Difference between absolute and incremental measurement system
The measuring system returns the absolute value of the current position is absolute
Absolute position information is immediately available even after power loss.
The measuring system returns the relative value of the current position is incremental system.
Incremental System must always come back to a reference point.
This occur when the machine initially starts and whenever something interrupts its power supply.
Absolute Magnetic Encoders Incremental Magnetic Encoders