Siemens SIMATIC IPC477D - I;O Address Areas; Overview of the Internal Module Registers; Watchdog Trigger Register (Read Only, Address 066 H); Watchdog Enable Register; 066 H Select Register (Read;Write, Address 062 H)

Technical information
8.5 Hardware descriptions
SIMATIC IPC477D, IPC477D PRO
Operating Instructions, 11/2016, A5E31347228-AF
237
8.5.4
I/O Address Areas
8.5.4.1
Overview of the internal module registers
The following addresses are used for the internal registers:
Addresses
Input/output unit
I/O 062h
Watchdog enable register / 066h select register (Page 237)
I/O 066h Watchdog trigger register (Watchdog enable register bit 2=0), Watchdog trig-
ger register (Watchdog enable register bit 2=1) (Page 237)
I/O 50Ch
Battery status register (read-only) (Page 239)
8.5.4.2
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).
8.5.4.3
Watchdog enable register / 066h select register (read/write, address 062h)
Meaning of the bits
Watchdog enable register / 066h select register (r/w address 062h)
Bit
Meaning of the bits
7
6
5
4
3
2
1
0
Watchdog enable bit (WDE)
0
Watchdog circuit disabled
1
Watchdog circuit enabled
Watchdog Mode
0
Standard
1
Macro
066h select register selection
0
Reserved
1