ABB Relion 650 Series Technical Manual page 576

Section 16
Basic IED functions
16.14.6 Operation principle
Authority status (ATHSTAT) function informs about two events related to the IED and the user
authorization:
• the fact that at least one user has tried to log on wrongly into the IED and it was blocked (the
output USRBLKED)
• the fact that at least one user is logged on (the output LOGGEDON)
Whenever one of the two events occurs, the corresponding output (USRBLKED or LOGGEDON) is
activated.
16.15 Denial of service
16.15.1 Functionality
The Denial of service functions (DOSLAN1 and DOSFRNT) are designed to limit overload on the IED
produced by heavy Ethernet network traffic. The communication facilities must not be allowed to
compromise the primary functionality of the device. All inbound network traffic will be quota
controlled so that too heavy network loads can be controlled. Heavy network load might for
instance be the result of malfunctioning equipment connected to the network.
16.15.2 Denial of service, frame rate control for front port DOSFRNT
16.15.2.1 Identification
Function description
Denial of service, frame rate control
for front port
16.15.2.2 Function block
IEC09000133 V1 EN-US
Figure 296: DOSFRNT function block
570
DOSFRNT
LINKUP
WARNING
ALARM
IEC09000133-1-en.vsd
© Copyright 2011 ABB Power Grids. All rights reserved
IEC 61850 IEC 60617
identification identification
DOSFRNT -
1MRK 506 326-UUS B
GUID-407250CA-0076-41E1-AD2D-434077AC3F1D v3
GUID-09BC0991-6FA3-4137-9B7C-A42D5D60D925 v1
ANSI/IEEE C37.2
device number
-
GUID-F5C2ECFE-460C-4916-8441-3D778672F8B5 v1
Line distance protection REL650
Technical manual
SEMOD158543-4 v4