Siemens SIMATIC CPU 410 System Manual page 206

Plant changes during redundant operation - H-CiR
12.7 Permitted changes over PROFIBUS DP
Which distributed components can be modified?
The following changes can be made to the hardware configuration during operation:
● Adding or removing components of the distributed I/O such as
– DP slaves with redundant interface module (for example ET 200M, ET200iSP, DP/PA
– One-sided DP slaves (in any DP master system)
– Modules in modular DP slaves (ET 200M and ET 200iSP)
– DP/PA couplers
– PA devices
● Upgrading to a higher product version or a current version of components used such as
DP-IMs.
Special features
When you use an IM 153-2, active bus modules can only be plugged in if the power supply is
off.
Note
When using redundant I/O that you have implemented as one-sided I/O at the user level
(see section Other options for connecting redundant I/Os (Page 354)), you must take the
following into consideration:
During the link-up and update process following a plant change, the I/O data of the previous
master CPU may be temporarily deleted from the process image until all (changed) I/Os of
the "new" master CPU have been written in full to the process image.
During the first update of the process image after a system modification, you may
(incorrectly) have the impression that the redundant I/O has failed completely or that a
redundant I/O exists. Correct evaluation of the redundancy status is therefore not possible
until the process image has been fully updated.
This does not apply for modules that have been enabled for redundant operation (see
section Connection of two-channel I/O to the PROFIBUS DP interface (Page 80)).
Preparations
To minimize the time during which the fault-tolerant system has to run in solo mode, please
note the following before starting a hardware change:
Modules which are plugged but not configured yet do not have any unwanted influence on
the process.
See also
Rules for H station assembly (Page 30)
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link and Y link)
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC