IEC01000242_2_en.vsdActivatingsignal 2LED 2ManualresetActivatingsignal 1AutomaticresetLED 1DisturbancetRestartIEC01000242 V2 ENFigure 25: Operating sequence 6 (LatchedReset-S), manual reset5.5.3 Function keys5.5.3.1 FunctionalityLocal Human-Machine-Interface (LHMI) has five function buttons, directly to the leftof the LCD, that can be configured either as menu shortcut or control buttons. Eachbutton has an indication LED that can be configured in the application configuration.When used as a menu shortcut, a function button provides a fast way to navigatebetween default nodes in the menu tree. When used as a control, the button can controla binary signal.5.5.3.2 Operation principleEach output on the FNKEYMD1 - FNKEYMD5 function blocks can be controlledfrom the LHMI function keys. By pressing a function button on the LHMI, the outputstatus of the actual function block will change. These binary outputs can in turn beused to control other function blocks, for example, switch control blocks, binary I/Ooutputs etc.FNKEYMD1 - FNKEYMD5 function block also has a number of settings andparameters that control the behavior of the function block. These settings andparameters are normally set using the PST.1MRK 504 135-UEN A Section 5Local Human-Machine-Interface LHMI75Technical manual
