plc外文翻譯---plc在應(yīng)用中應(yīng)注意的問題-plc設(shè)計-全文預(yù)覽
【正文】 PU, the switching time in 1~3 scanning periods, the I/O system39。 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。 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 service life, therefore, time use inductive load the selective relay working life must be long. (4) The PLC output load possibly has the disturbance, must therefore take the measure to control, if directcurrent output39。s ties cable should lie alone, prevents the outside signal the disturbance. (5) The exchange output line and the directcurrent output line do not use the identical root electric cable, the output line to be far away from the high tension line and the power line as far as possible, avoids parallel. Second, I/O end wiring 1. Input wiring (1) inputs the wiring not to surpass 30 meters generally. But if the environment disturbance is small, when the loss of voltage is not big, the input wiring may suitable long. (2)Inputs/the output line not to be able to use the identical root electric cable, the input/output line to be separated. (3)Uses the normally opened contact form to connect the input end as far as possible, causes the establishment the trapezoidal chart to be consistent with the relay schematic diagram, is advantageous for reading. 2. Outgoing junction (1) The output wiring divides into the independent output and the public output. In not group, may use the different type and the voltage class output voltage. But can only use the identical type, the identical voltage class power source in the identical group39。s transmission should use the shielded wire, the shielding layer should an end or the both sides earth, and the earth resistance should be smaller than the shielding layer resistance 1/10. (4) The PLC elemental area and the expansion unit as well as functional
研究報告相關(guān)推薦
鄂ICP備17016276號-1