GE Industrial Solutions AF-650 GP PROFINET - Manual (Page 14)

3.1.6 Recommended Design Rules
While designing Ethernet networks special attention and caution must be taken regarding active network components.
While designing a network for line topology it is important to notice that a small delay is added with each switch in the
line.
It is not recommended to connect more than 32 drive in a line. Exceeding the recommended design rules, may result in
unstable or faulted communication.
Illustration 3.7
How to Install PROFINET Operating Instruction
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