Commissioning - Siemens SINUMERIK 840D sl Function Manual

The value of the machine data indicates how much memory is available to expand the user
data areas (local user data, IPO buffer, etc.) for each channel.
Parts of the dynamic user memory
Passive file system
Partition S of the passive file system is in the dynamic user memory:
Partition
S (Siemens = Control manufacturer)
The size of partition S is preset and cannot be modified.
Dynamic
Memory expansion
If an NCU is used with at least 2 GB of working memory, the machine manufacturer can use
part of the working memory to expand the dynamic user memory.
The size of the additional dynamic user memory is defined in machine data:
MD19251 $ON_USER_MEM_DYNAMIC
Direct modification of the machine data MD18210 $MN_MM_USER_MEM_DYNAMIC
increases or decreases the value.
15.5.2

Commissioning

You can adjust the default memory division by increasing/decreasing individual memory areas
for each user.
Basic procedure:
1. Determining the size of the free dynamic user memory:
MD18050 $MN_INFO_FREE_MEM_DYNAMIC
2. Optional: enlarging the dynamic user memory:
– MD18210 $MN_MM_USER_MEM_DYNAMIC
– Perform a power-on reset.
3. Optional: Setting the size of the memory areas of the dynamic user memory in the machine
data that configure memory (...MM_...):
4. Perform a power-on reset.
The memory will be reconfigured the next time the control starts up.
References:
For a detailed description of machine data, refer to:
● List Manual Machine Data and Parameters
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
15.5 Configuration of the dynamic user memory
Storage of:
Files from the _N_CST_DIR directory (Siemens cycles)
S7: Memory configuration
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