ST_IEC870_5_103DataUnit_Ident

ID field of the data unit (ASDU).

TYPE ST_IEC870_5_103DataUnit_Ident:
STRUCT
    eType   : INT(0..255);
    bSQ     : BOOL;
    nObj    : BYTE(0..127);
    eCOT    : INT(0..255);
    asduAddr: BYTE;
    eClass  : E_IEC870_5_101ClassType;
END_STRUCT
END_TYPE

eType: IEC 60870-5-103 ASDU type ID in control direction or ASDU type ID in monitoring direction := < 0..255>.

bSQ: Sequence flag := <FALSE = single, TRUE = sequence>.

nObj: Number of information objects or information elements := <0..127>.

eCOT: IEC 60870-5-103 cause of transfer in control direction or cause of transfer in monitoring direction := <0..255>.

asduAddr: Common ASDU address (CAA, one byte).

eClass: Priority class.