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Data of the PROFIBUS DP messages
46
SIPROTEC PROFIBUS DP - Bus mapping 6MD662/3/4
C53000-L1840-B011-03
Example
The 100 % values for currents and voltages in a substation are as follows:
I
100 %
= 20 kA and V
PhPh/100 %
= 110 kV
The 100 % value of the real power "
3P1_P
" therefore is:
I
100 %
* V
PhPh/100 %
*
√3
= 3810.5 MW
A metered value "Wp+" (energy flow direction = forward) is created in DIGSI and allo-
cated to "
3P_1P
".
This metered value provides 60000 pulses per hour if, during this time, 100 % of
"
3P_1P
" is present.
One counter impulse therefore corresponds to:
"
3P_1P
"
100 %
/ 60000 imp./h = 3810.5 MW / 60000 imp./h = 0.06351 MWh/imp.
This factor has to be entered in DIGSI in the
Measured value description
as
Conversion factor
and to be used for the conversion of the metered measurand
in the PROFIBUS DP master.
If the PROFIBUS DP master receives e.g. the value 43768 then this corresponds to:
43768 imp. * 0.06351 MWh/imp. = 2779.6 MWh
Restore trigger
mode
The
Restore trigger
mode (cyclic, with or without erasing) and
Time interval
must be set for the counters with DIGSI.
For transmitting counters via PROFIBUS DP the following is recommended:
•
Restore trigger
: cyclic,
•
Restore type
: without deleting,
•
Time interval
: 1 min.
2.3.3.2
Impulse counters
Scaling of the counter values derived via binary input (impulse counters) is dependent
on the external source of the impulses.
Note:
Refer to the 6MD662/3/4 device manual for further information regarding configura-
tion of the counters.
Summary of Contents for 6MD662
Page 6: ...Preview 6 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...
Page 8: ...Revision index 8 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...
Page 12: ...Table of contents 12 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...
Page 72: ...Standard mapping 3 2 72 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...
Page 86: ...Index 86 SIPROTEC PROFIBUS DP Bus mapping 6MD662 3 4 C53000 L1840 B011 03 ...