Siemens SINUMERIK 840DE sl Commissioning Manual

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General informationNoteWe do not recommend that a USB front interface is permitted for part program execution usingEES if a system has several local USB front interfaces (several TCUs, the use of a HT8, etc.).The connection to the USB FlashDrive can be interrupted as a result of the TCU switchover.This setting should be made using the checkbox "Use this drive for program execution withEES".NoteIf a global USB front interface should be used via PCU, then the PCU must be configured asserver via the VNC connection, see Chapter "Configuring VNC connections (Page 379)".5.2 Setting EXTCALLUsing the EXTCALL command, a program on an external program memory can be called froma part program.EXTCALL must be switched off, when in certain configurations two SINUMERIK Operate areconnected to one NCU.Activating the functionProcessing EXTCALL calls is switched-on or switched-off using the following display machinedata.MD9106 $MM_SERVE_EXTCALL_PROGRAMS= 0 HMI ignores EXTCALL instructions and selection via PLC= 1 HMI processes EXTCALL instructions and selection via PLC (default value)= 2 HMI processes EXTCALL instructions and ignores selection via PLC= 3 HMI ignores EXTCALL instructions and processes selection via PLCNoteA main program selected from an external program memory is selected again automaticallyafter a power-on if the same program memory is still available and execution of EXTCALL callshas been activated in MD9106.5.3 Setting the EESThe EES (Execution from External Storage) function allows part programs for drives to beprocessed directly without reload buffer. The behavior is the same as that for processing fromthe NC part program memory without the restrictions that apply to "processing external".Creating drive connections5.3 Setting the EESSINUMERIK Operate (IM9)82 Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1