The Allen-Bradley 1791D-4B0 is a base input module from the CompactBlock I/O 1791D series, representing one of the smallest modules in the lineup. It features four sinking input channels, produces one input byte, and consumes no output bytes during operation. The module includes a DeviceNet adapter with power ratings of 150 milliamps maximum current and 11 to 25 Volts DC voltage, ensuring reliable connectivity within DeviceNet networks. In North America, Europe, and Asia, the 1791D-4B0 may possibly enhance input module performance and could potentially be deployed across the globe, making it an essential component for professional industrial automation and DeviceNet integration.