GE Multilin F650 - Communication Profiles; TCP Connection Timing; MMS Protocol; Peer-To-Peer Communication

CHAPTER 7: IEC 61850 PROTOCOL 7.2 IEC 61850 PROFILE FOR F650
GEK-106310-AF F650 DIGITAL BAY CONTROLLER 7-9
between the substation automation system and the substation. At the application level, the substation topology itself and
the relation of the substation structure to the SAS functions (logical nodes) configured on the IEDs can be described. Each
device must provide an SCL file that describes the configuration of itself.
Finally, part 10 defines a testing methodology in order to determine "conformance" with the numerous protocol definitions
and constraints defined in the standard.
7.2.2 Communication profiles
The F650 relay supports IEC61850 server services over TCP/IP. This profile requires the F650 to have an IP address to
establish communications. It is possible to have up to five simultaneous connections.
7.2.3 TCP connection timing
A built-in TCP/IP connection timeout of 30 seconds is employed by the F650 to detect “dead” connections. If there is no
data traffic on a TCP connection for greater than 30 seconds, the connection is aborted by the server. Therefore, when
using IEC61850 reporting, clients should configure report control block items such that an integrity report is issued al least
every 30 seconds. If other MMS data is being polled on the same connection al least once every 30 seconds, this timeout
does not apply.
For firmware version 7.20 or higher, TCP connection timeout is configurable from 120 to 1800 seconds and its default value
is 120 seconds
7.2.4 MMS protocol
IEC 61850 specifies the use of the Manufacturing Message Specification (MMS) at the upper (application) layer for transfer
of real-time data. This protocol has been in existence for a number of years and provides a set of services suitable for the
transfer of data within a substation LAN environment. Actual MMS protocol services are mapped to IEC 61850 abstract
services in IEC 61850-8-1.
The exact structure and values of the supported IEC61850 logical nodes can be seen by connecting to a F650 relay with an
MMS browser, such as “MMS Object Explorer and AXS4-MMS” DDE/OPC server from Sisco Inc.
7.2.5 Peer-to-peer communication
Peer-to-peer communication of a digital state information (remote inputs/outputs) is supported using the IEC61850
GOOSE/GSE services. This feature allows digital points to be exchanged between IEC 61850 conforming devices.
7.2.6 File services
MMS file services are supported to allow transfer of oscillography, event record, or other files from a F650 relay.