96 Control units of the drive Control unit layout and connectionsDescriptionI/O I/O terminals (see following diagram)SLOT 1 I/O extension, encoder interface orfieldbus adapter module connection.(This is the sole location for an FDPI-02diagnostics and panel interface.)SLOT 2 I/O extension, encoder interface orfieldbus adapter module connectionSLOT 3 I/O extension, encoder interface, fieldbusadapter or FSO-xx safety functionsmodule connectionSLOT 4 RDCO-0x DDCS communication optionmodule connectionX205 Memory unit connectionBATTERY Holder for real-time clock battery(CR 2032)AI1 Mode selector for analog input AI1(I = current, U = voltage)AI2 Mode selector for analog input AI2(I = current, U = voltage)D2D TERM Termination switch for drive-to-drive link(D2D)DICOM=DIOGNDGround selection. Determines whetherDICOM is separated from DIOGND (ie.the common reference for the digitalinputs floats).7-segment displayMulticharacter indications are displayed as repeatedsequences of characters(“U” is indicated briefly before “o”.)Control program startup in progress(Flashing) Firmware cannot be started.Memory unit missing or corruptedFirmware download from PC to controlunit in progressAt power-up, the display may show shortindications of eg. “1”, “2”, “b” or “U”.These are normal indications immediatelyafter power-up. If the display ends upshowing any other value than thosedescribed, it indicates a hardware failure.