01/2007
11.4 Memory configuration
11-307
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
11.4.1 DRAM memory
The free DRAM memory is displayed in machine data
S MD18050: INFO_FREE_MEM_DYNAMIC (free dynamic memory).
The free DRAM should not be less than 15,000 bytes.
Caution
Before you enlarge DRAM areas, you should first check whether the free
memory is sufficient:
S MD18050: INFO_FREE_MEM_DYNAMIC (free dynamic memory)
If more dynamic memory is requested than is available, the SRAM and
therefore all user data will be cleared without prior warning on the next NCK
start–up!
To avoid data loss, a series startup file should be created before
reconfiguration (see Section 15.2, Page 15-460).
Table 11-13 Machine data required to configure the DRAM
Number Identifier Name/remarks Refer-
ence
General ($MN_ ... )
18050 INFO_FREE_MEM_DYNAMIC Display data of the free dynamic memory
18170 MM_NUM_MAX_FUNC_NAMES Number of miscellaneous functions
18180 MM_NUM_MAX_FUNC_PARAM Number of additional parameters
18210 MM_USER_MEM_DYNAMIC User memory in DRAM
18240 MM_LUD_HASH_TABLE_SIZE Hash table size for user variables
18242 MM_MAX_SIZE_OF_LUD_VALUE Maximum field size of the LUD variables
18250 MM_CHAN_HASH_TABLE_SIZE Hash table size for channel–specific data
18260 MM_NCK_HASH_TABLE_SIZE Hash table size for global data
18340 MM_NUM_CEC_NAMES Number of LEC tables
18342 MM_CEC_MAX_POINTS Max. table size for sag compensation
18500 MM_EXTCOM_TASK_STACK_SIZE Stack size for external communication task
18510 MM_SERVO_TASK_STACK_SIZE Stack size of servo task
18520 MM_DRIVE_TASK_STACK_SIZE Stack size of drive task
Channel–specific ($MC_ ... )
20096 T_M_ADDRESS_EXIT_SPINO Spindle number as address extension /FBW/,
W1
27900 REORG_LOG_LIMIT Percentage of IPO buffer for log file enable
28000 MM_REORG_LOG_FILE_MEM Memory size for REORG /FB/, K1
28010 MM_NUM_REORG_LUD_MODULES Number of modules for local user variables with
REORG
28020 MM_NUM_LUD_NAMES_TOTAL Number of local user variables
Free memory
Machine data
11 NCK Commissionin
with HMI Advanced
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