Rockwell Automation 1762-IT4 Thermocouple/mV Input Module - Manual (Page 78)

Publication 1762-UM002A-EN-P - July 2002
A-2 Specifications
Input Specifications
Electrical /EMC: The module has passed testing at the following
levels:
•
ESD Immunity
(EN61000-4-2)
•
4 kV contact, 8 kV air, 4 kV indirect
•
Radiated Immunity
(EN61000-4-3)
•
10 V/m , 80 to 1000 MHz, 80% amplitude
modulation, +900 MHz keyed carrier
•
Fast Transient Burst
(EN61000-4-4)
•
2 kV, 5kHz
•
Surge Immunity
(EN61000-4-5)
•
1kV galvanic gun
•
Conducted Immunity
(EN61000-4-6) •
10V, 0.15 to 80MHz
(1) (2)
(1) Conducted Immunity frequency range may be 150 kHz to 30 MHz if the Radiated Immunity frequency range is 30
to 1000 MHz.
(2) For grounded thermocouples, the 10V level is reduced to 3V.
Specification Value
Specification Value
Number of Inputs 4 input channels plus 1 CJC sensor
Resolution 15 bits plus sign
Bus Current Draw (max.) 40 mA at 5V dc
50 mA at 24V dc
Heat Dissipation 1.5 Total Watts (The Watts per point, plus the minimum
Watts, with all points energized.)
Converter Type Delta Sigma
Response Speed per Channel Input filter and configuration dependent. See “Effects of
Filter Frequency on Noise Rejection” on page 3-10
Rated Working Voltage (1)
(1) Rated working voltage is the maximum continuous voltage that can be applied at the input terminal, including
the input signal and the value that floats above ground potential (for example, 30V dc input signal and 20V dc
potential above ground).
30V ac/30V dc
Common Mode Voltage Range
(2)
(2) For proper operation, both the plus and minus input terminals must be within ±10V dc of analog common.
±10V maximum per channel
Common Mode Rejection 115 dB (minimum) at 50 Hz (with 10 Hz or 50 Hz filter)
115 dB (minimum) at 60 Hz (with 10 Hz or 60 Hz filter)
Normal Mode Rejection Ratio 85 dB (minimum) at 50 Hz (with 10 Hz or 50 Hz filter)
85 dB (minimum) at 60 Hz (with 10 Hz or 60 Hz filter)
Maximum Cable Impedance 25
Ω (
for specified accuracy)
Input Impedance >10M
Ω
Open-circuit Detection Time
7 ms to 1.515 seconds (3)
(3) Open-circuit detection time is equal to the module scan time, which is based on the number of enabled
channels, the filter frequency of each channel, and whether cyclic calibration is enabled..
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.