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:
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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