enhance the error handling routine while PM offline.

Venus/Venus_RT/Modules/Schedulers/SchedulerLoadLock.cs

@@ -49,7 +49,7 @@ namespace Venus_RT.Modules.Schedulers
 
         public override int TimeToReady
         {
-            get { return (IsOnline && IsInclude) ? _entity.TimeToReady : int.MaxValue; }
+            get { return (IsOnline && IsInclude) ? _entity.TimeToReady : int.MaxValue / 2; ; }
         }
 
         private LLEntity _entity = null;

Venus/Venus_RT/Modules/Schedulers/SchedulerPM.cs

@@ -62,7 +62,7 @@ namespace Venus_RT.Scheduler
 
         public override int TimeToReady
         {
-            get { return (IsOnline && IsInclude)?  _entity.TimeToReady : int.MaxValue; }
+            get { return (IsOnline && IsInclude)?  _entity.TimeToReady : int.MaxValue / 2; }
         }
 
         public override bool IsInclude { get { return _entity.IsInclude; } }