The A-B 1756-IB16/A is a digital input module manufactured by Allen-Bradley for their ControlLogix programmable logic controller (PLC) system. 

• Function: It reads digital signals from external devices and transmits that information to the PLC. These signals are typically on/off (high/low voltage) representing the state of sensors, switches, or other digital outputs.
• Number of Inputs: 16 individual channels
• Voltage Input: Accepts a wide range of DC voltage, typically 10-31 volts with nominal ratings of 12 or 24 volts.

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Some second-hand products may have obvious scratches on the surface.
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