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█ © Brüel & Kjaer Vibro ● S1079330.002 / V04
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9.1.1 Modbus/TCP Ethernet Port (Also NTP)
The DCS NET port on the SAM is for Modbus/TCP. This port is an
Ethernet port (10/100baseT, using a standard CAT5 or CAT6 cable with
an RJ45 connector).
Normally there is only one Modbus client reading data from the rack; but
(when needed) Modbus TCP does support multiple clients.
Note: The DCS NET port is a dual function port. Normally it is only used
for Modbus TCP; but it can be used for Network Time Protocol (NTP) as
well. Be aware, the port only has a single IP address. When the port is
used for both functions, the two external systems (Modbus TCP, and
NTP) must be on the same network. See more about NTP in section
9.7.2
The maximum length for twisted pair wiring without an interposing switch
is 100 m (328 ft.).
Figure9-2) Modbus TCP port
Figure 9-3) Typical Modbus TCP architecture
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