Detailed descriptions
16.4 I/O Address Areas
SIMATIC IPC427C
Operating Instructions, 04/2009, A5E02414743-01
141
16.4.6 Battery status tab (read-only, address 50Fh)
The status of the CMOS battery is monitored; the status (two-tier) can be read from the
battery status register.
Meaning of the bits
Battery status register (read-only, address 50Fh)
Bit Description
7 6 5 4 3 2 1 0
0 0 CMOS battery capacity is still sufficient.
1 0 CMOS battery capacity is exhausted (remaining capacity is
sufficient for approx. one month)
1 1 CMOS battery is empty
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