ABB Relion 670 Series Applications Manual page 563

1MRK 511 401-UUS F
22.4 Denial of service SCHLCCH/RCHLCCH
22.4.1 Application
The denial of service functionality is 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.
The functions Access point diagnostics function block measure 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 function has the following denial of service related outputs:
• LINKSTS indicates the Ethernet link status for the rear ports (single communication)
• CHALISTS and CHBLISTS indicates the Ethernet link status for the rear ports channel A and B
(redundant communication)
• LinkStatus indicates the Ethernet link status for the front port
22.4.2 Setting guidelines
The function does not have any parameters available in the local HMI or PCM600.
Bay control REC670
Application manual
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Section 22
Security
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GUID-CE3344E8-539B-47E0-9C19-8239988BDBCF v3
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