Incremental encoders

Incremental encoders generate a precisely defined number of pulses per revolution. They are a measure of the angular or linear distance moved. Moreover all encoders generate an index pulse exactly once per revolution.
System solid shaft encoder hollow shaft encoder	Type RA - Ø 35 mm RB - Ø 36.5 mm RB - Ø 35 mm RC - Ø 58 mm RO - Ø 58 mm RU - Ø 58 mm RV - Ø 58 mm RP - Ø 87 mm	Shaft Ø 6 mm 10 mm 12 mm 20 mm 50 mm	Resolution up to 50 up to 125 up to 300 up to 500 up to 1000 up to 2500 up to 10000	Operating voltage 5 V 10 - 30 V

Absolute encoders

Absolute encoders provide an absolute numerical value for each angular position. This code value is available immediately after power is applied. This “absolute” value makes a reference procedure like the one required for the incremental encoder unnecessary.
System singleturn multiturn	Type RN - Ø 58 mm RM - Ø 58 mm	Shaft Ø 6 mm 10 mm 12 mm	Resolution up to 4096 8192 x 4096 up to 8192	Operating voltage 10 - 30 V 9 - 36 V