ABB DNP 670 Series Communication Protocol Manual

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ABB DNP 670 Series Communication Protocol Manual Manual pdf 24 page image

3.4 Event reporting GUID-881DE1F4-F375-4EE9-88D5-2E227A7A8469 v3The IED supports unsolicited reports. Given the parameters UREvCntThold1,tUREvBufTout1, UREvCntThold2, tUREvBufTout2, UREvCntThold3 andtUREvBufTout3, the IED can be configured to report events either after a number ofevents of a certain class have been generated or when at least one event of the class hasbeen 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 10events/second. If the quota is exceeded the event channel is blocked until the eventchanges is below the quota.3.4.1 Event buffers GUID-01A1D3E8-A9FE-4AB1-82E1-AC374D84AA8E v1Binary input points, double-bit input points, counters and analog input points eachhave buffer sizes of 1000 events.3.5 Command handling GUID-0C671343-CDEE-4030-857B-9B5397F8297D v3DNP3 allows for operation on binary outputs via CROB. Direct Operate, DirectOperate with No Acknowledgement as well as Select/Operate pairs are allowed. Theprotocol requires that a pair of select and operate messages is completely alike andonly one sequence number apart. This in turn requires masters not to send any requestsbetween the selected message and the operate message, otherwise the operate requestwill be denied.Select and Operate requests may contain multiple objects. The select/control buffersize is large enough to hold 10 of the largest select requests possible.3.5.1 Automation bits GUID-BF9E3DA5-6C05-4068-A899-577D121856A5 v1Automation 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 andlengths can be generated, and the outputs from the automation bits component can beconnected to other function blocks in PCM600.3.5.2 Apparatus control GUID-54B13CDA-9165-4130-857E-5D08652B57B8 v4Apparatuses can be controlled via DNP3. Open and close points to SCSWI areavailable 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,Section 3 1MRK 511 391-UUS AVendor-specific implementation18 670 series 2.2 ANSICommunication protocol manual