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100 m (max) straight-through or crossover
cable. Cat. 5(e) Screened Twisted Pair cable is required between switches.
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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.
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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. 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/link
must be placed on the switch and not on the PC.
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Use a ring tongue terminal to connect the
ground screw of the switch to a suitable shield ground. This connection
provides a ground for the twisted pair Ethernet shielded connectors.
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The type of uplink ports on this switch are
determined by the optional modules chosen. In this example, all MD30 switches
have a gigabit module installed on the left side of the switch that used for
the uplink to the RM100 switch. This module contains two, 10/100/1000mb/s
twisted pair ports and two gigabit SFP slots for various types of optional SFP
transceivers. Only two ports on this module can be used simultaneously in any
mix. The SFP transceivers are available in singlemode and multimode fiber-optic
versions. Each of the remaining six port modules on the right side of the
switch have four 10/100mb/s twisted pair ports for a total of 24 ports and any
combination of ports can be used for 10/100mb/s uplinks to other switches or
for edge devices such as workstations and controllers. Other modules are
available in 100mb/s only communications in single and multimode fiber-optic
versions.
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The type of uplink ports on this switch
consists of two fixed 10/100/1000mb/s ports and two SFP ports. The SFP ports
can be fitted with optional fiber-optic SFP transceivers for long distance
communications. Only two uplinks can be active at a time in any combination of
twisted pair and SFP. Refer to the ordering information for the available SFP
transceivers.
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All twisted pair ports are configured to
autosense speed, autonegotiate duplex, and autodetect polarity. Do not
hard-configure speed or duplex on the twisted pair switch ports or duplex
mismatches, which create communications failures, could occur. Always allow the
switch to autosense speed and autonegotiate duplex. All unused ports of the
switch can be deactivated (locked down) from the Network Device Command Center
(NDCC) after all initial connections are made to the switch. If additional
controllers or workstations need to be connected to unused ports after the
initial lock down, an additional software command from the NDCC is required to
unlock the ports. After the final connections are made, the lock down command
should be reissued to the switch to lock down any remaining unused ports. Once
the ports are in a lock down state, only the original device can communicate on
its original port.
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If more than one RM100 switch is required
to increase port count in an area, use any of the gigabit uplink ports for the
switch-to-switch connection to provide ample performance headroom on these
aggregating links. 100mb/s links can also be used for this purpose but normally
these links are reserved for single devices on the edge of the network such as
controllers and workstations that require much less bandwidth than
switch-to-switch links.
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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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The power connector (not shown) is used for
a +24VDC power supply input and relay contacts.
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This is a 10/100mb/s twisted pair link.
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