1746-NI8 SLC 500 Analog I/O Module

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.

1746-NI8

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.

The 1746-NI8 features Eight (8) channel analog input module compatible for used with SLC 500 Fixed or

modular hardware style controllers. This module from Allen-Bradley has individually selectable voltage or

current input channels. Available selectable input signals include 10V dc, 1–5V dc, 0–5V dc, 0–10V dc for

Voltage while 0–20 mA, 4–20 mA, +/-20 mA for Current.