Detect a circle as an anomaly for separation.

Reasons: easier to detect (not our goal to make the perfect oi-sensor
anyway).

Beremiz/beremiz_oi_production_line/plc.xml

 <?xml version='1.0' encoding='utf-8'?>
 <project xmlns:ns1="http://www.plcopen.org/xml/tc6_0201" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.plcopen.org/xml/tc6_0201">
   <fileHeader companyName="Unknown" productName="Unnamed" productVersion="1" creationDateTime="2021-05-14T14:33:11"/>
-  <contentHeader name="Counter (OSIE)" modificationDateTime="2024-05-22T13:06:58">
+  <contentHeader name="Counter (OSIE)" modificationDateTime="2024-05-22T13:47:43">
     <coordinateInfo>
       <fbd>
         <scaling x="0" y="0"/>
@@ -83,30 +83,34 @@
                 </variable>
               </outputVariables>
             </block>
-            <inVariable localId="3" executionOrderId="0" height="25" width="50" negated="false">
+            <inVariable localId="3" executionOrderId="0" height="27" width="50" negated="false">
               <position x="181" y="206"/>
               <connectionPointOut>
-                <relPosition x="50" y="12"/>
+                <relPosition x="50" y="13"/>
               </connectionPointOut>
               <expression>Reset</expression>
             </inVariable>
-            <outVariable localId="4" executionOrderId="0" height="25" width="42" negated="false">
+            <outVariable localId="4" executionOrderId="0" height="27" width="42" negated="false">
               <position x="433" y="266"/>
               <connectionPointIn>
-                <relPosition x="0" y="12"/>
+                <relPosition x="0" y="13"/>
                 <connection refLocalId="2" formalParameter="Out0">
-                  <position x="433" y="278"/>
+                  <position x="433" y="279"/>
+                  <position x="410" y="279"/>
+                  <position x="410" y="278"/>
                   <position x="387" y="278"/>
                 </connection>
               </connectionPointIn>
               <expression>Cnt0</expression>
             </outVariable>
-            <outVariable localId="6" executionOrderId="0" height="25" width="42" negated="false">
+            <outVariable localId="6" executionOrderId="0" height="27" width="42" negated="false">
               <position x="435" y="222"/>
               <connectionPointIn>
-                <relPosition x="0" y="12"/>
+                <relPosition x="0" y="13"/>
                 <connection refLocalId="2" formalParameter="Out1">
-                  <position x="435" y="234"/>
+                  <position x="435" y="235"/>
+                  <position x="411" y="235"/>
+                  <position x="411" y="234"/>
                   <position x="387" y="234"/>
                 </connection>
               </connectionPointIn>
@@ -171,13 +175,13 @@
             <xhtml:p><![CDATA[(* this will always switch on VFD_relay0 which controls conveyor line*)
 VFD_relay0 := 1;
 
-IF OI_sensor_counter=2.0 THEN
-  (* a rectangle was recognized thus switch ON air valve *)
+IF OI_sensor_counter=3.0 THEN
+  (* a circle was recognized thus switch ON air valve *)
   Air_Valve_Relay0 := 1;
 END_IF;
 
-IF  OI_sensor_counter=0.0 OR OI_sensor_counter=1.0 OR OI_sensor_counter=3.0 THEN
-  (* a circle / triangle or nothing was recognized thus switch OFF air valve *)
+IF  OI_sensor_counter=0.0 OR OI_sensor_counter=1.0 OR OI_sensor_counter=2.0 THEN
+  (* a rectange / triangle or nothing was recognized thus switch OFF air valve *)
   Air_Valve_Relay0 := 0;
 END_IF;