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100 m (max) straight-through or crossover
cable. To prevent ground loops, build this cable assembly with a shielded,
metal-enclosed RJ45 connector on one end and an isolated, plastic-enclosed RJ45
connector on the other end. The metal connector end of this cable must be
placed on the switch and not on the PC.
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100 m (max) straight-through or crossover
cable. To prevent ground loops, build this cable assembly with a shielded,
metal-enclosed RJ45 connector on one end and an isolated, plastic-enclosed RJ45
connector on the other end. The metal connector end of this cable assembly can
be placed on either end of the link.
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100 m (max) straight-through or crossover
cable. The shield on the controller's RJ45 connector connects only to a Faraday
cage in the controller; not to the controller's DC ground. Therefore, the RJ45
connectors are floating and the single point of ground is made at the switch to
which the controller is connected. Build this cable assembly with a shielded,
metal-enclosed RJ45 connector on both ends.
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100 m (max) straight-through or crossover
cable. The shield on the WIOC's RJ45 connector connects only to a Faraday cage
in the WIOC; not to the WIOC's DC ground. Therefore, the RJ45 connectors are
floating and the single point of ground is made at the switch to which the WIOC
is connected. Build this cable assembly with a shielded, metal-enclosed RJ45
connector on both ends.
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100 m (max) straight-through or crossover
cable. The shield on the WIOC's RJ45 connector connects only to a Faraday cage
in the WIOC; not to the WIOC's DC ground. Therefore, the RJ45 connectors are
floating and the single point of ground is made at the switch to which the WIOC
is connected. In this figure, the WIOC cards are daisy-chained, so that the
cable shield grounding is passed through from the first switch's shield ground
to the first WIOC's shield ground and then from WIOC to WIOC throughout the
chain. Note that the Primary and Secondary RJ45 shielded connectors are
isolated from each other so there is no ground loop possible between Primary
and Secondary shield grounds. WIOCs are daisy-chained in order to use short
lengths of cable, for example within a cabinet, where the links are protected
against damage. The Cascade port, which is used to create the daisy-chain, is
the bottom port on the WIOC Carrier. It is recommended that for long lengths of
cable, a star-wired connection from each WIOC back to the switch is used. Build
this cable assembly with a shielded, metal-enclosed RJ45 connector on both
ends.
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Enabled cascade ports on the WIOC carrier
are powered by the WIOCs installed in the carrier. If both WIOCs are removed
from a WIOC carrier, enabled cascade ports become unpowered causing loss of
communication to downstream WIOCs. Use redundant WIOCs if cascade ports are
enabled to ensure that the cascade ports are powered and the WIOC is
communicating with downstream WIOCs. Use the WIOC's Properties page in DeltaV
Explorer to enable the cascade ports.
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Any combination of DeltaV RM100, MD30, and
FP20 Smart Switches can be daisy-chained in series up to 12 total.
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If more than one RM100 or MD30 switch is
required to increase port count in an area, use the gigabit uplink ports for
the switch-to-switch connection to provide ample performance headroom on these
aggregating links. 100mbit/s links can also be used for this purpose but
normally those links are reserved for single devices on the edge of the network
such as controllers and workstations. The RM100 and MD30 switches have two
fixed 10/100/1000mbit/s uplink ports and two SFP uplink ports. The SFP ports
can be fitted with optional fiber-optic SFP transceivers for long distance
communications. Only two of the four uplinks in this area of the switch can be
active at a time in any combination of twisted-pair and SFP. Refer to the Smart
Switch Product Data Sheet for available SFP fiber-optic transceivers for the
RM100 and MD30 switches.
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The serial port is not required for
process communications; it is used only for occasional out-of-band switch setup
and management.
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Use a ring tongue terminal to connect the
switch's ground screw to a suitable shield ground. This connection provides a
ground for the twisted-pair, shielded Ethernet connectors.
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