5
PROFINET networks – Recommendations
Maximum line depth
Manual – MOVI-C
®
CONTROLLER progressive UHX65A-M
20
5.2
Maximum line depth
The following table shows the maximum line depth with store and forward switches:
Refresh time
ms
Maximum line depth
1
7
2
14
4
28
8
58
The following table shows the maximum line depth with cut-through switches:
Refresh time
ms
Maximum line depth
1
64
2
100
4
100
8
100
5.3
Network load
The following table shows the generated cyclic real-time network load per PROFINET
device. A PROFINET packet size of 60 bytes and a PROFINET data rate of 100 Mbit/s
is assumed
Refresh time
ms
Network load
%
1
0.86
2
0.43
4
0.22
8
0.11
In order to leave sufficient reserves for extensions and especially for NRT (non-real-
time) communication, observe the following limit values for network load of cyclic real-
time communication when planning the PROFINET network:
Network load
Recommendation
< 20%
No action required.
20% – 50%
Check the planned network load.
> 50%
Reduce the network load.
26881144/EN – 02/2022