变频器与PLC通讯的精简设计
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">1</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">、三菱<SPAN lang=EN-US>PLC</SPAN>采用扩展存储器通讯控制变频器的系统配置<SPAN lang=EN-US> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></SPAN></P><P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">1.1 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">系统硬件组成<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">FX2N</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">系列<SPAN lang=EN-US>PLC(</SPAN>产品版本<SPAN lang=EN-US>V 3.00</SPAN>以上<SPAN lang=EN-US>)1</SPAN>台<SPAN lang=EN-US>(</SPAN>软件采用<SPAN lang=EN-US>FX-PCS/WIN-C V 3.00</SPAN>版<SPAN lang=EN-US>)</SPAN>；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">FX2N-485-BD</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">通讯模板<SPAN lang=EN-US>1</SPAN>块<SPAN lang=EN-US>(</SPAN>最长通讯距离<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:chmetcnv w:st="on" UnitName="m" SourceValue="50" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>50m</SPAN></st1:chmetcnv><SPAN lang=EN-US>)</SPAN>；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">或<SPAN lang=EN-US>FX0N-485ADP</SPAN>通讯模块<SPAN lang=EN-US>1</SPAN>块<SPAN lang=EN-US>+FX2N-CNV-BD</SPAN>板<SPAN lang=EN-US>1</SPAN>块<SPAN lang=EN-US>(</SPAN>最长通讯距离<st1:chmetcnv w:st="on" UnitName="m" SourceValue="500" HasSpace="False" Negative="False" NumberType="1" TCSC="0"><SPAN lang=EN-US>500m</SPAN></st1:chmetcnv><SPAN lang=EN-US>)</SPAN>；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">FX2N-ROM-E1</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">功能扩展存储盒<SPAN lang=EN-US>1</SPAN>块<SPAN lang=EN-US>(</SPAN>安装在<SPAN lang=EN-US>PLC</SPAN>本体内<SPAN lang=EN-US>)</SPAN>；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">带<SPAN lang=EN-US>RS485</SPAN>通讯口的三菱变频器<SPAN lang=EN-US>8</SPAN>台<SPAN lang=EN-US>(S500</SPAN>系列、<SPAN lang=EN-US>E500</SPAN>系列、<SPAN lang=EN-US>F500</SPAN>系列、<SPAN lang=EN-US>F700</SPAN>系列、<SPAN lang=EN-US>A500</SPAN>系列、<SPAN lang=EN-US>V500</SPAN>系列等，可以相互混用，总数量不超过<SPAN lang=EN-US>8</SPAN>台；三菱所有系列变频器的通讯参数编号、命令代码和数据代码相同。<SPAN lang=EN-US>)</SPAN>；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">RJ45</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">电缆<SPAN lang=EN-US>(5</SPAN>芯带屏蔽<SPAN lang=EN-US>)</SPAN>；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">终端阻抗器<SPAN lang=EN-US>(</SPAN>终端电阻<SPAN lang=EN-US>)100Ω</SPAN>；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">选件：人机界面<SPAN lang=EN-US>(</SPAN>如<SPAN lang=EN-US>F930GOT</SPAN>等小型触摸屏<SPAN lang=EN-US>)1</SPAN>台。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">1.2 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">硬件安装方法<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">(1) </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">用网线专用压接钳将电缆的一头和<SPAN lang=EN-US>RJ45</SPAN>水晶头进行压接；另一头则按图<SPAN lang=EN-US>1</SPAN>～图<SPAN lang=EN-US>3</SPAN>的方法连接<SPAN lang=EN-US>FX2N-485-BD</SPAN>通讯模板，未使用的<SPAN lang=EN-US>2</SPAN>个<SPAN lang=EN-US>P5S</SPAN>端头不接。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">(2) </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">揭开<SPAN lang=EN-US>PLC</SPAN>主机左边的面板盖<SPAN lang=EN-US>, </SPAN>将<SPAN lang=EN-US>FX2N-485-BD</SPAN>通讯模板和<SPAN lang=EN-US>FX2N-ROM-E1</SPAN>功能扩展存储器安装后盖上面板。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">(3) </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">将<SPAN lang=EN-US>RJ45</SPAN>电缆分别连接变频器的<SPAN lang=EN-US>PU</SPAN>口，网络末端变频器的接受信号端<SPAN lang=EN-US>RDA</SPAN>、<SPAN lang=EN-US>RDB</SPAN>之间连接一只<SPAN lang=EN-US>100Ω</SPAN>终端电阻，以消除由于信号传送速度、传递距离等原因，有可能受到反射的影响而造成的通讯障碍。