Network; Recommended Design Rules - Danfoss MCA 122 Modbus TCP Operating Instructions Manual

How to Install
2 2
Illustration 2.6 Ring/Redundant Line Topology

2.1.4 Network

It is of high importance that the media chosen for Ethernet
data transmission are suitable. Usually CAT 5e and six
cables are recommended for industrial applications. Both
types of cable are available as Unshielded Twisted Pair and
Shielded Twisted Pair. Shielded cables are recommended
for use in industrial environments and with frequency
converters.
A maximum cable-length of 100 m is allowed between
switches.
Optical fibres can be used for gapping longer distances
and providing galvanic isolation.
For connecting Modbus TCP devices both hubs and
switches can be used. It is, however, always recommended
to use suitable industrial graded Ethernet switches. For
8
MCA 122 Modbus TCP
VLT VLT VLT VLT
AutomationDrive AutomationDrive AutomationDrive AutomationDrive
®
MG90P202 - VLT is a protected Danfoss trademark
½
VLT VLT VLT
AutomationDrive AutomationDrive AutomationDrive
130BA905.10
more information regarding IP-switching, refer to 3.4.1 IP
Traffic.

2.1.5 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 every
switch in the line.
It is not recommended to connect more than 32 frequency
converters in a line at any API. Exceeding the
recommended design rules, may result in failing communi-
cation.