Capacity Planning Of The System Bus - BONFIGLIOLI Vectron Manual

5.14.3
Each PDO telegram possesses a constant useful data content of 8 Bytes. According to
worst case, this results in a maximum telegram length of 140 bits. The maximum tele-
gram run time of the PDO's is thus stipulated via the set baud rate.
As a function of the set baud rate and the transmission interval of the TxPDO's se-
lected, the following bus loads results:
Baud rate
/ kBaud
Attention: A bus load >100% means that a telegram cannot be dispatched com-
This observation must be done for each TxPDO. The sum of all the TxPDO's decides
on the entire bus load. The bus load must be designed in such a way that any tele-
gram repetitions for transmission errors are possible without exceeding the bus capac-
ity.
Note:
50
50

Capacity planning of the system bus

Capacity planning
Baud rate /
kBaud
1000
500
250
125
100
50
Bus load as a function of the transmission for one TxPDO in %
1ms 2ms
14 7
1.000
28 14
500
56 28
250
125 112 56
100 140 70
280 140
50
pletely between two transmission times.
To facilitate capacity planning, a Microsoft Excel file with the name
"Load_Systembus.xls" is available.
Telegram run time /
μs
140
280
560
1120
1400
2800
Capacity of the system bus
3ms 4ms 5ms 6ms
4,7 3,5 2,8
9,3 7 5,6
18,7 14 11,2
37,3 28 22,4 18,7
46,7 35 28 23,3
93,3 70 56 46,7
Such a setting is not admissible!
EM-RES-03
EM-RES-03
7ms 8ms 9ms 10ms
2,3 2 1,8 1,6
4,7 4 3,5 3,1
9,3 8 7 6,2
16 14 12,4
20 17,5 15,6
40 35 31,1
1,4
2,8
5,6
11,2
14
28
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