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Hardware description
A.4 System resources
Meaning of the bits
WDT control register (read/write, address 285h)
Bits
7
x
WDT counter register (read/write, address 286h)
Bits
7
WDT status register (read/write, address 287h)
Bits
7
x
A.4.2.4
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
E300 0000
88
6
5
4
3
0
1
x
x
x
6
5
4
3
00h-FFh
6
5
4
3
x
0
1
x
x
PCI register content:
NVRAM memory address (default)
Address is assigned dynamically (de-
pending on device configuration)
Meaning of the bits
2
1
0
x
Reserved
x
Reserved
x
Reserved
WDT count mode: in seconds
WDT count mode: in minutes
Reserved
Reserved
Reserved
Reserved
Meaning of the bits
2
1
0
Countdown time
Meaning of the bits
2
1
0
x
Reserved
x
Reserved
x
Reserved
Reserved
WDT status: Active
WDT status: Expired
Reserved
Reserved
Reserved
Operating Instructions, 09/2023, A5E53092695-AA
Length of the memory area
80000 h
SIMATIC IPC PX-32A
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