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Daisy Chain Limitations
Here are the limitations of daisy chain connection with
auto-bypass protection enabled.
Read the following statement carefully before
installation.
In general, the maximum cabling distance of each
100BASE-TX network segment is 100 meter. Based
on this limitation, the maximum total connection length
in daisy chain wiring should also be 100m as if auto-
bypass protection active. See the following figure as
example, the distance from first to second module is
50m, so as second to third. When the power fails on
second (middle) module, the auto-bypass will activate to
bridge the network connection. The total distance from
first to the 3rd will become 100m, that means the total
network segment is close to limitation.
Furthermore, for the reason of signal transmission
characteristics, the continuous auto-bypass node should
be less than 2, so that the network communication in
daisy chain wiring is workable.
The purpose of the auto-bypass protection is to help user
minimize the damage situation of module power outage.
Note that when a power outage occurs on ADAM-
6200 modules, there exists around 2.5 seconds buffer
time for internally switching to auto-pass circuit.That
means Ethernet packets can't reach the other devices
by daisy-chaining after this power-down module in
around 2.5 seconds.The valid connection duration after
the auto-bypass function is enabled is at most around
4 days, otherwise, the Ethernet communication will be
interrupted until power is restored.
Startup Manual 2
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