The control unit of the "PY" servo amplifier centers around two processors: DSP and CPU. The portion connected directly to sequence interface alarm processing and other customer controllers is handled by the CPU. Position loop operations, speed loop operations, and various corrections, which are the basic operations conducted by the servo amplifier, are handled by a special-purpose DSP.
The multiple interface, at which Sanyo Denki is strong, is implemented only on the CPU. The operation unit is made independent to achieve high performance, in an attempt to increase development efficiency.
For the "PY" servo amplifiers, the authors proceeded further with inter-processor interface technology that the company had cultivated through its "867Z" and "PZ" servo amplifiers, and enhanced the capability of the processor itself in order to greatly reduce operation time.