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).