Appendix B Watchdog Timer Setting; Watchdog Timer Working Procedure - Nexcom EBC575 Series Manual

The EBC575 series features a watchdog timer that reset the CPU or generates an interrupt if the processor
stops operating for any reason. This feature ensures system reliability in industrial standalone or unmanned
environments.
B.1 Watchdog Timer Working Procedure
The Watchdog Timer (WDT) is a special hardware device that monitors the computer system during normal
operation. The WDT has a clock circuit that times down from a set number to zero. If a monitored item occurs
before the timer reaches zero, the WDT resets and counts down again. If for some reason the monitored
item doesn't occur before the timer reaches zero, the WDT performs an action, such as a diagnostic opera-
tion (rebooting the computer) or generate an NMI.
You must enter timer values into the WDT Configuration Register (Write the control value to the Configura-
tion Port), and clear (read the Configuration Port).
WDT Configuration Port
Watch Dog Timer
WDT Active Time
EBC575 User's Manual

Appendix B Watchdog Timer Setting

F2
Disabled
Enabled
1 second
2 seconds
4 seconds
8 seconds
16 seconds
32 seconds
64 seconds
128 seconds
Table B-1: Watchdog Timer Character and Function
Default at F2
1. Default at disabled
2. Enabled for user's programming
Default at 64 seconds
75 Appendix B