E-Mon E-PS-A-RTU-N - Manual (Page 100)

Chapter 4 Power
S O F T W A R E C O N F I G U R I N G C O M M U N I C A T I O N
P R O T O C O L S
100 PowerSmart+ Advanced Power Quality Meter
Parameter Options Default Description
DNP General Options
16-bit AI
Scaling Disabled
Enabled Enabled Allows scaling 16-bit analog input
objects (see description below)
16-bit BC
Scaling x1, x10, x100,
x1000 x1 Allows scaling 16-bit binary counter
objects (see description below)
Re-mapping
Event Points Disabled
Enabled Disabled Allows re-mapping event points starting
with point 0.
SBO Timeout 1 2-30 sec 10 Defines the Select Before Operate
(SBO) timeout when using the Control-
Relay-Output-Block object
Time Sync
Period
2
0-86400 sec 86400 Defines the time interval between
periodic time synchronization requests
Multi Fragment
Interval 50-500 ms 50 Defines the time interval between
fragments of the response message
when it is fragmented
1 The Select Before Operate command causes the device to start a
timer. The following Operate command must be sent before the
specified timeout value expires.
2 The device requests time synchronization by bit 4 in the first octet of
the internal indication word being set to 1 when the time interval
specified by the Time Sync Period elapses. The master should
synchronize the time in the device by sending the Time and Date
object to clear this bit. The device does not send time synchronization
requests if the Time Sync Period is set to 0.
3 The total number of AI, BI and BC change event points may not
exceed 64. When you change the number of the change event
points in the device, all event setpoints are set to defaults
(see Configuring DNP Event Classes below).
Scaling 16-bit AI objects
Scaling 16-bit AI objects allows accommodating native 32-bit analog input readings to 16-
bit object format; otherwise it may cause an over-range error if the full-range value exceeds
a 16-bit point limit.
Scaling is enabled by default. It is not applied to points that are read using 32-bit AI objects.
Refer to the PowerSmart+ Advanced PQM DNP3 Reference Guide for information on the
data point scales and on a reverse conversion that should be applied to the received
scaled values.
Scaling 16-bit Binary Counters
Scaling 16-bit Binary Counters allows changing a counter unit in powers of 10 to
accommodate a 32-bit counter value to 16-bit BC object format.
If the scaling unit is greater than 1, the counter value is reported being divided by the
selected scaling unit from 10 to 1000. To get the actual value, multiply the counter reading
by the scaling unit.
Configuring DNP Class 0
The most common method of getting static object information from the meter via DNP is to
issue a read Class 0 request.
The PowerSmart+ Advanced PQM allows you to configure the Class 0 response by
assigning ranges of points to be polled via Class 0 requests.
To view or change the factory-set DNP Class 0 assignments, select Protocol Setup
from the Meter Setup menu and click on the DNP Class 0 Points tab.