Memory Configuration: Heap Memory - Siemens SINUMERIK 840D sl Function Manual

19.3.4

Memory configuration: Heap memory

Memory requirements
RESU requires compile cycles heap memory for the following function-specific buffers:
● Block buffer
The larger the block buffer (see "Figure 19-6 RESU-specific part programs (Page 713)"),
the larger the number of part program blocks that can be traversed backwards.
32 bytes are required per part program block.
The block buffer can be parameterized directly.
● Block search buffer
The block search buffer contains the information required for processing subprogram
searches in the context of RESU.
180 bytes are required for each subprogram. The block search buffer requires at least 2880
bytes (16 subprogram calls with 180 bytes each).
The block search buffer cannot be parameterized directly.
A function-specific GUD variable displays the size of the block search buffer (for creation
of GUD variables, see Section "Channel-specific GUD variables (Page 722)").
Figure 19-5
Memory configuration
Size of the compile cycle heap memory
The size of the heap memory in KB that can be used by the user for compile cycles is defined
via the memory configuring channel-specific machine data:
MD28105 $MC_MM_NUM_CC_HEAP_MEM
For RESU, the already existing machine data value (x) is adjusted as follows:
MD28105 $MC_MM_NUM_CC_HEAP_MEM = x + 50
Size of the block buffer
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
TE7: Continue machining at the contour (retrace support) - 840D sl only
Division of the heap memory for compile cycles
19.3 Startup
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