ProSoft Technology PLX81-EIP-61850 - Manual (Page 112)

Reference PLX8x-EIP-61850 ♦ Communication Gateway
User Manual Server to
IEC 61850 Client
Page 112 of 167 ProSoft Technology, Inc.
July 2, 2015
5.6.6 Report Control Block BRCB (Clause 14)
Buffered Report Control Block (BRCB)
A Buffered Report Control Block (BRCB) is associated with a DATA-SET. BRCB
data is queued up, or buffered, in the IED, and sent sequentially to the connected
IEC 61850 Client. The size of the buffer is defined by the IED. BRCB is used so
that data is not lost due to communication control or loss of connection. There
are procedures required around the reporting, and the IED may only report to
one Client.
NOTE: Since The Buffered data is eventually sent via EtherNet/IP
communications in this product, only one buffered report is sent, and if multiple
IEC 61850 buffered reports come in during a single RPI time, the last report is
only updated in the EtherNet/IP side of communications.
Unbuffered Report Control Block (URCB)
An Unbuffered Report Control Block (URCB) is associated with a DATA-SET.
URCB data is sent immediately to the connected IEC 61850 Client. If the
transport data flow is not fast enough to support the movement of this data, some
may be lost. The IED can have multiple instances of the URCB data, and
manages the separation of the instances to the IEC 61850 Clients.
5.6.7 GSE (Clause 15)
Peer-to-peer messaging is accomplished with two messages types that are
slightly different. The messages, GOOSE and GSSE, are collectively referred to
as GOOSE. They are accomplished via a publisher / subscriber model. The
difference is that GOOSE data is exchanged via DATA-SET and GSSE provides
a simple list of status information. The gateway supports GOOSE messages. As
an IEC 61850 Client, the ProLinx subscribes to the GOOSE messages published
by the IED. GOOSE messages can help the equipment prevent interlock (the IED
prevents harming the operator or itself).
5.6.8 Control (Clause 17)
There are 5 types of control models defined:
 Status-only
 Direct-with-normal-security
 Select Before Operate SBO-with-normal-security
 Direct-with-enhanced-security
 Select Before Operate SBO-with-enhanced-security
Enhanced Security tends to be used only for high-voltage sites.
SBO includes a Select step, used to check that the control may be valid and to
eventually lock a resource.