文中提出一種基于CAN 總線的多點式數據采集和SPC 系統,并介紹了SPC 數據采集盒
(SPC-Keyboard)硬件原理和CAN總線防沖撞通訊的設計；引入可標定控制線實現非穩態情況下由于控制線波動對異常因數判定的影響。通過實際應用，驗證了該系統設計和實現的正確性和可靠性。
關鍵詞：CAN 總線；數據采集；統計過程控制；六西格瑪；實時診斷
Abstract: This paper presents a system design of multi-points data acquisition and SPC based
on CAN bus, and introduces the hardware design theory of SPC data acquisition boxes
(SPC-Keyboard) and the design of anti-collision communication based on CAN bus. Because
the Control-line of Control-chart is easy to be fluctuated and some abnormal factor can
not be found in precarious status, the design method is introduced to watch the abnormal
factor in control-chart by using fixed Control-line. The practical application has
confirmed that the system is accurate and reliable under this design framework.
Key words: CAN bus；data acquisition；SPC；6 sigma；Real-time diagnosis