Advantech PPC-S123 Uživatelský manuál stáhnout pdf (Strana 144)

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PPC-123 User's Manual

B.1 Programming the Watchdog Timer

To program the watchdog timer, you must write a program which

writes I/O port address 443 (hex). The output data is a time interval

value. The value range is from 01 (hex) to 3E (hex), and the related

time interval is from 1 sec. to 62 sec.

Data Time Interval

01 1 sec.

02 2 sec.

03 3 sec.

04 4 sec.

••

3E 62 sec.

After data entry, your program must refresh the watchdog timer by

rewriting the I/O port 443 (hex) while simultaneously setting it. When

you want to disable the watchdog timer, your program should read I/O

port 443 (hex).

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Advantech PPC-S123 Uživatelský manuál Strana 144