Siemens S7-1500 Function Manual page 36

Automation system

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Example:

A STEP 7 program contains an organization block (OB), 20 functions (FC) and a data block

(DB). The OB calls the 20 FCs. All the FCs access the DB. If you change the program code

in one of the FCs, the following load procedure only contains the changed FC. If you change

the data type of a tag in the DB, however, the following load procedure then contains all the

FCs and the DB.

The following figure shows the objects in the load procedure in a preview.

Figure 2-8

Structure and Use of the CPU Memory

Function Manual, 10/2018, A5E03461664-AC

2.6 Memory requirements for downloading software changes

Preview for loading

Memory areas and retentive memory

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