Siemens SIMATIC S7-1200 Reference Manual page 5

Load objects to the CPU
The table shows which modifications and which modified blocks you can download in which operating mode.
Very complex programs can prevent downloading in RUN mode. Solution approaches:
• Use a memory card with sufficient capacity.
• Select a CPU with sufficient work memory.
• Reduce the number of modified used blocks, constants, PLC tags or data types.
You can find information about the behavior of the F-CPU for fail-safe blocks in the SIMATIC Safety – Configuring and
Programming manual.
Modifications and blocks
Modified properties of hardware
components
Added hardware components
New/revised text lists
(alarms)
Load number of blocks
Reset work memory (MRES)
New OB
Modified OB: Code modifications,
modification of comments
A5E33284667-AA
S7-300 S7-400
STOP,
STOP constraints in
RUN
STOP,
STOP constraints in
RUN
RUN RUN
RUN (<17) RUN (<57)
STOP STOP
(Reset) (Reset)
RUN RUN
RUN RUN
S7-1200 S7-1500
V4.0 or
higher
STOP STOP
STOP STOP
- RUN
RUN (<21) RUN
STOP STOP
(Reset) (Reset)
STOP RUN
RUN RUN
S7-1200 S7-1200
V1.0 - 2.1 V2.2 - V3.0
STOP STOP
STOP STOP
- -
STOP RUN (<11)
STOP STOP
(Reset) (Reset)
STOP STOP
STOP RUN
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