The 1791-16AC is an AC Block I/O module manufactured by Allen Bradley/Rockwell Automation as part of the 1791 Block I/O module series. It features 16 inputs and 16 outputs and has a power supply, as well as a nominal input voltage of 120 volts AC and 11 milliamps of current. The inputs and outputs of this module are separated into two groups of 8 each. It has an output voltage range of 20 - 132 volts AC. Users of this module must always check the required continuous current for any devices you wish to connect to the 1791-16AC module. This module supports two types of mounting on the I/O module, which are horizontal and vertical mounting. The 1791-16AC module’s output specifications vary based on how you choose to mount the module. In a vertical mounting position, the module sustains a higher output current rating as there is more room allowing for more air circulation as well as cooling throughout the block. When mounted in a vertical position, the module’s output current rating is 600 milliamps at 30 degrees Celsius and 300 milliamps at 60 degrees Celsius while in horizontal mounting position, it has a current rating of 300 milliamps at 30 degrees Celsius and 150 milliamps at 60 degrees Celsius. The user must be aware of the output and input specifications before connecting any device before connecting with this 120 volts AC input a d output block I/O module. Additionally, some things need attention during installing of the Allen Bradley 1791-16AC AC Block I/O module. Specifically, check on whether the terminals are connected externally or internally, as well as wiring connections and the output and input module group.

A product of Allen Bradley / Rockwell Automation, part number 1791-16AC has an on-state voltage range of 79 volts AC to 132 volts AC at a frequency range of 47 hertz to 63 hertz. The off-state voltage of this device's inputs is a maximum of 35 volts. Additionally, the inputs of this product has an on-state current rating of 5 milliamperes minimum at 79 volts at 60 hertz, as well as 12.3 milliamperes maximum at 132 volts at 60 hertz. The off-state current of this module is rated at 2.3 milliamperes minimum at a 60 hertz frequency. The input impedance of this device is a maximum of 15K ohms at a frequency of 60 hertz. This module has an input signal delay of 1.0 millisecond from off to on, while the input signal delay for on to off is a maximum of 26 milliseconds. This device requires an external power source to operate properly. This power source should have a voltage rating of 85 to 132 volts AC at a frequency range of 47 to 63 hertz. Additionally, the external power source should have a current rating of 150 milliamperes. The Allen Bradley 1791-16AC has a few isolation ratings. The isolation ratings of this device include 500 volts AC for the power supply to the RIO, 1250 volts AC for the I/O group-to-group, and 1250 volts AC for the I/O group-to-logic. This module has a maximum power dissipation rating of 22.76 watts. It also has a maximum thermal dissipation rating of 77.6 BTU/hr. This product has physical dimensions that measure 176.5 millimeters x 110.5 millimeters x 98 millimeters, or 6.95 inches x 4.35 inches x 3.85 inches (height x width x depth).