System Reaction If The Download Process Fails; Considerations When Downloading In Run Mode - Siemens S7-1200 System Manual

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System reaction if the download process fails

During the initial Download in RUN operation, if a network connection failure occurs, STEP 7

displays the following "Load preview" dialog:

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

● Any logic that is conditional on the state of the first scan bit will not be executed until the

● The current values of data blocks (DB) and/or tags can be overwritten.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

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.

next power cycle or transition from STOP to RUN mode. The first scan bit is set only by

the transition to RUN mode and is not affected by a download in RUN mode.

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14.12 Downloading in RUN mode