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Section 3
Vendor-specific implementation
3.4
3.4.1
3.5
3.5.1
3.5.2
18
Event reporting
The IED supports unsolicited reports. Given the parameters UREvCntThold1,
tUREvBufTout1, UREvCntThold2, tUREvBufTout2, UREvCntThold3 and
tUREvBufTout3, the IED can be configured to report events either after a number of
events of a certain class have been generated or when at least one event of the class has
been generated and the configured time-span has elapsed.
The event system has a rate limiter to reduce CPU load. Each channel has a quota of 10
events/second. If the quota is exceeded the event channel is blocked until the event
changes is below the quota.
Event buffers
Binary input points, double-bit input points, counters and analog input points each
have buffer sizes of 1000 events.
Command handling
DNP3 allows for operation on binary outputs via CROB. Direct Operate, Direct
Operate with No Acknowledgement as well as Select/Operate pairs are allowed. The
protocol requires that a pair of select and operate messages is completely alike and
only one sequence number apart. This in turn requires masters not to send any requests
between the selected message and the operate message, otherwise the operate request
will be denied.
Select and Operate requests may contain multiple objects. The select/control buffer
size is large enough to hold 10 of the largest select requests possible.
Automation bits
Automation bit signals can be used to interpret and execute the count, on-time and off-
time parameters of a CROB. Thereby pulse trains of different characteristics and
lengths can be generated, and the outputs from the automation bits component can be
connected to other function blocks in PCM600.
Apparatus control
Apparatuses can be controlled via DNP3. Open and close points to SCSWI are
available for mapping in PCM600. These points can then be written to by as CROBs,
thereby opening or closing the breaker. It is important to note that the control model,
1MRK 511 391-UUS A
GUID-881DE1F4-F375-4EE9-88D5-2E227A7A8469 v3
GUID-01A1D3E8-A9FE-4AB1-82E1-AC374D84AA8E v1
GUID-0C671343-CDEE-4030-857B-9B5397F8297D v3
GUID-BF9E3DA5-6C05-4068-A899-577D121856A5 v1
GUID-54B13CDA-9165-4130-857E-5D08652B57B8 v4
670 series 2.2 ANSI
Communication protocol manual
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