28
Appendix A Points List
PXM 4/6/8K DNP3 Ethernet Communications User Manual
MN150005EN January 2017 www.eaton.com
Figure 19. UP and DOWN Button Function.
5.6 Assigning a Dead Band
PXM DNP implementation uses a fixed dead banding meth-
od for event detection. If a static value of a meter param-
eter changes beyond the assigned dead band limit, then the
event is triggered and stored in the internal event buffer.
Dead band value indicates the number of counts used for
event comparison.
For analog inputs, if a reference value goes above OR
below the dead band limit, then an event is triggered. For
example, if IA is assigned with a dead band value of 10 and
reference value of IA is 500 Amps, then an event will be
triggered in the case of the static value of IA is less than
490 Amps or greater than 510 Amps. When this particular
event is triggered, the value of IA which caused the event
becomes reference for next event comparison.
For binary counters, if the difference/delta between refer-
ence value and current value is greater than the dead band,
then an event is triggered. This is because the counter
value cannot decrement. When an event is triggered, the
value which caused the event becomes reference for the
next event comparison.
For binary inputs, state stage causes an event generation,
therefore it is not required to assign a dead band to the
binary inputs.
Below are limits for different types of event storages in the
PXM meter.
●
●
Analog input change events
500
●
●
Binary input change events
250
●
●
Binary counter input change events
250
●
●
Frozen binary counter change events
250
otee:
N
If the User selects an event class as 0, then the dead
band cannot be programmed. Similarly, if the User
assigns class 1, 2, or 3, then the dead band value
cannot be zero.
