Description / توضیحات
Model 1794-IR8
Number of Inputs 8 channels
Module Location
Cat. No. 1794-TB2, -TB3, -TB3S, -TB3T and -TB3TS Terminal Base Units
Nominal Input Ranges 1 to 433 ohms
Resolution
16 bits across 435 ohms
Common Mode Rejection -120db @ 60Hz; -100db @ 50Hz with A/D filter cutoff @ 10Hz
Common Mode Input Range
0V between channels (common return)
Isolation Voltage Tested at 850V dc for 1s from inputs and user power to logic side
Data Format 16-bit 2 s complement or offset binary (unipolar)
Normal Mode Noise Rejection -60db @ 60Hz for A/D filter cutoff @ 10Hz
Input Offset Drift w/Temperature
1.5 milliohm/?C maximum
Gain Drift w/Temp.
Channel Bandwidth
0-2.62Hz (-3db)
Settling time to 100% of final value Available at system throughput rate
System Throughput
Normal mode - 325ms (1 channel scanned), programmable to 28ms 2.6s (8 channels scanned), programmable to 224ms
Enhanced mode - programmable from 56 to 650ms/channel - 650ms (1 channel scanned), 2.925s (8 channels scanned)
Open TC/RTD Circuit Detection Out of range reading (upscale)
Open TC/RTD Detection Time Available at system throughput rate
Overvoltage Capability 35V dc, 25V ac continuous at 25?C
Overall Drift with Temperature 50ppm/?C of span (maximum)
Cold Junction Compension
A-B catalog number 1794-CJC2
Channel to channel isolation 0V
Indicators 1 red/green power status indicator
Flexbus Current 20mA
Power Dissipation 3.0W maximum @ 31.2V dc
Thermal Dissipation Maximum 10.2 BTU/hr @ 31.2V dc
Keyswitch Position 3
