Position information fault detector for absolute value linear coder for machine tool linear motor drive system

摘要

The fault detector has an absolute value position sensor providing a random sequence code signal used for generation of 2 M-sequence codes with different cycle periods having a primary number relationship to one another via an Exclusive-OR operation and an incremental position sensor providing position values (PAO) converted into bit values corresponding to the output signal of the absolute value position sensor. Processed codes are compared for fault signal (ER) provision.