module 17
Publication 1762-IN013B-EN-P - June 2013
Input Specifications
Specification
1762-IT4
Number of Inputs
4 input channels plus a CJC sensor
Resolution
15 bits plus sign
Bus Current Draw, max
40 mA @ 5V DC
50 mA @ 24V DC
Heat Dissipation
1.5 Total Watts (The Watts per point, plus the minimum Watts, with all
points energized.)
Converter Type
Delta Sigma
Input Filtering
Programmable notch filter with 10, 50, 60, 250, 500 and 1k Hz
frequencies.
Channel Update Time
Input filter and configuration dependent.
See
“Channel Update Time” on page 19
Rated Working Voltage
(1)
30V AC/30V DC
Common Mode Voltage Range
(2)
±10V DC maximum per channel
Common Mode Rejection
115 dB (minimum) @ 50 Hz (with 10 Hz or 50 Hz filter)
115 dB (minimum) @ 60 Hz (with 10 Hz or 60 Hz filter)
Normal Mode Rejection Ratio
85 dB (minimum) @ 50 Hz (with 10 Hz or 50 Hz filter)
85 dB (minimum) @ 60 Hz (with 10 Hz or 60 Hz filter)
Cable Impedance, max
25
Ω
Input Impedance
>10 M
Ω
Open-circuit Detection Time (max.)
7 ms…1.515 seconds
(4)
Calibration
The module performs autocalibration upon power-up and whenever a
channel is enabled. You can also program the module to calibrate every
five minutes using the Enable/Disable Cyclic Calibration bit.
Repeatability
(3)
See
Maximum Overload at Input
Terminals
±35V DC continuous
(5)
Module Error over Full Temperature
Range
(0…55°C [+32…131°F])
See
CJC Accuracy
±1.3 °C (±2.34 °F)
Power Supply Distance Rating
6 (The module may not be more than 6 modules away from the system
power supply.)
Input Group to Bus Isolation
720V DC for 1 minute (qualification)
30V AC/30V DC working voltage (IEC Class 2 reinforced insulation)
Input Channel Configuration
via configuration software screen or the user program (by writing a
unique bit pattern into the module’s configuration file).
Module OK LED
On: module has power, has passed internal diagnostics, and is
communicating over the bus.
Off: Any of the above is not true.
Channel Diagnostics
Over- or under-range and open-circuit by bit reporting