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CPU Response to Configuration Downloads in RUN Mode

Overview

After the download of a modified configuration, the CPU first performs a

consistency check of your changes. If the result is positive it then evaluates the

affected system data.

This evaluation has a retroactive effect upon operating system functions, e.g.

process image update and user program processing. We shall now discuss these

effects in detail.

The time interval required by the CPU to interpret the system data (as of now

referred to as CiR synchronization time) depends on the volume of I/O bytes at the

affected DP master systems (for details, see below.).

The CPU enters event W#16#4318 in the diagnostics buffer at the start of system

data evaluation,
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