ABB RELION REF615R Manual page 30

Section 4
DNP3 parameters
24
Application layer parameters
App layer confirm When disabled, the protection relay requests application confirmation
to event messages only. When enabled, the protection relay also requests application
confirmations to all application messages sent.
App confirm TO is the application layer confirmation timeout in milliseconds. Application
layer confirmations received from the master after App confirm TO has expired are not
acknowledged by the protection relay. It applies to both solicited and unsolicited events.
App layer fragment is the application layer fragment size in bytes.
Unsolicited mode parameters
UR mode Unsolicited responses mode may be set to enable or disable. If enabled, the
initial unsolicited message is sent when the master opens a connection to the protection
relay, the first time after a protection relay reboot. All other unsolicited response
parameters are irrelevant if UR mode is disabled.
Enabling UR mode on a serial multidrop line is not recommended.
Collisions will result from multiple protection relays reporting concurrent
events. Although the DNP3 application layer will recover, collision
recovery can create significant traffic.
UR retries is the number of times the slave will resend the unsolicited response if it is not
confirmed by the master station.
UR TO is the unsolicited response timeout period in milliseconds. This timeout period
starts after App confirm TO expires. A new unsolicited response is transmitted when UR
TO expires. Application layer confirmations received from the master during the UR TO
period are not acknowledged by the protection relay.
UR offline interval is the unsolicited message offline interval in minutes. Offline interval
starts after the last UR retry. Offline interval never starts when UR retries = 65535
(0xFFFF).
UR Class 1,2,3 Min events are the class 1, 2 or 3 number of events that must accumulate
before they are sent as unsolicited messages, unless the UR Class 1,2,3 TO expires causing
the transmission of the events.
UR Class 1,2,3 TO is the time in ms, that class 1, 2 or 3 events are delayed before being
sent out, unless a count of UR Class 1,2,3 Min events have accumulated causing the
transmission of the events.
Legacy master UR provides compatibility to some older DNP3 masters. When set to
disabled, the slave follows the DNP3 standard, sending its first unsolicited message after
a connection has been established following protection relay reboot. The master is
1MRS240048-IB C
REF615R
Communication Protocol Manual