Siemens SIMATIC S5-90U System Manual page 344

Integral Real-Time Clock
Possible errors:
- Clock is not
available.
- Clock system data
is incorrect or not
available.
- Clock data area is
too small.
- Clock is defective.
The operating
hours counter
cannot be used.
Correct the errors.
*
The lower part of the flow chart has only a diagnostic function.
There is nothing you must perform.
Figure 13-8. Flowchart - Transferring Settings to the Operating Hours Counter
13-22
Write the settings into
the clock data area
Set transfer bit 10
in the control program
Wait about two seconds
(entering a wait program
yes
Status word
Bit 10=1
no
Status word
Bit 8=1
no
The operating
hours counter
runs with the new
settings.
)
yes
Settings
incorrect
The operating
hours counter
continues to run
with old values.
EWA 4NEB 812 6115-02b
S5-90U/S5-95U
*