Adding Components In Pcs 7 - Siemens SIMATIC S7-400H System Manual
Fault-tolerant systems
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System modifications during operation
17.3 Adding components in PCS 7
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-tolerant system is operating in redundant 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?
1
Modification of hardware
2
Offline modification of the hardware configuration
3
Stopping the reserve CPU
4
Loading a new hardware configuration in the reserve
CPU
5
Switching to CPU with modified configuration
6
Transition to redundant system mode
7
Editing and downloading the user program
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
Note
After 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 Config online help, "Download to module ->
Download station configuration in RUN mode".
286
(Page 294))
See section
PCS 7, step 1: Modification of hardware
(Page 287)
PCS 7, step 2: Offline modification of the
hardware configuration (Page 288)
PCS 7, step 3: Stopping the reserve CPU
(Page 288)
PCS 7, step 4: Loading a new hardware
configuration in the reserve CPU (Page 289)
PCS 7, step 5: Switch to CPU with modified
configuration (Page 289)
PCS 7, step 6: Transition to redundant system
mode (Page 291)
PCS 7, step 7: Editing and downloading the user
program (Page 292)
System Manual, 03/2012, A5E00267695-11
S7-400H
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