Online and diagnostic tools
15.14 Downloading in RUN mode
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1343
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.
Exchanging a V3.0 CPU for a V4.2 CPU (Page 1571)
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