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It is now cost effective to use a modern touch-screen operator interface, rather than a simple digital readout. This has various advantages over previous systems based on a one or two line alphanumeric display:

	Increased design flexibility. Extra features and customisations can be easily and seamlessly integrated into existing systems.
	All test results, displays and counts can be displayed together on the main displays page. This enables evaluation of the status of the system at a glance.
	All settings can be displayed together on a settings page, allowing easy inspection and modification.
	All input and output states can be displayed together on a diagnostics page. This allows quick fault finding.
	The graphics based nature of the screen allows descriptive text and graphics to appear identifying all settings , results and warnings.
	International language support is made easier since the front panel appearance is controlled by the program rather than being printed or engraved.
	A "cleaner" appearance results from the elimination of individual components for push button switches, bargraph displays, numeric displays, led indicators and selector switches.

In general, the larger display area allows an operator to see all relevant information at a glance. This avoids paging through a long list of parameters and settings, searching for the one of interest. The touch sensitive screen allows quick and easy setting changes. In use, the operator simply touches a displayed setting value. This then lights up to show it is selected. The operator can then press the "UP" or "DOWN" arrows as required to alter the value of the setting. Having the buttons on the screen makes the system more flexible; extra buttons for special functions could be added by simply changing the program.