| 摘要 |
A microprocessor based controller 1 for use in air conditioning systems is capable of controlling two separate control loops and has for each loop at least one input for receiving external values and at least one output for delivering control values. First display means 2 are provided for displaying the value or state of a selected parameter of one or other of the loops, the selected parameter being identified by the illumination of a corresponding discrete display element adjacent an 6 a associated defining legend, the elements and legends being arranged in a list 9 forming a second display. Selector keys 14, 15 are provided for selecting from the list parameter to be displayed. Two further keys 6, 7 are provided for adjusting the value or state of a currently a displayed adjustable value. The microprocessor (20) a performs an auto-configuration routine upon power-up or a interrupt to determine, from the inputs connected, which a parameters may be selected. Self testing routines may be selected by the user to a test the elements of the controller, such as the display. keyboard etc, to assist in fault diagnosis or in a commissioning. <IMAGE> |
