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1MRK 511 366-UUS -
Commissioning manual
Denial of Service on Communication Ports
The denial of service functions (DOSFRNT, DOSOEMAB and DOSOEMCD) are
designed to limit the CPU load that can be produced by Ethernet network traffic on the
IED. 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.
DOSFRNT, DOSOEMAB and DOSOEMCD measures the IED load from
communication and, if necessary, limit it for not jeopardizing the IEDs control and
protection functionality due to high CPU load. The following outputs are available in ACT
via PCM600 for each DOS function block:
•
LINKUP indicates the Ethernet link status
•
WARNING indicates that communication (frame rate) is higher than normal
•
ALARM indicates the IED limits communication
In addition, it is possible to monitor the status of the communication ports via the Local
HMI under Main menu/Diagnostics/Communication.
As an example, IED front communication port can be monitored via LHMI under Main
menu/Diagnostics/Communication/Front port/DOSFRNT:1.
Section 13
Troubleshooting
175
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