Prerequisites For "Download In Run Mode - Siemens S7-1200 System Manual
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- Operating instructions manual (132 pages) ,
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14.12 Downloading in RUN mode
The "Download in RUN mode" feature allows you to make changes to a program and
download them to your CPU without switching to STOP mode:
● You can make minor changes to your current process without having to shut down (for
example, change a parameter value).
● You can debug a program more quickly with this feature (for example, invert the logic for
a normally open or normally closed switch).
You can make the following program block and tag changes and download them in RUN
mode:
● Create, overwrite, and delete Functions (FC), Function Blocks (FB), and Tag tables.
● Create, delete, and overwrite Data Blocks (DB) and instance data blocks for Function
Blocks (FB). You can add to DB structures and download them in RUN mode. The CPU
can maintain the values of existing block tags and initialize the new data block tags to
their initial values, or the CPU can set all data block tags to initial values, depending on
your configuration settings (Page 808). You cannot download a web server DB (control or
fragment) in RUN mode.
● Overwrite Organization Blocks (OB); however, you cannot create or delete OBs.
You can download a maximum number of twenty blocks in RUN mode at one time. If you
must download more than twenty blocks, you must place the CPU in STOP mode.
If you download changes to a real process (as opposed to a simulated process, which you
might do in the course of debugging a program), it is vital to think through the possible safety
consequences to machines and machine operators before you download.
Note
If the CPU is in RUN mode and program changes have been made, STEP 7 always tries to
download in RUN first. If you do not want this to happen, you must put the CPU into STOP.
If the changes made are not supported in "Download in RUN", STEP 7 prompts the user that
the CPU must go to STOP.
14.12.1
Prerequisites for "Download in RUN mode"
To be able to download your program changes to a CPU that is in RUN mode, you must
meet these prerequisites:
● Your CPU version is V3.0 or later
Note
Your CPU version must be V4.0 or later to modify existing blocks and download the
extended block interface in RUN mode. (Page 808)
● Your program must compile successfully.
● You must have successfully established communication between the programming
device where you are running STEP 7 and the CPU.
804
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
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