From a312e4ec8acababac0c780911f4ed779762dcbcf Mon Sep 17 00:00:00 2001
From: NohDoyeon241104 <otteryeonny@ubisam.com>
Date: Thu, 18 Jun 2026 20:32:35 +0900
Subject: [PATCH] =?UTF-8?q?fix:=20=EB=A0=88=EC=8B=9C=ED=94=BC=20=ED=99=94?=
 =?UTF-8?q?=EB=A9=B4=20IO=20=EB=AF=B8=EC=97=B0=EA=B2=B0=20=EC=8B=9C=20null?=
 =?UTF-8?q?=20=EA=B0=80=EB=93=9C=20(OnMonitoring)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

시뮬 모드가 아니고 IO보드가 없으면 IODevice._iOUnit이 null이라
OnMonitoring의 ReadDI(11/15)에서 NRE 발생(현장 PC에서 레시피 메뉴 진입 시).
IsConnected()로 미연결을 선검사해 폴링을 스킵, 프로그램이 꺼지지 않도록 함.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 .../UCScannerObjectTeachingControlBoxViewModel.cs      | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

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)
             {