They are really the same, but by convention are used for different things. Both are just flags that can be on or off, and can be set by input, and can used as output to control some functionality.
Physical/software input ----> INPUT ---> read with S0003
Lock with M0019 ----> ---> output to functionality
RSMP inputs and outputs can be a bit confusing,
They are really the same, but by convention are used for different things. Both are just flags that can be on or off, and can be set by input, and can used as output to control some functionality.