Siemens SIMATIC IPC PX-39A - NVRAM Address Register

Hardware description
A.5 System resources
SIMATIC IPC PX-39A
114 Operating Instructions, 08/2022, A5E51699601-AA
Meaning of the bits
WDT control register (read/write, address 285h)
Bits
Meaning of the bits
7
6
5
4
3
2
1
0
x
Reserved
x
Reserved
x
Reserved
0
WDT count mode: in seconds
1
WDT count mode: in minutes
x
Reserved
x
Reserved
x
Reserved
x
Reserved
WDT counter register (read/write, address 286h)
Bits
Meaning of the bits
7
6
5
4
3
2
1
0
00h-FFh
Countdown time
WDT status register (read/write, address 287h)
Bits
Meaning of the bits
7
6
5
4
3
2
1
0
x
Reserved
x
Reserved
x
Reserved
x
Reserved
0
WDT status: Active
1
WDT status: Expired
x
Reserved
x
Reserved
x
Reserved
A.5.2.4 NVRAM address register
NVRAM occupies a 512 KB memory address range that can be read via PCI registers.
Meaning of the bits
NVRAM address register
PCI register address:
NVRAM base address register
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