The 1791-16BC is a Discrete I/O Block that is manufactured and branded by Allen-Bradley and Rockwell Automation. The 1791-16BC has 16 inputs per block – 2 groups of 8 inputs – and has an on-state voltage range of 10-30 Volts DC. The 1791-16BC has a maximum on-state current of 11 milliamperes at 30 Volts and a minimum on-state current of 2.5 milliamperes at 10 Volts. This 1791-16BC Discrete I/O Block has a maximum off-state voltage of 5 Volts DC, a minimum off-state current of 1.5 milliamperes, and a maximum input impedance of 3.4K Ohms. Fast input signal delay is 1.0 millisecond on, 5.0 milliseconds off (maximum) and slow input signal delay is 1.0 millisecond on, 18.0 milliseconds off (maximum). Output specifications for the 1791-16BC Discrete I/O Block include 16 outputs per block – 2 groups of 8 outputs – and an output voltage range of 10-30 Volts DC. Vertical mounting output current rating is 500 milliamperes at 60 degrees Celsius and 1 Amperes at 30 degrees Celsius, while horizontal mounting output current rating is 250 milliamperes at 60 degrees Celsius and 500 milliamperes at 30 degrees Celsius.

Additional output specifications for the 1791-16BC Discrete I/O Block include a surge current of 3 Amperes for 50 milliseconds each, repeatable every 2 seconds, as well as a minimum on-state current of 1 milliampere per output and a maximum on-state voltage drop of 1.0 Volt at rated current. Off-state leakage current (maximum) is 0.5 milliamperes and output signal delay is 0.5 milliseconds on and 1.0 millisecond off (maximum). General specifications include hardware dimensions of 6.95 x 4.35 x 3.85 inches, or 176.5 x 110.5 x 98 millimeters. Power supply to RIO isolation is 500 Volts AC, I/O Group-to-Group isolation is 500 Volts AC, and I/O Group-to-Logic isolation is 500 Volts AC. Maximum power dissipation is 17.8 British Thermal Units (BTU) per hour. The 1791-16BC can operate in a temperature range of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit) and can be stored in a temperature range of -40 to 85 degrees Celsius (-40 to 185 degrees Fahrenheit). Relative humidity is 5% to 95% (non-condensing).