diff --git a/compiler.cpp b/compiler.cpp
index 37c6476..b2d5ae9 100644
--- a/compiler.cpp
+++ b/compiler.cpp
@@ -405,6 +405,61 @@ QString Compiler::Desc (Component comp) {
 
 }
 
+QString Compiler::IECLabel (Component comp) {
+
+    static const QMap<Component,QString> s = {
+        { Empty, "Empty" },
+        { Cross, "Cross" },
+        { Tunnel, "Tunnel" },
+        { Mesh, "Mesh" },
+        { Bus1, "Bus1" },
+        { Bus2, "Bus2" },
+        { Bus3, "Bus3" },
+        { Bus4, "Bus4" },
+        { Bus5, "Bus5" },
+        { Bus6, "Bus6" },
+        { Write, "Trace" },
+        { Read, "Trace" },
+        { Trace1, "Trace" },
+        { Trace2, "Trace" },
+        { Trace3, "Trace" },
+        { Trace4, "Trace" },
+        { Trace5, "Trace" },
+        { Trace6, "Trace" },
+        { Trace7, "Trace" },
+        { Trace8, "Trace" },
+        { Trace9, "Trace" },
+        { Trace10, "Trace" },
+        { Trace11, "Trace" },
+        { Trace12, "Trace" },
+        { Trace13, "Trace" },
+        { Trace14, "Trace" },
+        { Trace15, "Trace" },
+        { Trace16, "Trace" },
+        { Buffer, "1" },
+        { And, "&" },
+        { Or, "≥1" },
+        { Nor, "≥1" },
+        { Not, "1" },
+        { Nand, "&" },
+        { Xor, "=1" },
+        { Xnor, "=1" },
+        { LatchOn, "LatchOn" },
+        { LatchOff, "LatchOff" },
+        { Clock, "Clock" },
+        { LED, "LED" },
+        { Timer, "Timer" },
+        { Random, "Random" },
+        { Break, "Break" },
+        { Wifi0, "Wifi0" },
+        { Wifi1, "Wifi1" },
+        { Wifi2, "Wifi2" },
+        { Wifi3, "Wifi3" }
+    };
+
+    return s[comp];
+
+}
 
 Compiler::GraphResults Compiler::buildGraphViz (GraphSettings settings) const {
 
@@ -431,7 +486,11 @@ Compiler::GraphResults Compiler::buildGraphViz (GraphSettings settings) const {
         QMap<QString,QString> attrs;
         QString cluster;
 
-        QString label = Desc(graph.entities[id]);
+        QString label;
+        if (settings.iecsymbols)
+            label = IECLabel(graph.entities[id]);
+        else
+            label = Desc(graph.entities[id]);
         if (settings.timinglabels && cgraph[id]->mintiming >= 0 && cgraph[id]->maxtiming >= 0)
             label += QString(" (%1-%2)").arg(cgraph[id]->mintiming).arg(cgraph[id]->maxtiming);
         if (cgraph[id]->isloop)
@@ -459,6 +518,11 @@ Compiler::GraphResults Compiler::buildGraphViz (GraphSettings settings) const {
                 attrs["shape"] = "box";
         }
 
+        if (settings.iecsymbols) {
+            if (cgraph[id]->purpose == Node::Other)
+                attrs["shape"] = "square";
+        }
+
         if (settings.positions != GraphSettings::None) {
             float posx = (id % bpwidth_) * settings.scale;
             float posy = (bpheight_ - id / bpwidth_) * settings.scale;
@@ -484,11 +548,19 @@ Compiler::GraphResults Compiler::buildGraphViz (GraphSettings settings) const {
 
         QMap<QString,QString> attrs;
 
+        const auto isInverted = [] (Component type) {
+            return type == Not || type == Nand || type == Nor || type == Xnor;
+        };
+
         {
             const Node *from = cgraph[conn.first];
             const Node *to = cgraph[conn.second];
             if (from->critpath && to->critpath && from->maxtiming >= to->maxtiming - 1)
                 attrs["color"] = "red";
+            if (isInverted(from->type)) {
+                attrs["dir"] = "both";
+                attrs["arrowtail"] = "odot";
+            }
         }
 
         QStringList attrstrs;
diff --git a/compiler.h b/compiler.h
index ccb3925..c1cd8f1 100644
--- a/compiler.h
+++ b/compiler.h
@@ -99,6 +99,7 @@ class Compiler : public QObject {
 
     static Component Comp (Blueprint::Ink ink);
     static QString Desc (Component comp);
+    static QString IECLabel (Component comp);
 
     explicit Compiler (const Blueprint *bp, QObject *parent = nullptr);
 
@@ -120,7 +121,8 @@ class Compiler : public QObject {
         float scale;
         bool squareio;
         bool highlightloops;
-        GraphSettings () : compressed(false), ioclusters(false), timings(false), timinglabels(false), positions(None), scale(1.0f), squareio(false), highlightloops(true) { }
+        bool iecsymbols;
+        GraphSettings () : compressed(false), ioclusters(false), timings(false), timinglabels(false), positions(None), scale(1.0f), squareio(false), highlightloops(true), iecsymbols(false) { }
     };
 
     struct GraphResults {
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 98dab60..79c2ca5 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -351,6 +351,7 @@ void MainWindow::on_btnNetlistGraph_clicked()
         s.positions = (Compiler::GraphSettings::PosMode)ui_->cbPositions->currentIndex();
         s.scale = ui_->txtPosScale->text().toFloat();
         s.squareio = ui_->chkSquareIO->isChecked();
+        s.iecsymbols = ui_->chkIECSymbols->isChecked();
         Compiler::GraphResults r = c.buildGraphViz(s);
         ui_->txtNetlistOut->setPlainText(r.graphviz.join("\n"));
         if (r.stats.critpathlen != -1) {
diff --git a/mainwindow.ui b/mainwindow.ui
index 901024e..74c689e 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>709</width>
-    <height>477</height>
+    <height>525</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -871,6 +871,13 @@
             </property>
            </widget>
           </item>
+          <item>
+           <widget class="QCheckBox" name="chkIECSymbols">
+            <property name="text">
+             <string>IEC Gate Symbols</string>
+            </property>
+           </widget>
+          </item>
           <item>
            <layout class="QHBoxLayout" name="horizontalLayout_3">
             <item>
@@ -1097,7 +1104,7 @@
  <resources/>
  <connections/>
  <buttongroups>
-  <buttongroup name="grpConvertLayer"/>
   <buttongroup name="grpFontChoice"/>
+  <buttongroup name="grpConvertLayer"/>
  </buttongroups>
 </ui>
diff --git a/vcbtool.pro b/vcbtool.pro
index 6ef9109..94237db 100644
--- a/vcbtool.pro
+++ b/vcbtool.pro
@@ -1,5 +1,5 @@
 QMAKE_TARGET_DESCRIPTION = "VCB Tool"
-VERSION = 1.8.3
+VERSION = 1.8.4
 DEFINES += VCBTOOL_VERSION='\\"$$VERSION\\"'
 
 QT       += core gui