Determing The Memory Requirement In The Simatic - Siemens SIMATIC Ident Function Manual

For moby u, moby d, rf200, rf300
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6.8

Determing the memory requirement in the SIMATIC

The memory resources used in SIMATIC S7 by a MOBY application should normally not
reach the system limits on the PLC. However, if the following conditions occur
simultaneously, the memory requirement must be considered:
● SIMATIC S7 with small memory configuration
● Processing of a large number of RFID channels (readers) on an S7
● Processing of large volumes of data on each Ident channel
The example below shows a configuration for the S7 memory required by FB 45. 20 readers
with 1 KB tag data each are to be processed:
FB 45 (needed once)
Instance DB
Parameter data block (UDT 10)
Command data block (UDT 20)
DB for tag data
Total
In this configuration, a SIMATIC CPU with only 48 KB memory can reach the memory limits
quickly if further programs are also running.
FB 45 for MOBY U, MOBY D, RF200, RF300
Function Manual, 07/2012, J31069-D0166-U001-A4-7618
6.8 Determing the memory requirement in the SIMATIC
Examples/applications
Memory Requirements [KB]
per channel
Total
0,45
9,1
0,1
0,01
0,2
1
1,56
39,2
~8
2
20
79

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