System modifications during operation
17.5 Adding components in STEP 7
S7-400H
System Manual, 03/2012, A5E00267695-11
303
17.5 Adding components in STEP 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
STEP 7. Details of each step are described in a subsection.
Step What to do? See section
1 Modification of hardware STEP 7, step 1: Adding hardware (Page 304)
2 Editing the hardware configuration offline STEP 7, step 2: Offline modification of the
hardware configuration (Page 305)
3 Expanding and downloading OBs STEP 7, step 3: Expanding and downloading
OBs (Page 305)
4 Stopping the reserve CPU STEP 7, step 4: Stopping the reserve CPU
(Page 306)
5 Downloading a new hardware configuration to the reserve
CPU
STEP 7, step 5: Loading a new hardware
configuration in the reserve CPU (Page 306)
6 Switching to CPU with modified configuration STEP 7, step 6: Switch to CPU with modified
configuration (Page 307)
7 Transition to redundant system mode STEP 7, step 7: Transition to redundant
system mode (Page 308)
8 Editing and downloading the user program STEP 7, step 8: Editing and downloading the
user program (Page 309)
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