Allen - Bradley 1791 - 16BC is a discrete I/O module. Here are its brief parameters:
I/O Channels: 16 inputs and 16 outputs, with input voltage range of 10 - 30VDC, and output voltage range of 10 - 30VDC.
Communication: Compatible with Allen - Bradley controller platforms like PLC2, PLC3, PLC5 and SLC 5000 series. Remote I/O baud rate ranges from 57.6K to 230.4K baud.
Power Supply: 19.2 - 30VDC (external power).
Dimensions: 6.95H X 4.35W X 3.85D inches.
Mounting Clearance: 2 - inch clearance required on all sides of the module.
Mounting Options: Support horizontal and vertical mounting. The rated current is 500mA for vertical mounting and 250mA for horizontal mounting at 60°C.
Surge Current: Maximum surge current is 3A for 50 milliseconds.