Allen Bradley 1746-NI8 SLC I/O Digital Modules

The Allen-Bradley 1746-NI8 is an analog single-slot I/O module for the SLC 500 system. It is suitable for time-sensitive applications that require fast analog signal conversion and high accuracy. The 1746-NI8 module has an 8-Channel input with an isolated backplane. Its backplane current consumption is 200mA and 100mA at 5 Volts DC and 24 Volts DC respectively. It has a maximum backplane power consumption of 1 Watt at 5 Volts DC and 2.4 Watts at 24 Volts DC. The 1746-NI8 can be installed in any I/O slot, except Slot 0 of the SLC 500 I/O chassis. Input signal data is converted to digital data via successive approximation conversion. The 1746-NI8 module uses programmable filter frequencies with a low-pass digital filter for input filtering. It performs continuous autocalibration and has an isolation voltage of 750 Volts DC and 530 Volts AC, tested for 60 seconds. It has a common-mode voltage ranging from -10 to 10 Volts with a maximum of 15 Volts between any two terminals. The 1746-NI8 module comes with a removable terminal block of 18 positions. For wiring, the Belden 8761 or a similar cable must be used with one or two 14 AWG wires per terminal. The cable has a maximum loop impedance of 40 Ohms at the voltage source and 250 Ohms at the current source. For troubleshooting and diagnostics, it has 9 green LED status indicators. The 8 channels have one indicator each to display the input status and one each for displaying the module status. The 1746-NI8 has a Division 2 hazardous environment standard with an operating temperature of 0 to 60 degrees Celsius.

Technical specifications for 1746-NI8

ManufacturerRockwell Automation

BrandAllen-Bradley

Part Number/Catalog No.1746-NI8

SeriesSLC 500

Module TypeAnalog I/O Module

Backplane Current (5 Volts)200 milliamps

Inputs1746-NI4

Backplane Current (24 Volts DC)100 milliamps

Input signal Category-20 to +20 mA (or) -10 to +10V dc

Bandwidth1-75 Hertz

Input Filter Frequencies1 Hz, 2 Hz, 5 Hz, 10 Hz, 20 Hz, 50 Hz, 75 Hz

Update Time6 milliseconds

Chassis locationAny I/O module slot except slot 0

Resolution16 bits

Backplane Current(5 Volts) 200 mA;(24 Volts DC) 100 mA

Step Response0.75-730 milliseconds

Conversion typeSuccessive approximation, switched capacitor

ApplicationsCombination 120 Volts AC I/O

Input Types, Voltage10V dc 1-5V dc 0-5V dc 0-10V dc

Backplane Power Consumption14 Watts Maximum

Input Type, Current0-20 mA 4-20 mA 20 mA 0-1 mA

Input Impedance250 Ohms

Data FormatEngineering Units Scaled for PID Proportional Counts (-32,768 to +32,767 range), Proportional Counts (User Defined Range, Class 3 only). 1746-NI4 Data Form

Cable1492-ACABLE*C

LED Indicators9 green status indicators one for each of 8 channels and one for module status

Thermal Dissipation3.4 Watts

Wire Size14 AWG

UPC10662072678036

UNSPSC32151705