xii B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUALINDEXUser-programmable pushbuttonsFlexLogic operands .......................................................................5-146graphical front panel buttons 9 to 16 .................................... 4-29logic diagrams .................................................................................5-118settings ...............................................................................................5-113specifications ..................................................................................... 2-18testing ...................................................................................................... 7-3User-programmable self-test settings .................................5-111VVibration testing specifications .................................................. 2-27Virtual inputsactual values ......................................................................................... 6-3commands ............................................................................................. 7-2explained ...........................................................................................5-192FlexLogic operands .......................................................................5-144logic diagram ...................................................................................5-192settings ...............................................................................................5-192Virtual outputsactual values ......................................................................................... 6-4explained ...........................................................................................5-196FlexLogic operands .......................................................................5-144settings ...............................................................................................5-196Voltage deviation specifications ................................................ 2-27Voltage metering ................................................................................ 6-11VT wiring .................................................................................................. 3-14WWarning messages in Engineer .................................................. 4-70Warning symbol in Offline Window .......................................... 4-68Warning, firmware upload not supported .........................10-14Warranty .....................................................................................................D-1Waveform files, view ......................................................................... 4-79Web access port ................................................................................. 5-91Web server protocol .......................................................................... 5-91Windows requirement ..................................................................... 3-49Wire sizeG.703 and fiber interface ............................................................. 3-41G.703 interface .................................................................................. 3-34RS422 and fiber interface ............................................................ 3-40RS422 interface ................................................................................ 3-38Wiring diagrams ..................................................................................... 3-7Withdrawal from operation ........................................................10-29Wrong transceiver message ........................................................... 7-9XXOR gate explained ........................................................................... 4-82YYellow caution icon in Offline Window ................................... 4-68