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">1.3 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">变频器通讯参数设置<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">为了正确地建立通讯，必须在变频器设置与通讯有关的参数如<SPAN lang=EN-US>“</SPAN>站号<SPAN lang=EN-US>”</SPAN>、<SPAN lang=EN-US>“</SPAN>通讯速率<SPAN lang=EN-US>”</SPAN>、<SPAN lang=EN-US>“</SPAN>停止位长<SPAN lang=EN-US>/</SPAN>字长<SPAN lang=EN-US>”</SPAN>、<SPAN lang=EN-US>“</SPAN>奇偶校验<SPAN lang=EN-US>”</SPAN>等等。变频器内的<SPAN lang=EN-US>Pr.117~Pr.124</SPAN>参数用于设置通讯参数。参数设定采用操作面板或变频器设置软件<SPAN lang=EN-US>FR-SW1-SETUP-WE</SPAN>在<SPAN lang=EN-US>PU</SPAN>口进行。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">1.4 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">变频器设定项目和指令代码举例<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">1.5 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">变频器数据代码表举例<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">1.6 PLC</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">编程方法及示例<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">(1) </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">通讯方式<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">PLC</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">与变频器之间采用主从方式进行通讯，<SPAN lang=EN-US>PLC</SPAN>为主机，变频器为从机。<SPAN lang=EN-US>1</SPAN>个网络中只有一台主机，主机通过站号区分不同的从机。它们采用半双工双向通讯，从机只有在收到主机的读写命令后才发送数据。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">(2) </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">变频器控制的<SPAN lang=EN-US>PLC</SPAN>指令规格<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">(3) </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">变频器运行监视的<SPAN lang=EN-US>PLC</SPAN>语句表程序示例及注释<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">LD M8000 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">运行监视；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">EXTR K10 K0 H<st1:chmetcnv w:st="on" UnitName="F" SourceValue="6" HasSpace="False" Negative="False" NumberType="1" TCSC="0">6F</st1:chmetcnv> D0 EXTR K10</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">：运行监视指令；<SPAN lang=EN-US>K0</SPAN>：站号<SPAN lang=EN-US>0</SPAN>；<SPAN lang=EN-US>H<st1:chmetcnv w:st="on" UnitName="F" SourceValue="6" HasSpace="False" Negative="False" NumberType="1" TCSC="0">6F</st1:chmetcnv></SPAN>：频率代码<SPAN lang=EN-US>(</SPAN>见表<SPAN lang=EN-US>1)</SPAN>；<SPAN lang=EN-US> D0</SPAN>：<SPAN lang=EN-US>PLC</SPAN>读取地址<SPAN lang=EN-US>(</SPAN>数据寄存器<SPAN lang=EN-US>)</SPAN>。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">指令解释：<SPAN lang=EN-US>PLC</SPAN>一直监视站号为<SPAN lang=EN-US>0</SPAN>的变频器的转速<SPAN lang=EN-US>(</SPAN>频率<SPAN lang=EN-US>)</SPAN>。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">(4) </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">变频器运行控制的<SPAN lang=EN-US>PLC</SPAN>语句表程序示例及注释<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">LD X0 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">运行指令由<SPAN lang=EN-US>X0</SPAN>输入；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">SET M0 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">置位<SPAN lang=EN-US>M0</SPAN>辅助继电器；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">LD M0 EXTR K11 K0 HFA H02 EXTR K11</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">：运行控制指令；<SPAN lang=EN-US> K0</SPAN>：站号<SPAN lang=EN-US>0</SPAN>；<SPAN lang=EN-US>HFA</SPAN>：运行指令<SPAN lang=EN-US> H02</SPAN>：正转指令。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">AND M8029 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">指令执行结束；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">RST M0 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">复位<SPAN lang=EN-US>M0</SPAN>辅助继电器。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">指令解释：<SPAN lang=EN-US>PLC</SPAN>向站号为<SPAN lang=EN-US>0</SPAN>的变频器发出正转指令。