Allen-Bradley 1746-NIO4V SLC 500 Analog Module 2-Inputs 2-Voltage Outputs

SLC 4 point Analog Voltage Comb Module

The 1746-NIO4V SLC 500 Analog Combination I/O Module by Allen-Bradley is an I/O module installed on the 1746 Chassis that has 2 user-selectable (per channel) current or voltage inputs and 2 voltage outputs. It has 2 current-loop inputs with a normal rating of -20 to 20mA at a 250 Ohm impedance and an input accuracy of +/- 0.642% at a drift rate of 79 ppm/5 degrees Celsius. Its two input points also have voltage ratings of -10 to 10 Volts DC with an impedance of 1M Ohm and a 10 Volt DC full-scale resolution of 305.176 ? V per LSB. The voltage inputs have an accuracy of +/-0.504%, an overall drift accuracy of +/- 63 ppm/degree Celsius, and a maximum gain error of +/- 0.461%. The inputs have an offset error of +/- 14 LSB at 0 to 60 degrees Celsius, and the 1746-NIO4V maximum overvoltage protection across the input terminals comes in at either 220 Volts AC or 220 Volts DC. It uses the R-2R Ladder Digital-to-Analog Converter (DAC) with a converter resolution of 14 bits at its voltage output and a response time of 2 milliseconds.

 

1. Process control signal isolation and conversion: The 1746-NIO4V module is dedicated to industrial field signal conditioning and supports 4 analog input/output (±10V/0-20mA). It is suitable for occasions requiring high-precision signal isolation, such as chemical reactor temperature-pressure closed-loop control, water treatment pH adjustment, etc. Its 1500V isolation voltage between channels effectively prevents signal crosstalk and ensures accurate acquisition and output of process parameters.
2. Test and measurement equipment integration: In laboratories and production line test benches, this module can convert sensor signals (such as strain gauges and displacement sensors) into standard analog signals for data acquisition system processing. Typical applications include torque-speed monitoring of motor performance test benches, voltage/current calibration of automated test equipment, etc. Its ±0.1% accuracy meets the requirements of the ISO 17025 calibration system.
3. Traditional system analog expansion: As an expansion module of the SLC 500 system, the 1746-NIO4V provides an economical solution for the transformation of old equipment. For example, in the metallurgical industry, thermocouple signals can be converted into 4-20mA and connected to the PLC; in food processing, the speed of the frequency converter is controlled by analog output, avoiding the need to replace the entire control system and saving more than 60% of the transformation cost.

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