PACSystems™ RX3i DNP3 Outstation User Manual
Section 5
GFK-3103B
June 2020
System Operation
70
Note:
1.
The CROB function, Analog Output Value and Point Push Data will be processed by the
ACTIVE Unit only.
2.
A master connected to an RX3i HSB system that uses Redundant IP can experience a bump,
or loss of communication with DNP3 master in the event of a role switch. This is mainly due
to the way the Master and its host Operating system processes the change in end station
whenever the RX3i switches roles. The DNP3 master application as well as the RX3i PLC
application must be developed to withstand a likely bump in the connection during a role
switch and not act inappropriately.
3.
DNP3 redundancy is not available in HSB System when LAN2 is configured with PROFINET
since Redundant IP is not supported.
4.
DNP3 Outstation communication does not start if the redundant IP is not configured in HSB
System.
5.
DNP3 redundancy is not supported on the CPE115.
5.13
Analog Deadband
Users can use the DNP3 Object34
–
Analog Deadband to control the rate of Events generated for the
Analog Input Object30 points. An analog input point may use Deadbands to determine when there is a
change of input value sufficient to be of interest and report an Event for the change. DNP3 Master can
set and report the Analog Deadband value for a given Analog Input point.
When a non-zero Analog Deadband value is set for a given Analog Input point and the absolute value of
the difference between the present value of that point and the value that was most recently queued as
an event for that point, exceeds the Deadband value, then an event is generated.
A Deadband of zero permits any change in the Analog Input value to generate an event, and a
Deadband of the full range of the variable prevents generation of an event.
Example:
Consider an Analog Input point is set with a Deadband value of 100 and current value of that point is
50, and now if the point value changes to 70, then the change in value is not reported as an event to the
master since the absolute difference is not greater than the Deadband value, but the static value of the
point is updated to 70. However, if the point value changes from 70 to 180, then this change in value is
reported to the master, since the difference is greater than the Deadband value set.