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VariableIDs.MB1_Low_SysVar_1_Alarm;

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	//get the length of the list for indexing purposes
   	int length = ListManagerGetCount(ListDataType.Menu_List);
   	int index = 0;
   	
	//Temporary holding variables for performing lookups and updates
	int32 variable_guid = 0;
	float variable_value = 0;
	float list_value = 0;
	
	//declare a class to hold the retrieved information
	CustomListData data;
	
	//Loop through the list and update a row when the current list value does not match the variable values in PowerVision folders etc.
	while (index < length)
	{
		//Get the list row
		ListManagerGetItem(ListDataType.Menu_List, index, data);
		
		//Get the list row's Variable GUID value
		variable_guid = data.ReadInt32(CustomListColumn.Menu_List_Guid);
			
		//Get the list row's variable value
		list_value = data.ReadFloat(CustomListColumn.Menu_List_variable);
			
		//Lookup current variable GUID value
		smRead(variable_guid, variable_value);
			
		//Compare current variable value to the value in the list, if different update list
		if(variable_value != list_value)
		{
			data.WriteFloat(CustomListColumn.Menu_List_variable, variable_value);
			ListManagerSetItem(ListDataType.Menu_List, index, data);
		}
		
		index = index + 1;
	}

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PrintNumber(variable_guid);
PrintNumber(VariableIDs.MB1_Low_SysVar_1_Alarm);

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smRead(variable_guid, variable_value); // Returns 0
smRead(1145143296, variable_value);   // Returns 0
smRead(variableIDs.MB1_Low_SysVar_1_Alarm, variable_value); // Returns a true value
smRead(1052, variable_value); // Returns a true value