1746-NI8 Allen-Bradley SLC 500 Analog I/O Module

1746-NI8

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.