D.6
SEL-700G Relay
Instruction Manual
Date Code 20170814
DNP3 Communications
DNP3 in the SEL-700G
TCP/UDP Selection
The Committee recommends the selection of TCP or UDP protocol as per the
guidelines in Table D.4.
DNP3 in the SEL-700G
The SEL-700G is a DNP3 Level 2 remote (outstation) device without dual end
point.
Data Access
Table D.5 lists DNP3 data access methods along with corresponding
SEL-700G settings. You must select a data access method and configure each
DNP3 master for polling as specified.
For a TCP connection, the relay sends out unsolicited messages only if a DNP
Master has already established a session and enabled unsolicited messaging
for that session. However, the relay automatically dials out and sends
unsolicited messages for a serial/modem/UDP connection, as defined by the
settings.
Table D.4
TCP/UDP Selection Guidelines
Use in the case of…
TCP
UDP
Most situations
X
Non-broadcast or multicast
X
Mesh Topology WAN
X
Broadcast
X
Multicast
X
High-reliability single-segment LAN
X
Pay-per-byte, non-mesh WAN, for example, Cellular Digital Packet Data
(CDPD)
X
Low priority data, for example, data monitor or configuration information
X
Table D.5
DNP3 Access Methods
Access Method
Master Polling
SEL-700G Settings
Polled static
Class 0
Set ECLASSBn, ECLASSCn,
ECLASSAn to 0; UNSOLn to No
Polled report-by-
exception
Class 0 occasionally, Class 1,
2, 3 frequently
Set ECLASSBn, ECLASSCn,
ECLASSAn to the necessary event
class; UNSOLn to No
Unsolicited report-
by-exception
Class 0 occasionally, optional
Class 1, 2, 3 less frequently;
mainly relies on unsolicited
messages
Set ECLASSBn, ECLASSCn,
ECLASSAn to the necessary event
class; set UNSOLn to Yes and
PUNSOLn to Yes or No
Quiescent
Class 0, 1, 2, 3 never; relies
completely on unsolicited
messages
Set ECLASSBn, ECLASSCn,
ECLASSAn to the necessary event
class; set UNSOLn and PUNSOLn
to Yes.
NOTE:
Because unsolicited
messaging is problematic in most
circumstances, SEL recommends
using the polled report-by-exception
access method to maximize
performance and minimize risk of
configuration problems.
NOTE:
In the settings below, the
suffix n represents the DNP3 session
number from 1 to 3. All settings with
the same numerical suffix comprise
the complete DNP3 session
configuration.
Содержание SEL-700G Series
Страница 14: ...This page intentionally left blank ...
Страница 22: ...This page intentionally left blank ...
Страница 32: ...This page intentionally left blank ...
Страница 52: ...This page intentionally left blank ...
Страница 106: ...This page intentionally left blank ...
Страница 510: ...This page intentionally left blank ...
Страница 560: ...This page intentionally left blank ...
Страница 578: ...This page intentionally left blank ...
Страница 588: ...This page intentionally left blank ...
Страница 604: ...This page intentionally left blank ...
Страница 634: ...This page intentionally left blank ...
Страница 738: ...This page intentionally left blank ...
Страница 802: ...This page intentionally left blank ...
Страница 816: ...This page intentionally left blank ...