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APPENDIX E
E.3.3.1 TRANSMISSION MODE FOR APPLICATION DATA (PACKING AND ORDER OF TRANSPORT OF DATA FIELD)
The way of presenting data elements usually follows the requirements of intended functional applications of the data
contents. Thus numbers are usually presented as we are used to write and read them, namely from left to right with
decreasing powers of their bases.
Sizes of Information elements that are not multiples of 8 bits allow condensed packing of sequences of information
elements to achieve octet structures of the information field.
For information elements longer than on octet, the octet noted a the top is delivered first for transportation in mode 1 or is
delivered last in mode 2. The choice of modes is specified in the application profile used.
E.3.3.2 COMMON ADDRESS OF ASDU
The fourth octet of the DATA UNIT IDENTIFIER of the ASDU defines the COMMON ADDRESS OF ASDU. This octet
shall normally be identical to the station address used at the link level. Exceptions are only permitted where additional
COMMON ADDRESSES OF ASDUs are required on the same physical link because of duplicated functions, for example
two over current protection functions within a transformer differential protection.
COMMON ADDRESS OF ASDU
With
<0..254> :=station address
<255> :=global address
System co-ordinated functions need only use the COMMON ADDRESS OF ASDU which is identical to the link layer
address.
X
E.3.3.3 SELECTION OF STANDARD INFORMATION NUMBER IN MONITOR DIRECTION
The second number octet of the INFORMATION OBJECT IDENTIFIER defines the INFORMATION NUMBER within a
given FUNCTION TYPE. The full range <0..255> is used independently in the control direction as well as in monitor
direction.
INFORMATION NUMBER:=
a) SYSTEM FUNCTIONS IN MONITOR DIRECTION.
b) STATUS INDICATIONS IN MONITOR DIRECTION
GEK-106237P
:= UI8 [1...8] <0..255>
One common address of ASDU (identical with station address)
More than one common address of ASDU
UI8 [1...8] <0..255>
INF
SEMANTICS
X
<0>
End of general interrogation
X
<0>
Time Synchronization
X
<2>
Reset FCB
X
<3>
Reset CU
X
<4>
Start/restart
X
<5>
Power on
INF
X
<16>
MIFII Digital Feeder Relay
SEMANTICS
Auto-recloser active
E.3 IEC 60870-5-103
E.3.3 APPLICATION LAYER
E-7
E
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