19.4 Denial of service SCHLCCH/RCHLCCH
19.4.1 Application
GUID-64F4D905-9F73-4073-B8F6-8D373155316A v5
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
19.4.2 Setting guidelines
GUID-CE3344E8-539B-47E0-9C19-8239988BDBCF v3
The function does not have any parameters available in the local HMI or PCM600.
1MRK 505 370-UEN D Section 19
Security
Busbar protection REB670 429
Application manual
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