| 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.
| Normal mode: 20ppm/?C max.
Enhanced mode: 10ppm/?C max. |
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
| Range: 0 to 70?C
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 |
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