PACiS GTW GTW/EN T/C40, Техническое руководство

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Communication GTW/EN CT/C40
PACiS Gateway Page 7/64
Controlled station failure
If its register key
Send_init_asdu_70
is set to 1 the controlled station shall indicate to the
controlling station that it has initialised by sending a frame indicating End of Initialisation
(ASDU 70) with a Cause of Initialisation (COI) field, which will identify the reason for the
initialisation.
Data Acquisition by Polling
The default for all analogue values shall be reporting as Class 2 data (COT=1, periodic,
cyclic, or COT = 2, BackgroundScan cyclic).
Values returned as Class 2 data do not have a time tag (since they are constantly repeated).
The controlled station may return Class 1 data in response to a Class 2 request if no Class 2
data is available and Class 1 data is awaiting transmission. This is configurable in Registry.
At the controlled station, if a request for Class 2 data is received and no data is available a
negative response, data not available, shall be returned to the controlling Station. The
negative response may be a fixed length frame (FC=9) or the Single Control Character (E5),
which in this case is treated as a NACK.
Normal Acquisition of Events
The default for all status changes are reported as Class 1 data (COT=3, spontaneous).
Values returned as Class 1 data shall have a time tag (either CP24Time2a, or CP56Time2a).
Status changes at the controlled station shall cause the ACD bit to be set in the next Class 1
or Class 2 data response. The controlling station shall respond to ACD set by inserting a
scan for Class 1 (spontaneous) data as the next scan.
The response to a Class 1 data request shall also have the ACD bit set if more Class 1 data
is awaiting transmission. In this case a further scan for Class 1 data shall be scheduled by
the controlling station.
Abnormal Acquisition of Events
At the controlled station, if a request for Class 1 data is received and no data is available an
error should be raised and a negative response, data not available, returned to the
controlling Station. The negative response shall be a fixed length frame (FC=9) or the single
Control Character (E5), which in this case is treated as a NACK.
At the controlling station, if a response to a scan for Class 1 data indicates no data is
available an error shall be raised and scanning returned to Class 2 data requests.
General Interrogation
The GI returns the current status information directly from the Controlled station database.
If register key timetag_in_GI is set to 0 time tags are not used for data items returned as
part of the GI response. if this register key is set to 1 DI and AI are time-tagged.
The GI groups are supported so, these will be set up in the database and each of the (up to
16) groups shall be requested/reported individually.
Synchronisation
Class 1 data can be time-tagged with the 3 bytes time-stamp (CP24Time2a), giving minutes
and milliseconds within the hour, or with the 7 bytes time-stamp (CP56Time2a), giving
minutes and milliseconds within the hours, day, month, year. The format of time-stamp can
be defined, for all class1 data, in configuration.
The invalid bit in the time-stamp is set when the time source is not available.
If its register key
Inhibition_Clock_Synchro
is set to 0 the controlled station reports its change
of hour by sending a clock synchronisation message (ASDU 103) to the controlling station,
as Class 1 data, with a cause of transmission spontaneous (3). If this register key is set to 1
no clock synchronisation message is sent.