Detailed descriptions
16.4 I/O Address Areas
SIMATIC IPC427C
138 Operating Instructions, 04/2009, A5E02414743-01
16.4.2 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 066h is Watchdog trigger register
1 066h is CAN base address register
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)
16.4.3 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).
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