plc外文翻譯---plc在應(yīng)用中應(yīng)注意的問(wèn)題-plc設(shè)計(jì)(編輯修改稿)
2025-02-24 06:45 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 e reciprocation moves and rises and falls motion the control system, must establish the exterior spacing protection circuit. (3)The programmable controller has selfchecking functions and so on surveillance timer, when inspects exceptionally, outputs pletely the closure. But when programmable controller CPU breakdown cannot control the output, therefore, regarding can cause the user to cause the damage the dangerous load, to guarantee that the equipment moves under the secure state, must design the external circuit to protect. (4) Power source load protection. If the PLC power source breaks down, the interruption interval is short in 10 seconds, PLC works not affected, if the power source interrupt surpasses 10 second or the power source drops surpasses the permissible value, then the PLC stop work, all output also separates。 when the power source restores, if RUN input connection, then operates carries on automatically. Therefore, to establish the essential current limiting protection circuit to some easy overloading39。s input device. (5) Significant breakdown warning and protection. Regarding easy to have heavy accident39。s place, to guarantee the control system when the heavy accident occurs still the reliable warning and the protection, should have with the significant breakdown the contacting signal to output through the external circuit, caused the control system to move under the safe condition. Fourth, PLC earth the good earth is guaranteed that the PLC reliable work the important condition, may avoid the heterogametic the voltage surge harm. PLC meets the grounding and machine39。s ground terminal docking, meets the grounding the crosssectional area should not to be smaller than 2mm2, the earth resistance is smaller than 100Ω。 If must use the expansion unit, its ground point should accept after checking with the elemental area earth in the same place. In order to suppress adds in the power source and the input end, outport39。s disturbance, should joins the specialpurpose grounding to PLC, the ground point should with the power equipment (for example electrical ma
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