Siemens SIMATIC S5-115U, User Manual

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S5-115U Manual Integral Real-Time Clock
If the clock data area is located at the end of the individual areas (flags, data block) and if
there is insufficient space for the clock data area, only the actual clock data transferred will be
accomodated in this area.
Settings outside the range are ignored.
• If the clock data is in the nonretentive flag area, all settings, the operating hours counter and
the time of the last RUN/STOP change will be lost after POWER OFF or COLD RESTART!
• Please remember that you can define the location of the clock data area and that the word
numbers in Table 13-3 are relative.
- If your data word area is in a data block and if it does not begin with DW 0 but DW X, you
must add the value X to the word number in Table 13-3.
Example: Your clock data area begins at DW 124. The data for clock time/date are
stored from DW 124 to DW 127.
- If you store the clock data area in the flag area from flag word 0, you must multiply the
word number given in Table 13-3 by a factor of 2 in order to obtain the corresponding
word address.
Example: Store the clock data area in the flags operand area from FW 0 onward. The
operating hours counter data is stored from address FW 244 onward.
If your clock data area does not begin at flag word 0, you must add this value.
EWA 4NEB 811 6130-02b
13-9