Siemens SIMATIC S7-1200 System Manual page 1343

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Restrictions

The following restrictions apply to editing and downloading blocks in RUN mode:

● Extending the block interface by adding new tags and downloading in RUN mode is only

available for optimized blocks (Page 192).

● You cannot change the structure of a block and download the changed block in RUN

mode without reinitializing. Adding new members to a Struct (Page 133) tag, changing

tag names, array sizes, data types, or retentive status all require that you reinitialize the

block if you download it in RUN mode. The only modifications to existing block tags that

you can perform and still download the block in RUN mode without reinitialization are

changes to start values (data blocks), default values (function blocks) or comments.

● You cannot download more new block tags in RUN mode than the memory reserve can

accommodate.

● You cannot download more new retentive block tags in RUN mode than the retentive

memory reserve can accommodate.