| 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. |
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| 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) |
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| 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 |
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| 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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