Types Of Watchdog; The Ddfr Internal Watchdog - GE Multilin DDFR Instruction Manual

Distributed digital fault recorder

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CONFIGURING THE DDFR WATCHDOGS

3.4.1

Types of WatchDog

Note

3.4.2

question. Similarly, WatchDog information can be directly transferred to the DDFR and

transferred to the appropriate Settings File - using the Update File from DDFR command,

as shown below.

The DDFR contains three different types of WatchDog, or "health monitor":

Internal (DDFR) WatchDog

Takes corrective action to ensure that the DDFR application is continually running. If the

DDFR application is NOT running for some reason, the Internal Watchdog will attempt to

fix the situation, by, for example, restarting the application.

The Internal Watchdog is not a configurable WatchDog.

DriveSpace WatchDog

Active when the DDFR's used storage space is nearing maximum capacity. Once the used

storage space meets a certain threshold, automated maintenance occurs and the oldest

records deleted.

External WatchDog

Notifies a UR relay that the DDFR is running.

For UR relays, the External Watchdog causes an action to be performed to notify

management of a "DDFR-not-running" situation. In the UR relay, the Internal Watchdog,

discussed above, thus complements the External Watchdog by initially trying to correct the

problem.

Only the frequency of sending "heartbeat" signals is configurable.

This External WatchDog is discussed in detail in section 4.2.2.

The DDFR Internal WatchDog ensures that the DDFR application is continually running. If

the application stops for any reason, the Internal Watchdog causes it to reset. Using the

above "health monitor" idea, the Internal Watchdog is roughly equivalent to trying to cure

the problem with self-medication.

CHAPTER 3: DDFR CONFIGURATION

DISTRIBUTED DIGITAL FAULT RECORDER – INSTRUCTION MANUAL

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