Data in the PROFIBUS-DP messages
7SJ61...7SJ63, 7SJ65, 6MD63 PROFIBUS-DP – Bus mapping
C53000-L1840-B006-02
1-2
Bit variables
(SP/SC, DP/DC)
The offset indicates the byte, which contains the bit value and the
position of bit 0 of the bit variable, e.g. (input message):
Offset Designation of the
SIPROTEC objects
Comments Internal
object no.
0/0 Q0 ON/OFF
OFF
0/1 Q0 ON/OFF
ON
Circuit breaker –
17/4 Fail Ph. Seq. 1 = Failure: Phase Sequence 171
The checkback signal from the circuit breaker (as double-point indi-
cation) is located in data byte 0, bit positions 2
0
(bit 0) and 2
1
(bit 1).
The single-point indication "Fail Ph. Seq.“ is located in byte 17, bit
position 2
4
.
The definitions of data types (single-point indication, double-point
indication, measured value, metered measurand etc.) are contained
in the manual "7SJ61...63, 7SJ65, 6MD63, 7UM61 PROFIBUS-DP -
Communication profile" (ref. to page i).
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