string strSymbolLibName = "IEC_symbol";
string strSymbolName = "M2W";
int nVariant = 0;

//at first initialize SymbolVariant
SymbolLibrary oSymbolLibrary = new SymbolLibrary(m_eplanDemo, strSymbolLibName);
Symbol oSymbol = new Symbol(oSymbolLibrary, strSymbolName);
SymbolVariant oSymbolVariant = new SymbolVariant();
oSymbolVariant.Initialize(oSymbol, nVariant);

//create function
Function oNewFunction = new Function();
oNewFunction.Create(page, oSymbolVariant);

//set function name
oNewFunction.Name = "=AP+ST1-M1";
oNewFunction.VisibleName = "M1";

//set pins descriptions
oNewFunction.Properties.FUNC_CONNECTIONDESIGNATION[1] = "1";
oNewFunction.Properties.FUNC_CONNECTIONDESIGNATION[2] = "2";
oNewFunction.Properties.FUNC_CONNECTIONDESIGNATION[3] = "PE";

//set location
oNewFunction.Location = new PointD(120.0, 215.0);

//adjust representation type
oNewFunction.ManualPlacementType = page.PageType;

Page oPage = m_oTestProject.Pages[9];

string strSymbolLibName = "IEC_symbol";
string strSymbolName = "M3";
int nVariant = 0;

SymbolLibrary oSymbolLibrary = new SymbolLibrary(m_oTestProject, strSymbolLibName);
Symbol oSymbol = new Symbol(oSymbolLibrary, strSymbolName);
SymbolVariant oSymbolVariant = new SymbolVariant();
oSymbolVariant.Initialize(oSymbol, nVariant);

Function oFunction = new Function();
oFunction.Create(oPage, oSymbolVariant);
oFunction.Name = "A";
oFunction.Location = new PointD(100, 100);

Function oFunction2 = new Function();
oFunction2.Create(oPage, oSymbolVariant);
oFunction2.Name = "B";
oFunction2.Location = new PointD(100, 50);

new Generate().Connections(m_oTestProject);