AS and OS expansions
7.1 Changes to the AS configuration
Compendium Part D - Operation and Maintenance (V9.0)
74 Operating Manual, 02/2018, A5E43228948-AA
Each PROFIBUS I/O expansion made during operation reduces the set size incrementally.
At the next scheduled AS STOP, the size of the placeholders can be adjusted to new target
values, as long as it will not violate the system limits for the CPU and PROFIBUS.
Engineering phase Design of the configuration including activation of CiR
capability and setting the CiR reserve according to the
expansions planned until the next downtime.
Via STOP Only required once
Ongoing operation
• Adding new stations/modules using the CiR reserve
• Reassignment of parameters for existing sta-
tions/modules
In RUN As often as desired until
CiR reserve is exhausted
Maintenance down-
Resetting of CiR reserve according to the expansions
planned until the next downtime.
Via STOP Required after every
change to the CiR reserve
Note
The changes to the configuration for a standard AS are only available after the "Enable CiR"
option is set in HW Config for a respective DP master system and after the configuration has
been loaded in STOP operating mode.
Typical cases of configuration changes on a standard AS include:
● Adding a DP slave or PA slave with the next highest bus address.
● Adding a module to the first free slot at the end of a modular station, e.g. ET 200M.
● Reassigning parameters for modules within a modular station, e.g. ET 200M (based on
the functions of the module in use).
● Removing a DP slave or PA slave with the next highest bus address.
● Removing the last configured module in a modular station, e.g. the ET 200M.
You can find an overview of all supported configuration changes in the manual titled
"SIMATIC Process Control System PCS 7 Engineering System"
(https://support.industry.siemens.com/cs/ww/en/view/109746533).
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