System Reaction If The Download Process Fails; Downloading The Program In Run Mode - Siemens SIMATIC S7 System Manual

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14.11 Downloading in RUN mode
14.11.5

System reaction if the download process fails

During the initial Download in RUN operation, if a network connection failure occurs, a "Load
preview" dialog will result as shown in the figure below.
14.11.6

Downloading the program in RUN mode

Before downloading the program in RUN mode, consider the effect of a RUN-mode
modification on the operation of the CPU for the following situations:
● If you deleted the control logic for an output, the CPU maintains the last state of the
● If you deleted a high-speed counter or pulse output functions which were running, the
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output until the next power cycle or transition to STOP mode.
high-speed counter or pulse output continues to run until the next power cycle or
transition to STOP mode.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05