Dynamic Ram Memory - Siemens SINUMERIK FM-NC Installation And Startup Manual

03.96
Caution
!
Before increasing the DRAM areas (e.g. local user variables, function
parameters), check first that there is enough memory available (MD 18050
must be higher than 15000). If more dynamic memory is requested than is
available, the SRAM is also erased without prior warning the next time the
control is powered up and the following user data are lost:
–
–
–
–
References:
6.7.1

Dynamic RAM memory

Set the following machine data:
Table 6-6 MDs for allocating DRAM
MDs for DRAM
MD 18242: MM_MAX_SIZE_OF_LUD_VALUE
MD 28040: MM_LUD_VALUE_MEM
DRAM check
Check the available DRAM memory area in MD 18050. Values of more than
15000 must be displayed. If the value is lower, the memory resources are ex-
hausted and there is a risk that user data will be lost if more DRAM memory
space is allocated.
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SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
6 Assigning Parameters to the Control and the PLC Program
Drive machine data
Part programs
Memory configuration data
Configurable memory areas
/FB/, Step7, Memory Configuration
This data is preset to 8192 bytes for "Cycle 95". It can be
reduced to 2048 if Cycle 95 is not in use.
Memory size for local user variables.You should increase
this MD from 25 Kbytes (default) to 35 – 50 Kbytes only if
you need more than 2048 bytes in MD 18242.
6.7 Memory configuration
Meaning
6-103
6