diff --git a/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/State_Running.cpp b/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/State_Running.cpp
index accba63..8075096 100644
--- a/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/State_Running.cpp
+++ b/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/State_Running.cpp
@@ -100,7 +100,16 @@ State<ModbusIP>* RunningState<ModbusIP>::update(Equipment<ModbusIP>* equipment)
     float pf = getPointValue(equipment, "Power Factor");
     float a_pwr = pwr * (pf/100.0f);
     setPointValue(equipment, "Total Apparent Power", a_pwr*1000.0f);
-
+    
+    float preferred = getPointValue(equipment, "ATS_Preferred");
+    if (preferred == 1.0f){
+      setPointValue(equipment, "Source 1 Preferred", 1.0f);
+      setPointValue(equipment, "Source 2 Preferred", 0.0f);
+    }
+    if (preferred == 2.0f){
+      setPointValue(equipment, "Source 1 Preferred", 0.0f);
+      setPointValue(equipment, "Source 2 Preferred", 1.0f);
+    }
 
     _applyStrategies(equipment);
     return nullptr;
diff --git a/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/State_Standby.cpp b/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/State_Standby.cpp
index 39347b3..100cf86 100644
--- a/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/State_Standby.cpp
+++ b/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/State_Standby.cpp
@@ -97,7 +97,18 @@ State<ModbusIP>* StandbyState<ModbusIP>::update(Equipment<ModbusIP>* equipment)
     float a_pwr = pwr * (pf/100.0f);
     setPointValue(equipment, "Total Apparent Power", a_pwr*1000.0f);
 
-
+    /*setPointValue(equipment, "S2 kW", kw);
+    setPointValue(equipment, "S2 MWh", mwh);*/
+    
+    float preferred = getPointValue(equipment, "ATS_Preferred");
+    if (preferred == 1.0f){
+      setPointValue(equipment, "Source 1 Preferred", 1.0f);
+      setPointValue(equipment, "Source 2 Preferred", 0.0f);
+    }
+    if (preferred == 2.0f){
+      setPointValue(equipment, "Source 1 Preferred", 0.0f);
+      setPointValue(equipment, "Source 2 Preferred", 1.0f);
+    }
     _applyStrategies(equipment);
     return nullptr;
 }
diff --git a/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/config.h b/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/config.h
index b781b9e..6df64d2 100644
--- a/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/config.h
+++ b/src/EPMS/ATS/ATS_Eaton_ATC900_RPD_TCP/config.h
@@ -60,6 +60,7 @@
  */
 modbusMap mb_map[] =
 {   
+  {HR,           8,   0,  "ATS_Preferred"},    //Internal to control from Modscan
   {HR,           9,   0,  "ATS_Source"},    //Internal to control from Modscan
   {HR,          10,   0,  "ATS_Load"},      //Internal Fault code from Modscan
   {HR,          11,   0,  "ATS_Rating"},     //Internal Fault code from Modscan
diff --git a/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/State_Running.cpp b/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/State_Running.cpp
index 9dafbf6..cd10304 100644
--- a/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/State_Running.cpp
+++ b/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/State_Running.cpp
@@ -105,6 +105,16 @@ State<ModbusIP>* RunningState<ModbusIP>::update(Equipment<ModbusIP>* equipment)
     setPointValue(equipment, "S2 kW", kw);
     setPointValue(equipment, "S2 MWh", mwh);
     
+    float preferred = getPointValue(equipment, "ATS_Preferred");
+    if (preferred == 1.0f){
+      setBitValue(equipment, "Source Preferred", 9, true);
+      setBitValue(equipment, "Source Preferred", 8, false);
+    }
+    if (preferred == 2.0f){
+      setBitValue(equipment, "Source Preferred", 9, false);
+      setBitValue(equipment, "Source Preferred", 8, true);
+    }
+
     // Apply any strategies defined for the standby state
     _applyStrategies(equipment);
     return nullptr;
diff --git a/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/State_Standby.cpp b/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/State_Standby.cpp
index 10fd829..cb1a547 100644
--- a/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/State_Standby.cpp
+++ b/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/State_Standby.cpp
@@ -96,6 +96,16 @@ State<ModbusIP>* StandbyState<ModbusIP>::update(Equipment<ModbusIP>* equipment)
     float kw = (1.732f * ((real_v_AB + real_v_BC + real_v_CA)/3.0f) * sim_load * pf)*10;
     float mwh = kw *600.0f;
 
+    float preferred = getPointValue(equipment, "ATS_Preferred");
+    if (preferred == 1.0f){
+      setBitValue(equipment, "Source Preferred", 9, true);
+      setBitValue(equipment, "Source Preferred", 8, false);
+    }
+    if (preferred == 2.0f){
+      setBitValue(equipment, "Source Preferred", 9, false);
+      setBitValue(equipment, "Source Preferred", 8, true);
+    }
+
     setPointValue(equipment, "S1 kW", kw);
     setPointValue(equipment, "S1 MWh", mwh);
     _applyStrategies(equipment);
diff --git a/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/config.h b/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/config.h
index 7b5d59e..3f7bcf0 100644
--- a/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/config.h
+++ b/src/EPMS/ATS/ATS_Woodward_DTSC200A_TCP/config.h
@@ -60,6 +60,7 @@
  */
 modbusMap mb_map[] =
 {   
+  {HR,        8,      0,  "ATS_Preferred"},  //Internal to control from Modscan
   {HR,        9,      0,  "ATS_Source"},  //Internal to control from Modscan
   {HR,        10,     0,  "ATS_Load"},
   {HR,        11,     0,  "ATS_Rating"},     //Internal Fault code from Modscan