Inputs are bit operands (0 or 1).
The number of Inputs varies according to the Snap-in I/O Modules and I/O Expansion Modules you integrate into your system.
An Input is an actual hardwired input connection into the controller.
To display a list of operands, click on the Operand tab in the Output Window at bottom of the screen, then select the operand type. Scroll down to view the list