opc_item_read.xml

opc技术

<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?> 
<!DOCTYPE MAN SYSTEM "man.dtd">
<MAN>
  <LANGUAGE>eng</LANGUAGE>
  <TITLE>opc_item_read</TITLE>
  <TYPE>Scilab Function  </TYPE>
  <DATE>Dec. 2006  </DATE>
  <SHORT_DESCRIPTION name="opc_item_read"> Read all OPC Items Value from OPC Server</SHORT_DESCRIPTION>
  <CALLING_SEQUENCE>
  <CALLING_SEQUENCE_ITEM>item_read=opc_item_read(item_num,flag)</CALLING_SEQUENCE_ITEM>
  </CALLING_SEQUENCE>
  <PARAM>
 <PARAM_INDENT>
  <PARAM_ITEM>
  <PARAM_NAME>item_num</PARAM_NAME>
  <PARAM_DESCRIPTION>
    : The num of OPC Group items
  </PARAM_DESCRIPTION> 
  </PARAM_ITEM>
   <PARAM_ITEM>
  <PARAM_NAME>flag</PARAM_NAME>
  <PARAM_DESCRIPTION>
    : 'i' or 'f', 'i' is integre, 'f' is float
  </PARAM_DESCRIPTION> 
  </PARAM_ITEM>
 </PARAM_INDENT>
  </PARAM>
  <DESCRIPTION>
  <P>
    This function is to read OPC items value from OPC group
  </P>
  </DESCRIPTION>
  <EXAMPLE><![CDATA[
item_num=2
item_read_value=opc_item_read(item_num,flag)
 ]]></EXAMPLE>
  <AUTHOR>Zhe Peng([e-mail]), Longhua Ma. Zhejiang Univ. China   </AUTHOR>
  <SEE_ALSO>
    <SEE_ALSO_ITEM> <LINK>opc_connect</LINK> </SEE_ALSO_ITEM>    
    <SEE_ALSO_ITEM> <LINK>opc_disconnect</LINK> </SEE_ALSO_ITEM>
    <SEE_ALSO_ITEM> <LINK>opc_add_group</LINK> </SEE_ALSO_ITEM>
    <SEE_ALSO_ITEM> <LINK>opc_add_item</LINK> </SEE_ALSO_ITEM>
    <SEE_ALSO_ITEM> <LINK>opc_item_write</LINK> </SEE_ALSO_ITEM>
  </SEE_ALSO>
</MAN>