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E xam ple PDQ22 mA
Individual currents can filled the yellow cells near the slaves.2006 PROFIBUS-DP_PowerSupply-via-Bus-Cable_Calculation-Berechnung_05-2006. Define average length the bus line betw een the slaves: 3,0 m
The total length appears the row the master, green cell.xls PROFIBUS. including 10% spare slaves: |
Example: slaves ---> Master the row the 26th slave.
This supply voltage ust not exceed 31,2 volts !
Result: Sum Current
The calculated sum all currents bus line ust not
exceed 4000 (System Limit)!
Number of
Slaves
I
Single Lengths
(can fixed
individually)
Master Slave —
31 Slave —■
30 Slave
29 Slave
28 Slave
27 Slave
26 Slave
25 Slave
24 Slave
23 Slave
I
V
Sum
Bus
Length
I
V
93,0 m
3,0 m
90,0 m
3,0 m
87,0 m
3,0 m
84,0 m
3,0 m
81,0 m
3,0 m
78,0 m
3,0 m
75,0 m
3,0 m
72,0 m
3,0 m
69,0 m
3,0 m
66,0 m
3,0 m
Single Current
(can fixed
individually)
I
V
I mA
Sum
Current
I
i
V
1280 mA
mA 1240 mA
mA 1200 mA
mA 1160 mA
mA 1120 mA
mA 1080 mA
mA 1040 mA
mA 1000 mA
mA 960 mA
mA 920 mA
Voltage on
the Slave
V
23,66 V
23,39 V
2 3,12V
22,85 V
22,60 V
22,36 V
2 2,13V
21,90 V
21,68 V
21,48 V
FieldBusPlug 03.PDP21-FBP
PDP22-FBP
PDQ22-FBP
PROFIBUS DP-V0 FieldBusPlug
PROFIBUS DP-V1 FieldBusPlug
Power Supply via Bus Cable, Calculation (continued)
Calculation procedure
1.
Result: oltage the row the master delivered the power supply,
total Current and total Length.
3.g.
It necessary consider also the max.
2.
Individual length can filled the green cells near the slaves. length the signal lines. Fill current the slaves: mA
The current slave the calculated sum the current consumption
of PDQ22 PDP21 PDP22 and the current consumption of
the connected slaves please find them the accordant technical data
sheet . Define num ber sla e
