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The Allen Bradley 1746-NI4 is a versatile SLC 500 series analog input module equipped with four differential non-isolated channels, configurable for either voltage or current input, making it suitable for various monitoring and control applications. It offers a 16-bit resolution and features a removable terminal block for efficient connectivity, with a DIP switch allowing selection between input modes. With an input range of -20 to +20 mA for current or -10 to +10 VDC for voltage, it incorporates Delta-Sigma Modulation for precise conversion, while built-in diagnostics and LED indicators ensure efficient module status and channel monitoring, enhancing troubleshooting and system availability.