diff --git a/src/ATBAPP/ATBMachineEvent.cpp b/src/ATBAPP/ATBMachineEvent.cpp
index 50fdead..4f34895 100644
--- a/src/ATBAPP/ATBMachineEvent.cpp
+++ b/src/ATBAPP/ATBMachineEvent.cpp
@@ -56,6 +56,9 @@ QString ATBMachineEvent::getEventClassString(EVENT_CLASS eventClass)
     case EVENT_CLASS::STATE:
         return "STATE";
         break;
+    case EVENT_CLASS::OPERATE:
+        return "OPERATE";
+        break;
     case EVENT_CLASS::NOT_DEFINED:
         return "NOT_DEFINED";
         break;
diff --git a/src/ATBAPP/ATBMachineEvent.h b/src/ATBAPP/ATBMachineEvent.h
index ae3bd9c..d041ae1 100644
--- a/src/ATBAPP/ATBMachineEvent.h
+++ b/src/ATBAPP/ATBMachineEvent.h
@@ -41,6 +41,7 @@ enum class EVENT_CLASS : quint8 {
     ALARM,
     DEBUG,
     STATE,
+    OPERATE,
     NOT_DEFINED
 };
 
diff --git a/src/ATBAPP/DeviceControllerDiag.cpp b/src/ATBAPP/DeviceControllerDiag.cpp
index 1ab7bf8..e3d00f0 100644
--- a/src/ATBAPP/DeviceControllerDiag.cpp
+++ b/src/ATBAPP/DeviceControllerDiag.cpp
@@ -261,6 +261,7 @@ uint8_t DeviceControllerDiag::sys_getSystemErrors()
 /**
  * @brief DeviceControllerDiag::private_finishedDiag
  * @param result - result value from 'sub_componentAssessment()',
+ *               - 0x00 everything is fine
  *               - 0xFF on timer interrupt
  *               - 0xFE no valid data from DeviceController
  *               - 0xFD Service or battery door is open
@@ -272,8 +273,6 @@ void DeviceControllerDiag::private_finishedDiag(uint8_t result)
     this->isRequestRunning  = false;
     this->flagInterruptDiag = false;
 
-    if (result == 0) return;
-
     qCritical() << "DeviceControllerDiag::private_finishedDiag() result: " << result;
 
 
@@ -371,6 +370,11 @@ void DeviceControllerDiag::private_finishedDiag(uint8_t result)
         eventClass = EVENT_CLASS::STATE;
         parameter  = "no valid data from DeviceController";
         break;
+    case 0x00:   // everything is fine
+        eventName  = "O000";
+        eventClass = EVENT_CLASS::OPERATE;
+        parameter  = "";
+        break;
     }