Siemens SIMATIC S7-400H System Manual page 60

Installation of a CPU 41x–H
5.10 Overview of the parameters for the S7-400H CPUs
Parameter assignment tool
You can set the individual CPU parameters using "HW Config" in STEP 7.
Note
When you modify the parameters listed below, the operating system initializes the following
values:
● Size of the process input image
● Size of the process output image
● Size of the local data
● Number of diagnostic buffer entries
● Communication resources
These initializations are:
● Data blocks are initialized with the load values
● M, C, T, I, O will be deleted irrespective of the retentivity setting (0)
● DBs generated by SFC will be deleted
● Permanently configured dynamic connections will be terminated
The system starts up in the same way as with a cold restart.
Further settings
● The rack number of a fault-tolerant CPU, 0 or 1
● The operating mode of a fault-tolerant CPU: Stand-alone or redundant mode
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Use the selector switch on the rear panel of the CPU to change the rack number.
For information on how to change the operating mode of a fault-tolerant CPU, refer to
Appendix B.
System Manual, 09/2007, A5E00267695-03
S7-400H