Patent ID: 11061839

Abstract:
An input/output control unit (120) includes a storage, an input/output controller (126), an analog signal input interface (129), and a pulse signal input interface (127A). The input/output controller (126) includes a pulse signal input block (1411) to generate a trigger signal, an A/D conversion block (1431) to generate wafer thickness information by analog-to-digital conversion of an analog signal, a logger block (1501) to, in synchronization with the trigger signal, store the wafer thickness information a preset table A in the storage, a counter block (1461) to continuously generate, from the digital signal, count value information indicating a count value and output the generated information, and a logger block (1502) to, in synchronization with the trigger information, store the count value information, in association with the wafer thickness information, in a table TB in the storage (124).