Output Register User Led L1/L2/L3 (Read/Write, Address 404Eh); Battery Status Register (Read-Only, Address 404Dh) - Siemens SIMATIC IPC427E Operating Instructions Manual

Technical specifications
8.6 Hardware descriptions
8.6.4.4

Output register user LED L1/L2/L3 (read/write, address 404Eh)

Meaning of the bits
The "PC ON/WD" LED flashes yellow to indicate the progress of the BIOS self-test during device
startup. After the BIOS self-test has been completed, the "PC ON/WD" LED lights up
continuously green.
Output register L1/L2/L3 (read/write, address 404Eh)
Bits
15
1
1
0
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
7
0
0
1
104
14 13 12-8 7
1
0
x
1
0
1
1
0
1
xxxx
xx
6 5 4 3 2 1
0
1
1
6 5 4-0
LED L1 / Run/Stop dark (default)
LED L1 / Run/Stop lit yellow
LED L1 / Run/Stop lit green
1 LED L2 / SF dark (default)
x LED L2 / SF lit red
0 LED L2 / SF lit yellow
1 LED L3 / Maint dark (default)
x LED L3 / Maint lit red
0 LED L3 / Maint lit yellow
xxxx Reserved (read/write)
xx
Meaning
0
CMOS battery capacity is still sufficient.
CMOS battery capacity is exhausted (remaining capacity is suffi-
cient for approx. one month)
CMOS battery is empty
Operating Instructions, 02/2021, A5E37454814-AE
SIMATIC IPC427E