Four types of function blocks are available to cover most of the control andsupervision within the bay. These function blocks are interconnected to form a controlfunction reflecting the switchyard configuration. The total number used depends onthe switchyard configuration. These four types are:• Bay control QCBAY• Switch controller SCSWI• Circuit breaker SXCBR• Circuit switch SXSWIThe functions Local Remote (LOCREM) and Local Remote Control(LOCREMCTRL), to handle the local/remote switch, and the functions Bay reserve(QCRSV) and Reservation input (RESIN), for the reservation function, also belong tothe apparatus control function. The principles of operation, function blocks, input andoutput signals and setting parameters for all these functions are described below.14.3.3 Error handlingDepending on the error that occurs during the command sequence the error signal willbe set with a value. Table 397 describes the cause values given on local HMI. Thetranslation to AddCause values specified in IEC 61850-8-1 is shown in Table 398. ForIEC 61850-8-1 edition 2 only addcauses defined in the standard are used, for edition1 also a number of vendor specific causes are used. The values are available in thecommand response to commands from IEC61850-8-1 clients. An output L_CAUSEon the function block for Switch controller (SCSWI), Circuit breaker (SXCBR) andCircuit switch (SXSWI) indicates the latest value of the cause during the latestcommand.Table 397:Values for "cause" signalCausenumberName Description Supported0 None Control action successfully executed X1 Not-supported Given for Cancel request with Direct Control in ReadystateX2 Blocked-by-switching-hierarchyNot successful since one of the downstream Locswitches like in CSWI has the value TRUEX3 Select-failed Cancelled due to an unsuccessful selection (selectservice)X4 Invalid-position Control action is aborted due to invalid switch position(Pos in XCBR or XSWI)X5 Position-reached Switch is already in the intended position (Pos in XCBRor XSWI)X6 Parameter-change-in-executionControl action is blocked due to running parameterchangeX7 Step-limit Control action is blocked, because tap changer hasreached the limit (EndPosR or EndPosL in YLTC)X8 Blocked-by-Mode Control action is blocked, because the LN (CSWI orXCBR/XSWI)is in a mode (Mod) which doesn’t allow anyswitchingXTable continues on next pageSection 14 1MRK502052-UEN BControl706Technical manual
