![]() This is a procedure that originated with computer programs, well before pLCs were on the market as described in this atricle: Watchdog timer - Wikipedia, the free. ![]() In your specific case, the watchdog timer is checking whether the Profinet cycle time limits have been exceeded. Although Microsoft released an update to fix major DPC Watchdog issues, the problem can still prevail to this day. Watchdog timers can monitor any scan in a computerized system. It usually results in a memory dump and the dreaded blue screen of death. Large international organisations - especially where a fair degree of local autonomy is allowed - can include national or local branches that are fierce watchdogs while other branches are closer in style to tame industry funded groups. A violation of the DPC Watchdog protocol means that your PC’s watchdog, a utility that monitors for unresponsive programs, has been overwhelmed. While the term is commonly used to describe organisations that are more activist in mobilising public support, some organisations are hard to classify. Watchdog organizations are usually non-profit groups that view their role as critically monitoring the activities of governments, industry, or other organizations and alerting the public when they detect actions that go against the public interest.
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