Structure of a CPU 41x
2.12 Overview of the parameters for the S7-400 CPUs
S7-400 Automation System, CPU Specifications
2-26 Manual, 10/2006, 6ES7498-8AA04-8BA0
● Assignment of interrupts, hardware interrupts, time-delay interrupts and asynchronous
error interrupts to the priority classes
● Time-of-day interrupts, for example start, interval duration and priority
● Cyclic interrupts, for example priority, interval duration
● Diagnostics/clock, for example time-of-day synchronization
● Protection levels
● Web
Note
16 memory bytes and 8 counters are set to retentive in the default settings, in other
words, they are not deleted when the CPU is restarted.
Parameter Assignment Tool
You can set the individual CPU parameters using "Hardware Configuration" in STEP 7.
Note
If you make changes to the existing settings of the following parameters, the operating
system initializes the same setting as for a cold restart.
● Size of the process image of the inputs
● Size of the process image of the outputs
● Size of the local data
● Number of diagnostic buffer entries
● Communication resources
This involves the following initializations:
– Data blocks are initialized with the load values.
– Memory bits, timers, counters, inputs and outputs are deleted regardless of the retentivity
setting (0).
– DBs generated by SFC are deleted
– Permanently configured, base communication connections are terminated
– All run levels are initialized.
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