Technical specifications
A.1 General technical specifications
S7-1200 Functional Safety Manual
142 Manual, 02/2015, A5E03470344-AA
Data for selecting an actuator
Internal CPU memory retention
● Lifetime of retentive data and data log data: 10 years
● Power down retentive data, Write cycle endurance: 2 million cycles
● Data log data, up to 2 KB per data log entry, Write cycle endurance: 500 million data log
entries
Note
Effect of data logs on internal CPU memory
Each data log write consumes at a minimum 2 KB of memo
ry. If your program writes small
amounts of data frequently, it is consuming at least 2 KB of memory on each write. A better
implementation would be to accumulate the small data items in a data block (DB), and to
write the data block to the data log at les
s frequent intervals.
If your program writes many data log entries at a high frequency, consider using a
replaceable SD memory card.
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