I/O Address Areas; Overview Of The Internal Module Registers; Watchdog Trigger Register (Read Only, Address 066H); Watchdog Enable Register / 066H Select Register (Read/Write, Address 062H) - Siemens SIMATIC IPC477E Operating Instructions Manual

Technical information
8.5 Hardware descriptions
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
I/O 062h
I/O 066h
I/O 50Ch
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
7
146
Input/output unit
Watchdog enable register / 066h select register (Page 146)
Watchdog trigger register (Watchdog enable register bit 2=0), Watchdog trig-
ger register (Watchdog enable register bit 2=1) (Page 146)
Battery status register (read-only) (Page 147)
6 5 4 3 2 1
0
1
0
1
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
Meaning of the bits
0
0 Watchdog circuit disabled
1 Watchdog circuit enabled
Standard
Macro
Reserved
94 ms / 2 s (default)
210 ms / 4 s
340 ms / 6 s
460 ms / 8 s
590 ms / 16 s
Operating Instructions, 12/2016, A5E37455003-AB
Watchdog enable bit (WDE)
Watchdog Mode
066h select register selection
Scaler watchdog time (Normal/Macro)
SIMATIC IPC477E