The final FastTab in the MES Setup screen is the Device Status Colours FastTab.
The colours specified within this section of the MES Setup allow the Output screen within the MES to be configured to have a different background colour depending upon the status of the device that is being used. These colours help those walking around the shop floor to easily identify the status of the machine and attract attention to those that are on an unplanned stop.
If you want a specific hue of a colour you can use something called a HEX value, which you can find by using the following online search tool: http://www.cloford.com/resources/colours/500col.htm