System modifications during operation
17.4 Removing components in PCS 7
S7-400H
System Manual, 03/2012, A5E00267695-11
295
17.4 Removing 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 mod
ules to be remo
ved and their connected sensors and actuators are no longer of any
significance to the process being controlled. The fault-tolerant system is operating in
redundant system mode.
Procedure
Carry out the steps listed below to remove hardware components from a fault-tolerant
system in PCS 7. Details of each step are described in a subsection.
Step What to do? See section
1 Offline modification of the hardware configuration PCS 7, step 1: Editing the hardware configuration
offline (Page 296)
2 Editing and downloading the user program PCS 7, step 2: Editing and downloading the user
program (Page 297)
3 Stopping the reserve CPU PCS 7, step 3: Stopping the reserve CPU
(Page 298)
4 Loading a new hardware configuration in the reserve
CPU
PCS 7, step 4: Downloading a new hardware
configuration to the reserve CPU (Page 298)
5 Switch to CPU with modified configuration PCS 7, step 5: Switching to CPU with modified
configuration (Page 299)
6 Transition to redundant system mode PCS 7, step 6: Transition to redundant system
mode (Page 300)
7 Modification of hardware PCS 7, step 7: Modification of hardware
(Page 301)
Exceptions
This general procedure for system modifications does not apply to removing interface
modules (see section Removing interface modules in PCS 7 (Page 302)).
Note
After changing the hardware configuration, download takes place 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 298) to PCS 7, s
tep 6: Transition to redundant system
mode (Page 300). Th
e system behavior remains as 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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