GUID-8C333BC0-AA7A-4ED1-A772-18C22E8EEE62 v6
When CHNGLCK has a logical one on its input, then all attempts
to modify the IED configuration and setting will be denied and the
message "Error: Changes blocked" will be displayed on the local
HMI; in PCM600 the message will be "Operation denied by active
ChangeLock". The CHNGLCK function should be configured so
that it is controlled by a signal from a binary input card. This
guarantees that by setting that signal to a logical zero, CHNGLCK
is deactivated. If any logic is included in the signal path to the
CHNGLCK input, that logic must be designed so that it cannot
permanently issue a logical one to the CHNGLCK input. If such a
situation would occur in spite of these precautions, then please
contact the local ABB representative for remedial action.
20.4 Denial of service SCHLCCH/RCHLCCH
20.4.1 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
20.4.2 Setting guidelines
GUID-CE3344E8-539B-47E0-9C19-8239988BDBCF v3
The function does not have any parameters available in the local HMI or PCM600.
1MRK 505 393-UEN B Section 20
Security
Line differential protection RED650 2.2 IEC 401
Application manual
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