5、硬件故障

DCS系統(tǒng)根據(jù)各硬件的功能不同，其故障可分為人機接口故障和過程通道故障，人機接口主要指用于實現(xiàn)人機聯(lián)系功能的工程師站、操作員站、打印機、鍵盤、鼠標(biāo)等；過程通道主要指就地總線、通道、過程處理機、一次元件或控制設(shè)備等。人機接口由多個功能相同的工作站組成，當(dāng)其中一臺發(fā)生故障時，只要處理及時，一般不會影響系統(tǒng)的監(jiān)控操作。過程通道故障發(fā)生再就地總線或一次設(shè)備時，會直接影響控制或檢測功能，因而后果比較嚴(yán)重。

6、人機接口故障

人機接口故障常見的有鼠標(biāo)操作失效、控制操作失效、操作員站死機、薄膜鍵盤功能不正常、打印機不工作等。鼠標(biāo)操作不正常一般是由于內(nèi)部機械裝置長期工作老化或污染，使觸點不能可靠通斷，或因電纜插接不牢固造成與主機不通信，這時只需將其更換檢查即可。

控制操作失效是由于鼠標(biāo)的操作信號不能改變過程通道的狀態(tài)，一方面可能是過程通道硬件本身故障，另一方面可能是操作員站本身軟件缺陷，在設(shè)備負(fù)荷過重或打開的過程窗口過多時，導(dǎo)致不響應(yīng)。在檢查過程通道功能正常后，應(yīng)對操作員站進(jìn)行檢查，必要時進(jìn)行重啟，初始化操作員站。操作員站死機原因比較多，可能由于硬盤或卡件故障、軟件本身有缺陷。

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