Technical information
8.5 Hardware descriptions
SIMATIC IPC477E
152
Operating Instructions, 11/2020, A5E37455003-AF
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 (read/write, address 062h)
(Page 152)
I/O 066h
Watchdog trigger register (read only, address 066h) (Page 153)
I/O 404Eh
Output register user LED L1/L2/L3 (read/write, address 404Eh) (Page 153)
I/O 50Ch
Battery status register (read-only, address 404Dh) (Page 154)
8.5.4.2
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
Scaler watchdog time (Normal/Macro)
0 0 0
94 ms / 2 s (default)
0 0 1
210 ms / 4 s
0 1 0
340 ms / 6 s
0 1 1
460 ms / 8 s
1 0 0
590 ms / 16 s
1 0 1
710 ms / 32 s
1 1 0
840 ms / 48 s
1 1 1
960 ms / 64 s
Trigger red Watchdog LED
0
Red LED (WD) off
1
Red LED (WD) on
Watchdog error / Display and reset
0
WD inactive
1
WD triggered
Reset LED after watchdog alarm
(Bit 7 = write 1)