Siemens SINUMERIK 840C Installation Instructions Manual page 1043

12 Functional Descriptions
12.25.4 Memory configuration on control power-up
However, the block buffer number may be set to zero only for those channels which will never
be activated for the machine tool in question. It is not possible for the NC-SW to perform a
check during power-up of the number of defined channels or of the number of block buffers
defined in these channels by the user since a valid MD block may not be available at the time
the test is carried out.
However, if an existing channel (MD 100*) is programmed as having 0 block buffers, alarm 50
"Not enough memory for block buffer" (as from SW 5: Error in flexible memory
configuration) is output during power-up on transition to cyclic operation.
Extended overstore
As from SW5.5, the function "Extended overstore" is enabled in the "Flexible memory
configuration". The file can be edited via the MDD menu tree Startup/Machine data/NC
machine data/ETC/flex. memory conf.
The function can be switched on or off in the channel-specific toggle field "Data for extended
overstore". No memory is reserved, if the function is switched over for a channel, for which no
block buffers have been defined.
As a default, the function is switched on for channels 1 and 2 and switched off for channels 3
to 6.
Memory for real axes
If the user defines more than 15 axes (default value), the system reserves a memory space of
approx. 16 KB per axis. The memory is enabled via the machine data "Memory for real axes"
(MD 60013), which is stored in the "ncmemcfg" file. This file can be edited via the MDD menu
tree Machine data/NC machine data/ETC/flex. memory conf. If the user has defined more
real axes than memory is available, alarm 71 is displayed. The number of axes, for which
memory is available, is indicated ot the SERVO on transmission of the axis-independent data.
Dialog box messages
Description of error reactions
Errors which are indicated by MMC:
• Dialog box "Standard memory configuration error in configuration file" is output if the
NC detects that the memory cannot be configured with the values entered in the memory
configuration MD.
• Dialog box "UMS too large UMS not loaded" is output if the user attempts to load a
UMS (MD 60000 not set to zero) which is too large for the memory space available (i.e.
value in MD 60000 is lower than actual UMS size).
• Dialog box "Only possible in reset" is output if an attempt is made to reconfigure the NC
memory by means of softkey "Reconfig. memory" when the NC is not in general reset
mode.
• Dialog box "Insufficient memory space" is output if softkey "Reconfig. memory" is
selected and the free remaining memory is negative.
• Dialog text "Values only from ... to ..." is output in the MDD display if an attempt is made
to enter a value which is not within the permissible [minimum, maximum] value range.
• Dialog text "No input authorization" appears in the MDD display it an attempt is made to
change machine data in file NCMEMCFG in the Siemens branch or online.
12–268
© Siemens AG 1992 All Rights Reserved
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SINUMERIK 840C (IA)