System modifications during operation
17.3 Adding components in PCS 7
S7-400H
286 System Manual, 03/2012, A5E00267695-11
17.3 Adding components in PCS 7
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 section Editing CPU parameters
(Page 323)).
The fault-tole
rant system is operating in redun
dant system mode.
Procedure
Carry out the steps listed below to add hardware components to a fault-tolerant system in
PCS 7. Details of each step are described in a subsection.
Step What has to be done? See section
1 Modification of hardware PCS 7, step 1: Modification of hardware
(Page 287)
2 Offline modification of the hardware configuration PCS 7, step 2: Offline modification of the
hardware configuration (Page 288)
3 Stopping the reserve CPU PCS 7, step 3: Stopping the reserve CPU
(Page 288)
4 Loading a new hardware configuration in the reserve
CPU
PCS 7, step 4: Loading a new hardware
configuration in the reserve CPU (Page 289)
5 Switching to CPU with modified configuration PCS 7, step 5: Switch to CPU with modified
configuration (Page 289)
6 Transition to redundant system mode PCS 7, step 6: Transition to redundant system
mode (Page 291)
7 Editing and downloading the user program PCS 7, step 7: Editing and downloading the user
program (Page 292)
Exceptions
This procedure for system modification does not apply in the following cases:
● To use free channels on an existing module
● For adding interface modules (see section Adding interface modules in PCS 7
(Page 294))
Note
fter changing the hardware configuration, it is downloaded practically automatically. This
means that you no longer need to perform the steps described in sections PCS 7, step 3:
Stopping the reserve CPU (Page 288) to
PCS 7, step 6: Transition to redundant system
mode (Page 291). The system behavior remains unchanged as already described.
You will find more information in the HW Co
nfig online help, "Download to module ->
Download station configuration in RUN mode".
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