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">(5) </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">变频器参数读取的<SPAN lang=EN-US>PLC</SPAN>语句表程序示例及注释<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">LD X3 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">参数读取指令由<SPAN lang=EN-US>X3</SPAN>输入；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">SET M2 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">置位<SPAN lang=EN-US>M2</SPAN>辅助继电器；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">LD M2 EXTR K12 K3 K2 D2 EXTR K10</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">：变频器参数读取指令；<SPAN lang=EN-US> K3</SPAN>：站号<SPAN lang=EN-US>3</SPAN>；<SPAN lang=EN-US>K2</SPAN>：参数<SPAN lang=EN-US>2-</SPAN>下限频率；<SPAN lang=EN-US> D2</SPAN>：<SPAN lang=EN-US>PLC</SPAN>读取地址<SPAN lang=EN-US>(</SPAN>数据寄存器<SPAN lang=EN-US>)</SPAN>。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">OR RST M2 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">复位<SPAN lang=EN-US>M2</SPAN>辅助继电器。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">指令解释：<SPAN lang=EN-US>PLC</SPAN>一直读取站号<SPAN lang=EN-US>3</SPAN>的变频器的<SPAN lang=EN-US>2</SPAN>号参数<SPAN lang=EN-US>-</SPAN>下限频率。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">(6) </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">变频器参数写入的<SPAN lang=EN-US>PLC</SPAN>语句表程序示例及注释<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">LD X1 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">参数变更指令由<SPAN lang=EN-US>X3</SPAN>输入；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">SET M1 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">置位<SPAN lang=EN-US>M1</SPAN>辅助继电器；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">LD M1 EXTR K13 K3 K7 K10 EXTR K13</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">：变频器参数写入指令；<SPAN lang=EN-US>K3</SPAN>：站号<SPAN lang=EN-US>3</SPAN>；<SPAN lang=EN-US>K7</SPAN>：参数<SPAN lang=EN-US>7-</SPAN>加速时间；<SPAN lang=EN-US>K10</SPAN>：写入的数值。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">EXTR K13 K3 K8 K10 EXTR K13</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">：变频器参数写入指令；<SPAN lang=EN-US>K3</SPAN>：站号<SPAN lang=EN-US>3</SPAN>；<SPAN lang=EN-US>K8</SPAN>：参数<SPAN lang=EN-US>8-</SPAN>减速时间；<SPAN lang=EN-US> K10</SPAN>：写入的数值。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">AND M8029 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">指令执行结束；<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">RST M1 </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">复位<SPAN lang=EN-US>M1</SPAN>辅助继电器。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">指令解释：<SPAN lang=EN-US>PLC</SPAN>将站号<SPAN lang=EN-US>3</SPAN>的变频器的<SPAN lang=EN-US>7</SPAN>号参数<SPAN lang=EN-US>-</SPAN>加速时间、<SPAN lang=EN-US>8</SPAN>号参数<SPAN lang=EN-US>-</SPAN>减速时间变更为<SPAN lang=EN-US>10</SPAN>。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">2</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">、三菱<SPAN lang=EN-US>PLC</SPAN>控制变频器的各种方法综合评述与对比<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">2.1 PLC</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">的开关量信号控制变频器<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">PLC(MR</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">型或<SPAN lang=EN-US>MT</SPAN>型<SPAN lang=EN-US>)</SPAN>的输出点、<SPAN lang=EN-US>COM</SPAN>点直接与变频器的<SPAN lang=EN-US>STF(</SPAN>正转启动<SPAN lang=EN-US>)</SPAN>、<SPAN lang=EN-US>RH(</SPAN>高速<SPAN lang=EN-US>)</SPAN>、<SPAN lang=EN-US>RM(</SPAN>中速<SPAN lang=EN-US>)</SPAN>、<SPAN lang=EN-US>RL(</SPAN>低速<SPAN lang=EN-US>)</SPAN>、输入端<SPAN lang=EN-US>SG</SPAN>等端口分别相连。<SPAN lang=EN-US>PLC</SPAN>可以通过程序控制变频器的启动、停止、复位； 也可以控制变频器高速、中速、低速端子的不同组合实现多段速度运行。