diff --git a/WeldingComponents/WeldingCommon/Views/Recipes/UCScannerObjectTeachingControlBoxViewModel.cs b/WeldingComponents/WeldingCommon/Views/Recipes/UCScannerObjectTeachingControlBoxViewModel.cs
index 0b86682..dd853f5 100644
--- a/WeldingComponents/WeldingCommon/Views/Recipes/UCScannerObjectTeachingControlBoxViewModel.cs
+++ b/WeldingComponents/WeldingCommon/Views/Recipes/UCScannerObjectTeachingControlBoxViewModel.cs
@@ -179,8 +179,14 @@ namespace WeldingCommon.Views
             }
             try
             {
+                // 시뮬 아님 + IO보드 없음 → _iOUnit == null → ReadDI에서 NRE로 꺼짐.
+                // IsConnected()가 _iOUnit null/미연결을 체크하므로, 미연결이면 폴링 스킵(꺼짐 방지).
+                if (_IODevice == null || !_IODevice.IsConnected())
+                {
+                    IsLaserReady = false;
+                }
                 // 변경 후 (260618: IO 결선 변경 12&24 → 11&15)
-                if (_IODevice.ReadDI(11) && _IODevice.ReadDI(15))
+                else if (_IODevice.ReadDI(11) && _IODevice.ReadDI(15))
                 {
                     IsLaserReady = true;
                 }
@@ -188,7 +194,7 @@ namespace WeldingCommon.Views
                 {
                     IsLaserReady = false;
                 }
-          
+
             }
             catch (Exception ex)
             {