模塊的插件板與總線底板插接不嚴密;
撥碼開關錯誤;通訊線接線方向錯誤;
終端匹配器未接;
硬件跳線與實際信號要求的類型不一致;
機柜內系統電源、現場電源輸出有誤;
硬件本身壞。
以上幾方面問題的結果表現為：
加電后硬件板極故障(指示燈顯示狀態不對);
設備不工作;
系統工作但顯示的對應測點值不正確、系統的輸出不能驅動現場設備等等。
4、軟件報錯，如何處理?
軟件組態與硬件協調有誤出現的問題
數據庫點組態與對應通道連接的現場信號不匹配;
鼠標驅動程序加在COM1口，造成系統在線運行時不能用鼠標操作;
打印機不打印等等。
5、連線接頭改注意哪些問題?
連線接頭問題
連接頭沒有采用壓焊或焊接不好造成虛焊;
熱循環使接頭松動;
螺栓連接點因震動引起松動;
連接點因腐蝕而接觸不良。
6、電源故障改從哪些方面分析?
電源問題
電源問題分為電源連線問題和電源質量問題。
電源連線問題
包括：沒有連線(火、地、零幾項中，其中一項沒接);錯誤連線(火線與零線反接，地線與零線反接，地線與零線多點短接)。
This incident was caused by two reasons: one is the excessive control of unnecessary online traffic; The second is the software vulnerability pointed out in an ISS security announcement in 1998.
Since investigators, hackers and security issues are essentially transferred from the IT field, it may be useful to find solutions from there. In the field of it (especially for personal computers), security vulnerabilities are solved by applying security patches. Unfortunately, this leads to the need to cycle multiple patches throughout the product cycle.
For example, Adobe ? Reader 9.0. For example. Between February 2008 and December 2012, Adobe released 33 important security updates for the product. That is, for a single software application, there is a patch every 7 weeks. In addition, most computers have dozens of applications even if they don't have hundreds, so ordinary it computers need to be patched at least once a week (need to be
