Watchdog Operation; Controller Memory; Calibration Variables - Danfoss HFX Series Installation And Operation Manual

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Table of Contents

HFX Product Family

10.4

WATCHDOG OPERATION

Watchdogs are present to provide an indication that something has gone wrong. Systems that are

programmable can hang for a number of di erent reasons. One of the most common is the execution of an in nite loop due to a programming logic

error. This type of failure prevents any of the other code from executing. Also, if an unusual number of interrupts arrives during a single cycle of the

loop this can prevent the main loop from having su cient time to execute. Another possibility is a failure in hardware that causes a constant reset.

Each controller has an internal hardware watchdog that is continuously running in the background to monitor

for a system malfunction. This watchdog is not user serviceable and is not visible to the user. It will trigger in the event of a task timeout and can only

be reset through a hard reset of the controller, which means that the user must connect the service tool to the controller, tie PWM 1 & 2 to supply

voltage, and then power up the unit. This will prevent the application code from loading

10.5