Technical specifications
8.6 Hardware descriptions
SIMATIC IPC427E
Operating Instructions, 09/2017, A5E37454814-AB
123
8.6.4.5
Battery status register (read-only, address 404Dh)
To monitor the status of the CMOS battery, the battery monitoring must be switched on via a
special GPIO register.
The status of the CMOS battery (two-tier) can be read out via the batter status register.
Meaning of the bits
Battery status register (read-only, address 404Dh)
Bit
Meaning
7 6 5 4 3 2 1 0
0 0
CMOS battery capacity is still sufficient.
0 1
CMOS battery capacity is exhausted (remaining capacity is
sufficient for approx. one month)
1 1
CMOS battery is empty
8.6.4.6
NVRAM address register
NVRAM occupies a 512 KB memory address area that can be read via PCI registers.
Meaning of the bits
NVRAM address register
PCI register address:
NVRAM base address regis-
ter
PCI register content:
NVRAM memory address (default)
Length of the memory area
E300 0000
Address is assigned dynamically
(depending on device configura-
tion)
80000 h
