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黄一钫 发表于 2006-10-28 18:08:13

PLC设计的注意事项

<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计可编程控制器时，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">安全性是第一重要的，即即使在外部的电源发生异常时，可编程控制器出现故障时，整个系统也能在安全状态下工作，请务必在可编程控制器外部，设置安全电路，误操作，误输出是产生事故的原因。</SPAN></FONT><SPAN lang=EN-US><FONT face="Times New Roman"><FONT size=3>  <BR><SPAN class=px14> </SPAN><BR><SPAN class=px14>    1.</SPAN></FONT></FONT></SPAN><SPAN class=px14><FONT size=3><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">务必在可编程控制器外部，设置如下几种电路，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">  </FONT></SPAN></FONT></SPAN><SPAN lang=EN-US><BR></SPAN><FONT size=3><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　紧急停止电路，保护电路，正转逆转等相反操作的连锁电路，定位的上限</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">/</FONT></SPAN></SPAN><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下线等防止损坏的连锁电路。</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></SPAN></FONT><SPAN lang=EN-US><BR><FONT face="Times New Roman"><FONT size=3><SPAN class=px14>  </SPAN><BR><SPAN class=px14>    2.</SPAN></FONT></FONT></SPAN><FONT size=3><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">可编程控制器</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CPU</FONT></SPAN></SPAN><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有监视定时器等自检功能</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></SPAN></FONT><SPAN lang=EN-US><BR></SPAN><FONT size=3><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　可编程控制器</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CPU</FONT></SPAN></SPAN><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">以监视定时器等自检功能，检测出异常时，输出全部关闭，担当可编程控制器的</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CPU</FONT></SPAN></SPAN><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">检测不出输入输出控制部分的异常时就不能控制输出，这时，为使机器在安全状态下运行，请设计外电路及机构</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">   </FONT></SPAN></SPAN></FONT><SPAN lang=EN-US><BR><BR><SPAN class=px14><FONT face="Times New Roman" size=3>    3.</FONT></SPAN></SPAN><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><FONT size=3>设计确保传感器的后备电源产生过负荷时的安全：</FONT></SPAN></SPAN><SPAN lang=EN-US><BR><SPAN class=px14><FONT face="Times New Roman" size=3>  </FONT></SPAN></SPAN><FONT size=3><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　传感器的后备电源产生过负荷时，电压自动下降，除可编程控制器输入不工作之外，全部输出都关闭，这时，请设计外电路和机构，以使其在安全状况下工作。</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></SPAN><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">｜</SPAN></SPAN></FONT><SPAN lang=EN-US><BR><FONT face="Times New Roman"><FONT size=3><SPAN class=px14>  </SPAN><BR><SPAN class=px14>   4.</SPAN></FONT></FONT></SPAN><SPAN class=px14><FONT size=3><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计确保当有与重大故障有联系的输出信号时机器的安全：</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">  </FONT></SPAN></FONT></SPAN><SPAN lang=EN-US><BR></SPAN><FONT size=3><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　　因输出继电器，晶体管的故障，输出时而为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">ON,</FONT></SPAN></SPAN><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时而为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">OFF</FONT></SPAN></SPAN><SPAN class=px14><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的现象出现，当有与重大故障有联系的输出信号时，请设计外电路和机构，以使机器在安全状况下运行。</SPAN><SPAN lang=EN-US><FONT face="Times New Roman"> </FONT></SPAN></SPAN></FONT></P>

能源员 发表于 2006-10-28 20:53:53

Re: PLC设计的注意事项

看了
不错!
楼主能否发多发一些工艺流程,让大家编写程序!!!
这是我本人的提议,不知道是否明白!

啧啧啧400 发表于 2016-4-6 10:08:22

plc学多久能成熟？

liuyy32 发表于 2016-4-6 12:06:26

这个是高手啊

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