High performance servo control with maximum application flexibility, requires a completely digital architecture. Making the positioning system entirely digital, eliminates all the drift, offset, unit-to-unit variations, and other setup adjustments associated with analog control systems. A microprocessor reduces hardware complexity and increases reliability. It is pointed out that requirements for
... [Show full abstract] an industrial digital motion controller include optical isolation for all interface signals, handling of motion-specific discrete I/O, fault detection and a CPU watchdog for fail-safe protection.