Sample Applications
5-17
FC 56
J31069-D0155-U001-A0-7618
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.
Memory Requirements [KB]
Per Channel
Total
FC 56 (required once)
Parameter data block (UDT 10)
Command data block (UDT 50)
DB for MDS data
–
0.3
0.03
1
~9
6
0.6
20
Total
1.33
35.6
With this configuration, a SIMATIC CPU with only 48 KB of memory will reach its
limits quickly if even more programs are processed.
Summary of Contents for MOBY FC 56
Page 12: ...Introduction 1 6 FC 56 J31069 D0155 U001 A0 7618 ...
Page 63: ...5 1 FC 56 J31069 D0155 U001 A0 7618 Sample Applications 5 ...
Page 80: ...Sample Applications 5 18 FC 56 J31069 D0155 U001 A0 7618 ...
Page 90: ...Entry Exit Check of an MDS in an SLG Field 6 10 FC 56 J31069 D0155 U001 A0 7618 ...
Page 94: ...System Configuration 7 4 FC 56 J31069 D0155 U001 A0 7618 ...
Page 100: ...Commissioning Guidelines 8 6 FC 56 J31069 D0155 U001 A0 7618 ...
Page 101: ...9 1 FC 56 J31069 D0155 U001 A0 7618 Error Messages and Trouble Shooting 9 ...
Page 152: ...Programming MOBY ASM on PROFIBUS DP V1 B 30 FC 56 J31069 D0155 U001 A0 7618 ...