01/2007
5.3 Booting
5-111
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
5.3 Booting
5.3.1 SRAM handling
The user data of the NC (machine data, setting data, user variables, part pro-
grams, cycles, etc.), as well as the retentive data of the PLC are battery–backed
in the static memory area (SRAM) of the MCI board.
With each ”NCK power ON RESET” (warm restart) or shutting down Windows
XP correctly, the contents of the SRAM is saved to the hard disk of the PCU as
an SRAM image. In this case, the SRAM image valid until then is also saved to
the hard disk of the PCU as an SRAM backup.
In certain error or servicing instances, the SRAM image or backup can be ac-
cessed so that work can be continued immediately without recommissioning the
SINUMERIK 840Di sl.
Table 5-1 SRAM handling
HW
serial
number
MCI board
SRAM
MCI board
”OK”
SRAM image
(hard disk)
”OK”
SRAM backup
(hard disk)
”OK”
Used user data/remark
Known Yes Not applicable Not applicable MCI/Normal power–up
Known No Yes Not applicable IMAGE/no message box or alarms;
see Section 5.3.3; case 1
Known No No Yes BACKUP/message box and alarm;
see Section 5.3.3; case 2
Known No No No Commissioning/recommissioning required
Unknown Yes Yes Not applicable MCI or IMAGE/Request carried out;
see Chapter5.3.5
Unknown
(
SW update)
Yes Not applicable Not applicable MCI/MessageBox;
See Section 5.3.4
Unknown Yes No Yes MCI or BACKUP/Request carried out; if BACKUP is
selected, message box and alarm will occur;
see Section 5.3.3; case 2
Unknown Yes No No MCI/MessageBox;
See Section 5.3.4
Unknown No Yes Not applicable IMAGE/MessageBox;
see Section 5.3.3; case 1
Unknown No No Yes BACKUP/message box and alarm;
see Section 5.3.3; case 2
Unknown No No No Commissioning/recommissioning required
HW serial number. MCI board
Known: The hardware serial no. of the MCI board matches the
serial number last stored on the PCU.
Unknown: The hardware serial no. of the MCI board does not match the
serial number last stored
on the PCU.
Unknown: Provided that the SRAM of the MCI board is ”OK”, the system does not request
which SRAM (MCI or IMAGE) is to be used when booted for the first time
(
SW update). The SRAM of the MCI board is always used.
SRAM image or SRAM backup (hard disk) ”OK”
Yes: The following criteria must be fulfilled:
1. NC and PLC–SW version of SRAM image or backup must match the
installed software version.
5 Power On and Power–U
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