Iso and leackage error messages added

PLC/GVLs/GVL_CONFIG.TcGVL

@@ -305,6 +305,9 @@ VAR_GLOBAL PERSISTENT
 	// All modules in string not ready timeout
 	timStringReadyTimeout : TIME := T#3M;
 	
+	// Timeout for isolation error
+	timIsoErrorTimeout : TIME := T#20s;
+	
 	// Dummy to deactivate functions
 	xDummy : BOOL := FALSE;