1746-NT8

Overview

1746-NT8 is an 8-channel thermocouple/mV analog input module from Allen-Bradley’s SLC 500 series.

Power Requirements

• Backplane Current (5V DC): 120 mA

• Backplane Current (24V DC): 70 mA

• Backplane Power Consumption: 2.28W max (0.5W at 5V DC, 1.68W at 24V DC)

Input Configuration

• Number of Channels: 8 (backplane and channel-to-channel isolated)

• I/O Chassis Location: Any I/O slot except slot 0

• A/D Conversion Method: Sigma-Delta Modulation

• Input Filtering: Low pass digital filter with programmable notch frequencies

Signal Performance

• Normal Mode Rejection: 100 dB at 50/60 Hz (between [+] input and [-] input)

• Common Mode Rejection: 100 dB at 50/60 Hz (between input and ground)

Input Filter Cut-Off Frequencies

• 2.6 Hz at 10 Hz filter

• 13.1 Hz at 50 Hz filter

• 15.72 Hz at 60 Hz filter

• 65.5 Hz at 250 Hz filter

Calibration

• Auto-calibrates at power-up and approximately every 2 minutes thereafter

Protection and Isolation

• Input Over Voltage Protection: ±30V DC continuous, 600W pulse for 1 msec

• Isolation: 500V DC for 1 minute between inputs and chassis ground, and between inputs and backplane

• Channel-to-Channel Isolation: 12.5V DC continuous

Indicators and Codes

• LED Indicators: 9 green status LEDs (8 channel indicators + 1 module status)

• Module ID Code: 3533

Wiring

• Maximum Wire Size: One 14 AWG or two 22 AWG wires per terminal

• Replacement Terminal Block: 1746-RT34

Environmental Conditions

• Operating Temperature: 0°C to +60°C (+32°F to +140°F)

• Storage Temperature: -40°C to +85°C (-40°F to +185°F)

• Relative Humidity: 5% to 95% (non-condensing)

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