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Special features
● Keep changes to a manageable extent. We recommend that you modify only one DP
● When using an IM 153-2, active bus modules can only be plugged in if the power supply
Preparations
To minimize the time during which the fault-tolerant system has to run in single operation,
perform the following steps before making the hardware change:
● Check whether the CPUs provide sufficient memory capacity for the new configuration
● Always ensure that plugged modules which are not configured yet do not have any
10.3
Adding components
Starting situation
You have verified that the CPU parameters (e.g., monitoring times) match the planned new
program. Adapt the CPU parameters first, if necessary (see Chapter Editing CPU
parameters (Page 155)).
The fault-tolerant system is operating in redundant system state.
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
master and/or a few DP slaves (e.g., no more than 5) per reconfiguration run.
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 268)), you must take the
following into consideration:
Due to the link-up and update process carried out after a system modification, 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 are written 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. So correct evaluation of the redundancy status is 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 Connecting redundant I/O to the PROFIBUS DP interface (Page 68)).
data and user program.
unwanted influence on the process.
System modifications during redundant operation
10.3 Adding components
139
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