Siemens SIMATIC S7-400H System Manual page 283

Which components can be modified?
The following modifications can be made to the hardware configuration during operation:
● Adding or removing modules in the central or expansion units (e.g. one-sided I/O
● Adding or removing components of the distributed I/Os such as
● Changing specific CPU parameters
● Changing the CPU memory configuration
● Re-parameterization of a module
● Assigning a module to another process image partition
● Upgrading the CPU version
● Changing the master with only one available redundant link
When you make any modifications, keep to the rules for the configuration of a fault-tolerant
station (see section Rules for the assembly of fault-tolerant stations (Page 33)).
S7-400H
System Manual, 03/2012, A5E00267695-11
module).
NOTICE
Always switch off power before you add or remove IM460 and IM461 interface modules,
external CP443-5 Extended DP master interface modules, and their connecting cables.
– DP slaves with a redundant interface module (e.g. ET 200M, DP/PA link, or Y link)
– One-sided DP slaves (in any DP master system)
– Modules in modular DP slaves
– DP/PA links
– PA devices
Note
No changes to the PROFINET interface at runtime
I/O components that are connected to a PROFINET interface as well as parameters of
the PROFINET interface cannot be modified during operation.
System modifications during operation
17.2 Possible hardware modifications
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