The 1746-NIO4I by Allen Bradley is an analog combination module in the SLC 500 series. This module has four total analog channels; in a single slot module, it has two inputs and two outputs with a common voltage mode of -20 to 20 Volts. The common rejection module signal at 60 Hertz is 105 dB; its normal rejection mode signal at 60 Hertz is 55 dB. Its backplane current draw at 5 Volts is 55 mA, whereas with 24 Volts, it increases to 145 mA. This module must receive both 5 and 24 Volts of power from the backplane source of the SLC 500 setup; some similar modules may require an external power source, but the 1746-NIO4I will not work with one.

The 1746-NIO4I contains two current (or voltage) inputs that can be selected by the user per each channel, as well as two current outputs.

It also includes two individual switches (labeled as one and two ) which control the input mode that channels 0 and 1 operate in. In its “ON” state, the channel is configured for current input, where in the “OFF” state, it is configured for voltage.

This unit’s input channels are monitored to filter out high-frequency noises in order to provide at least a 14-bit resolution, or ideally a 16-bit. It has a 2.5 millisecond conversion rate and uses the sigma-delta modulation method for conversion.

At 25 degrees Celsius, the 1746-NIO4I module will have an overall accuracy of plus/minus 0.365% full scale. Anywhere else between 0 and 60 degrees Celsius, the overall accuracy is plus/minus 0.642% full scale. Its gain error is around 0.556% at its maximum between 0 and 60 degrees Celsius, dropping to 0.323% at 25 degrees Celsius. Its accuracy drift is approximately +79 ppm/degree Celsius of full scale, and its gain error drift is plus/minus 67 ppm/degree Celsius.

Technical Specs
Operating Voltage: 85...132V AC
Signal Delay, Max. : on = 35 ms, off = 45 ms
Off-State Current, Max : 2 mA
Number of Inputs: 16
Backplane Current Load @ 5V : 85 mA
Applications: General-purpose 120V AC inputs

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