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Technical Description
2.5
Hardware Clock
The CP 521 incorporates a hardware clock, which may be provided with battery
backup.
Sthe date (date, month, year) and the time of day (second, minute, hour) can be
output with a message text on the printer. In this way, for example, the time of
failure of a machine can be recorded. The output format for the date and time of
day is defined on the memory submodule in DB 1, parameter block 4 ( 6.3.3).
The clock is read from the control program and can be set with the "FORCE VAR"
programmer function ( 6.7.2).
Otherwise the clock has the default values 1.1.89 12.00.00. on power-up.
The clock must be reset if no battery was plugged in to back-up the CP 521 during
POWER OFF.
A battery can only be changed in the POWER ON state, otherwise the clock data is
lost and the clock must be reset.
2.6
Backup Battery
The battery backs up only the clock data.
In the case of a mains power failure or if the PC is switched off, the clock data is
only retained when a backup battery is inserted in the CP 521-
the battery should only be inserted and changed when the PC is switched on.
Otherwise new clock data must be entered on power-up.
A new lithium battery has a life of at least one year.
Note:
Battery failure is indicated by the yellow LED and signalled to the CPU in byte 0
"Module
status".
C A U T I O N
Lithium batteries cannot be charged. -Danger of explosion!-
Used batteries must be properly disposed of.
2-12
CP 521
GWA 4NEB 812 6030-02b
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