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5.8
Determining the Memory Requirements on the SIMATIC
Normally, a MOBY application should not require too much memory on the
SIMATIC S7. However, memory requirements must be considered when the
following general conditions are present.
S SIMATIC S7 with small amount of memory
S Many MOBY channels (SLGs) are processed in one S7.
S Large amounts of data are processed on each MOBY channel.
The example below shows a configuration for the S7 memory required by the
FC 56. Twenty SLGs with 1 KB of MDS data each are to be processed.
FC 56 (required once)
Parameter data block (UDT 10)
Command data block (UDT 50)
DB for MDS data
Total
With this configuration, a SIMATIC CPU with only 48 KB of memory will reach its
limits quickly if even more programs are processed.
FC 56
J31069-D0155-U001-A0-7618
Sample Applications
Memory Requirements [KB]
Per Channel
Total
–
~9
0.3
6
0.03
0.6
1
20
1.33
35.6
5-17
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