Connections Of The Device; Bus Wiring Lon - Camille Bauer EMMOD 205 Mode D'emploi

5. Connections of the device

30 31 32 33 34
Digital input +
Digital output + –
Fig. 5
Symbol Meaning
Device may only be disposed of in a professional
manner!
CE conformity mark. The device fulfi lls the require-
ments of the applicable EC directives.
Products with this mark comply with both the
Canadian (CSA) and the American (UL) requirements
Caution! General hazard point. Read the operating
instructions.
General symbol: Input
General symbol: Output
General symbol: Power supply

6. Bus wiring LON

The most commonly utilized transmission medium for indus-
trial and building management applications is the twisted
pair cable with copper conductors which is used together
with the electrically isolated FTT-10A transceiver. Both ca-
ble conductors can be connected to either terminal which
eliminates the possibility of pole reversal during installation.
Maximum transmission distances depend upon the electrical
characteristics of the cable and network topology. It must
therefore be strictly observed that the utilized cable fulfi lls
the required specifi cations, and that the same cable type is
used throughout any given bus segment in order to prevent
refl ections.
Network topologies:
Bus Network
(bus terminator
at both ends)
Fig. 6
No. 1
B
–
LON
A
Free Topologies
(bus terminator at one end only)
Devices are connected in parallel, one after the other, in bus
networks. A bus terminator must be included at each end.
Wiring with free topologies requires only one bus terminator,
but transmission distances are limited. The EMMOD 205 is
not equipped with an internal bus terminating resistor.
If repeaters are used, the bus signal can be refreshed allowing
for greater transmission distances. Only one passive repeater
may be used within any given bus segment due to time re-
sponse characteristics. Routers are used to enable transfer
to other physical transmission media and/or the targeted
forwarding of data packets to individual bus segments.
Maximum cable lengtsh
Bus Network
(bus terminator
at both ends)
JY (ST) Y 2 x 2 x 0.8 mm 900 m
Level IV, 22AWG 1400 m
Belden 8471 2700 m
Belden 85102 2700 m
Indicated values apply to overall cable length in combination
with the FTT-10A transceiver.
Recommended Cable Type
Wiring is accomplished most cost effectively with a
twisted pair cable with the following specification:
JY (ST) Y 2 x 2 x 0,8 mm. In most cases no shield is required.
Shielding may eliminate communications problems which
occur in environments with high levels of interference. The
specifi cation 0.8 mm refers to the diameter of the conductor,
which results in a cross-section of 0.5 square mm2.
Bus terminators
A switchable bus terminator is frequently included in master
stations which must be set in accordance with the utilized
topology. If a bus network is used, or if repeaters have been
installed, additional bus terminators are required. These are
available as LON accessory component U1164 and are en-
closed in a top-hat rail mounting housing. Each unit includes
a single and a double sided bus terminator.
Double Sided Bus Transfer
100 μF / 50 V
105 Ω ± 1%
100 μF / 50 V
Free Topologies
(bus terminator at one
end only)
500 m
max. 320 m from
device to device
500 m
max. 400 m from
device to device
500 m
max. 400 m from
device to device
500 m
Single Side Bus Transfer
100 μF / 50 V
52.3 Ω ± 1%
100 μF / 50 V
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