但是，因为它是采用开关量来实施控制的，其调速曲线不是一条连续平滑的曲线，也无法实现精细的速度调节。这种开关量控制方法，其调速精度无法与采用扩展存储器通讯控制的相比。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">2.2 PLC</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">的模拟量信号控制变频器<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">硬件：<SPAN lang=EN-US>FX1N</SPAN>型、<SPAN lang=EN-US>FX2N</SPAN>型<SPAN lang=EN-US>PLC</SPAN>主机，配置<SPAN lang=EN-US>1</SPAN>路简易型的<SPAN lang=EN-US>FX1N-1DA-BD</SPAN>扩展模拟量输出板； 或模拟量输入输出混合模块<SPAN lang=EN-US>FX0N-3A</SPAN>； 或两路输出的<SPAN lang=EN-US>FX2N-2DA</SPAN>； 或四路输出的<SPAN lang=EN-US>FX2N-4DA</SPAN>模块等。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">优点：<SPAN lang=EN-US> PLC</SPAN>程序编制简单方便，调速曲线平滑连续、工作稳定。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">缺点： 在大规模生产线中，控制电缆较长，尤其是<SPAN lang=EN-US>DA</SPAN>模块采用电压信号输出时，线路有较大的电压降，影响了系统的稳定性和可靠性。另外，从经济角度考虑，如控制<SPAN lang=EN-US>8</SPAN>台变频器，需要<SPAN lang=EN-US>2</SPAN>块<SPAN lang=EN-US>FX2N-4DA</SPAN>模块，其造价是采用扩展存储器通讯控制的<SPAN lang=EN-US>5</SPAN>～<SPAN lang=EN-US>7</SPAN>倍。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">2.3 PLC</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">采用<SPAN lang=EN-US>RS-485</SPAN>无协议通讯方法控制变频器<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">这是使用得最为普遍的一种方法，<SPAN lang=EN-US>PLC</SPAN>采用<SPAN lang=EN-US>RS</SPAN>串行通讯指令编程。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">优点：硬件简单、造价最低，可控制<SPAN lang=EN-US>32</SPAN>台变频器。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">缺点：编程工作量较大。从本文的第二章可知：采用扩展存储器通讯控制的编程极其简单，从事过<SPAN lang=EN-US>PLC</SPAN>编程的技术人员只要知道怎样查表，仅仅数小时即可掌握，增加的硬件费用也很低。这种方法编程的轻松程度，是采用<SPAN lang=EN-US>RS-485</SPAN>无协议通讯控制变频器的方法所无法相比的。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">2.4 PLC</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">采用<SPAN lang=EN-US>RS-485</SPAN>的<SPAN lang=EN-US>Modbus-RTU</SPAN>通讯方法控制变频器<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">三菱新型<SPAN lang=EN-US>F700</SPAN>系列变频器使用<SPAN lang=EN-US>RS-485</SPAN>端子利用<SPAN lang=EN-US>Modbus-RTU</SPAN>协议与<SPAN lang=EN-US>PLC</SPAN>进行通讯。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">优点：<SPAN lang=EN-US> Modbus</SPAN>通讯方式的<SPAN lang=EN-US>PLC</SPAN>编程比<SPAN lang=EN-US>RS-485</SPAN>无协议方式要简单便捷。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">缺点：<SPAN lang=EN-US> PLC</SPAN>编程工作量仍然较大。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">2.5 PLC</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">采用现场总线方式控制变频器<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">三菱变频器可内置各种类型的通讯选件，如用于<SPAN lang=EN-US>CC-Link</SPAN>现场总线的<SPAN lang=EN-US>FR-A5NC</SPAN>选件； 用于<SPAN lang=EN-US>Profibus DP</SPAN>现场总线的<SPAN lang=EN-US>FR-A5AP(A)</SPAN>选件； 用于<SPAN lang=EN-US>DeviceNet</SPAN>现场总线的<SPAN lang=EN-US>FR-A5ND</SPAN>选件等等。三菱<SPAN lang=EN-US>FX</SPAN>系列<SPAN lang=EN-US>PLC</SPAN>有对应的通讯接口模块与之对接。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">优点： 速度快、距离远、效率高、工作稳定、编程简单、可连接变频器数量多。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">缺点： 造价较高，远远高于采用扩展存储器通讯控制的造价。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">综上所述，<SPAN lang=EN-US>PLC</SPAN>采用扩展存储器通讯控制变频器的方法确有造价低廉、易学易用、性能可靠的优势； 若配置人机界面，变频器参数设定和监控将变得更加便利。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto" align=left><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">1</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 0pt; mso-bidi-font-family: 宋体">台<SPAN lang=EN-US>PLC</SPAN>和不多于<SPAN lang=EN-US>8</SPAN>台变频器组成的交流变频传动系统是常见的小型工业自动化系统，广泛地应用在小型造纸生产线、单面瓦楞纸板机械、塑料薄膜生产线、印染煮漂机械、活套式金属拉丝机等各个工业领域。采用简便控制方法，可以使工程方案拥有通讯控制的诸多优势，又可省却<SPAN lang=EN-US>RS-485</SPAN>数据通讯中的诸多繁杂计算，使工程质量和工作效率得到极大的提高。但是，这种简便方法也有其缺陷：它只能控制变频器而不能控制其它器件；此外，控制变频器的数量也受到了限制。<SPAN lang=EN-US> <o:p></o:p></SPAN></SPAN></P>
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