Watchdog Trigger Register (Read Only, Address 066H); Battery Status Register (Read-Only, Address 50Ch) - Siemens SIMATIC IPC277E Operating Instructions Manual

Watchdog enable register / 066h select register (r/w address 062h)
0
1
8.5.4.3

Watchdog trigger register (read only, address 066h)

Watchdog trigger register
The watchdog is triggered by a read action (address 066h) by this register. The result of the
read access can be disregarded (i.e., dummy read).
8.5.4.4

Battery status register (read-only, address 50Ch)

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 404Dh)
Bit
7
0
0
1
SIMATIC IPC277E
Operating Instructions, 11/2019, A5E35783335-AE
0
1
6 5 4 3 2 1
0
1
1
Red LED (WD) off
Red LED (WD) on
WD inactive
WD triggered
Reset LED after watchdog alarm
(Bit 7 = write 1)
Meaning
0
CMOS battery capacity is still sufficient.
CMOS battery capacity is exhausted (remaining capacity is
sufficient for approx. one month)
CMOS battery is empty
Technical specifications
8.5 Hardware description
Trigger red Watchdog LED
Watchdog error / Display and reset
123