Devicenet, 9technical data, 2 telegram time – Lenze EMF2175IB User Manual
Page 97: 3 maximum bus length
DeviceNet
9
Technical data
9-5
L
BA2175 EN 2.0
9.5.1.2
Telegram time
Telegram times depend on baud rate and telegram length:
Baud rate [kbit/s]
Data length [byte]
Baud rate [kbit/s]
0
2
8
10
5.44
7.36
13.12
20
2.72
3.68
6.56
50
1.09
1.47
2.62
125
0.44
0.59
1.05
250
0.22
0.29
0.52
500
0.11
0.15
0.26
1000
0.05
0.07
0.13
Tab. 9-1
Maximum telegram time in [ms]
The telegram times indicated in the table above are calculated according to the following equation.
This equation allows to calculate any intermediate value t
Tmax
if necessary.
t
T
≤
54.4
+
9.6
⋅
L
D
d
Ü
t
T
= telegram time [ms]
L
D
= telegram length [byte]
d
Ü
= baud rate [kbit/s]
9.5.1.3
Maximum bus length
Depending on the baud rate and the cable used the following bus lengths are possible:
Baud rate [Kbit/s]
Thin cable
Thick cable
125
500 m
250
100 m
250 m
500
100 m
When using both, thick and thin cable types (see
(
^
10-6)
and
(
^
10-7)
) the maximum cable lengths
are to be selected according to the baud rate:
•
125 kbit/s:
L
max
=
L
thick
+
5
⋅
L
thin
•
250 kbit/s:
L
max
=
L
thick
+
2.5
⋅
L
thin
•
500 kbit/s:
L
max
=
L
thick
+
L
thin
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