模塊的插件板與總線(xiàn)底板插接不嚴密;
撥碼開(kāi)關(guān)錯誤;通訊線(xiàn)接線(xiàn)方向錯誤;
終端匹配器未接;
硬件跳線(xiàn)與實(shí)際信號要求的類(lèi)型不一致;
機柜內系統電源、現場(chǎng)電源輸出有誤;
硬件本身壞。
以上幾方面問(wèn)題的結果表現為：
加電后硬件板極故障(指示燈顯示狀態(tài)不對);
設備不工作;
系統工作但顯示的對應測點(diǎn)值不正確、系統的輸出不能驅動(dòng)現場(chǎng)設備等等。
4、軟件報錯，如何處理?
軟件組態(tài)與硬件協(xié)調有誤出現的問(wèn)題
數據庫點(diǎn)組態(tài)與對應通道連接的現場(chǎng)信號不匹配;
鼠標驅動(dòng)程序加在COM1口，造成系統在線(xiàn)運行時(shí)不能用鼠標操作;
打印機不打印等等。
5、連線(xiàn)接頭改注意哪些問(wèn)題?
連線(xiàn)接頭問(wèn)題
連接頭沒(méi)有采用壓焊或焊接不好造成虛焊;
熱循環(huán)使接頭松動(dòng);
螺栓連接點(diǎn)因震動(dòng)引起松動(dòng);
連接點(diǎn)因腐蝕而接觸不良。
6、電源故障改從哪些方面分析?
電源問(wèn)題
電源問(wèn)題分為電源連線(xiàn)問(wèn)題和電源質(zhì)量問(wèn)題。
電源連線(xiàn)問(wèn)題
包括：沒(méi)有連線(xiàn)(火、地、零幾項中，其中一項沒(méi)接);錯誤連線(xiàn)(火線(xiàn)與零線(xiàn)反接，地線(xiàn)與零線(xiàn)反接，地線(xiàn)與零線(xiàn)多點(diǎn)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
