Siemens SIMATIC IPC477E - Battery Status Register (Read-Only, Address 50 Ch); NVRAM Address Register

Technical information
8.5 Hardware descriptions
SIMATIC IPC477E
Operating Instructions, 12/2016, A5E37455003-AB
147
Watchdog enable register / 066h select register (r/w address 062h)
1
0
1
710 ms / 32 s
1 1 0 840 ms / 48 s
1
1
1
960 ms / 64 s
Trigger red Watchdog LED
0
Red LED (WD) off
1
Red LED (WD) on
Watchdog error / Display and reset
0
WD inactive
1 WD triggered
Reset LED after watchdog alarm
(Bit 7 = write 1)
8.5.4.4
Battery status register (read-only, address 50Ch)
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 battery 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
8.5.4.5
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