User`s guide

19.0 Panel Mount PC 486-0010-01-02
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A p p e n d i x A
Watchdog Timer
Watchdog Timer Setting
After the system stops working for a while, it can be auto-reset by the Watchdog Timer. The integrated
Watchdog Timer can be set up in the system reset mode by program.
Using the Watchdog Function
Start

Un-Lock WDT:
O 2E 87 ; Un-lock super I/O
O 2E 87 ; Un-lock super I/O

Select Logic device:
O 2E 07
O 2F 08

Activate WDT:
O 2E 30
O 2F 01

Set Second or Minute :
O 2E F5
O 2F N N=00 or 08 (See below table)

Set base timer :
O 2E F6
O 2F M=00,01,02,…FF (Hex) ,Value=0 to 255

WDT counting re-set timer :
O 2E F6
O 2F M ; M=00,01,02,…FF (See below table)