<FONT size=2>This program example includes a group of subroutines and interrupt routines which create a Modbus RTU slave using the Freeport functions of the S7-200. Modbus RTU is a binary protocol.<BR>This program supports the following Modbus functions:</FONT>
<P><FONT size=2>1 Read outputs (coils).</FONT></P>
<P><FONT size=2>2 Read inputs (contacts).</FONT></P>
<P><FONT size=2>3 Read holding registers (V memory).</FONT></P>
<P><FONT size=2>4 Read input registers.</FONT></P>
<P><FONT size=2>5 Write single output.</FONT></P>
<P><FONT size=2>6 Write single holding register.</FONT></P>
<P><FONT size=2>15 Write multiple outputs.</FONT></P>
<P><FONT size=2>16 Write multiple holding registers.</FONT></P>
<P><FONT size=2><IMG src="attachment.asp?path=UploadFiles/2008-4/24129906969.jpg"><BR>Project Example:<A href="attachment.asp?FileID=1998">tip041b.rar</A></FONT></P>
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发表于 2008-4-24 09:27:00