Device Polling Regime

The DNPR driver has Citect.ini parameters that allow event polls to be isolated into classes.

The default behavior is that all event classes are polled each event poll. The EventPollRatioClassx parameters control the ratio for each class to the event poll. A value of zero will turn event polls off for the specified class. A value of 2 would mean an event class happens every 2nd poll period.

Note: The integrity poll asks for the static data for all event classes.

The diagram below shows the relationship between the following Polling Regime Parameters:

EventPollPeriod=60 (seconds)

EventPollRatio=10

Integrity polls are issued every 660 seconds (11 mins)
((EventPollRatio+1)* EventPollPeriod) ----> (10+1)*60 == 660.

EventPollRatioClass1=2

Class 1 polls are issued every second EventPollPeriod from the first module after the integrity poll
(poll every EventPollPeriod* EventPollRatioClass1: 60*2 == 120 seconds).

EventPollRatioClass2=3

Class 2 polls are issued every third EventPollPeriod from the first module after the integrity poll
(poll every EventPollPeriod* EventPollRatioClass2: 60*3 == 180 seconds).

EventPollRatioClass3=0

No class 3 polls will be issued.