Design
Siemens PLT130
.
1994
3/5
Bus components, technical data
Overvoltage protection
The participants connected to the remot e bus can be exten-
sively protected against destructi onby ov ervoltages by means
of the coarse and fine overvol tage protection units.
The coarse protection limits high -voltage signals of high power
to the arc voltage. The coarse protection i s able to handle brief
peaks in the kA range. It is installed where the remote bus cable
enters the building. The fine protect ion reduces the residual
voltage which passes the coarse prot ection down to a value
between the internal conductor and the s creen of the remote
bus cable which is harmless for the amplifier of t he inductive
coupler in the bus converter. The fine protect ion is fitted on the
connector board AF.
Remote bus cable
Standard coaxial cable is used as the remote bus cable. This
may be routed in potentially expl osive atmospheres to
DIN 57 165/VDE 0165, Section 5.6.1. It is also suitable for buri al
in the ground. The max. permiss ible length is 4000 m.
An in-house cable with smaller outer diamet er ands maller per-
missible bending radius can be used indoors. The max. permi s-
sible length is 2000 m.
An increased tensile strength up to 25 000 N i s possible using a
cable with additional armouring . If protection against damage
by rodents and mechanical damage is required, the cabl e with
additional steel-tape ar mouring should be used.
Connection of remote bus cables
It may be necessary when us ing remote bus cables to connect
sections together. The maximum availabl e length of the in-house
cable is 200 m, with all other ty pes of cable 1000 m.
The type of connection depends on the type of cabl e. Standard
and in-house cables are connected by splicing or by using RF
plugs. The 2 other types of cable can be connect ed by splicing.
Toprovide protect ion against mechanical damage, the connec-
tion should be enclosed in a metal s leeve. The cable armouring
can be electrically connected using a copper cable (e. g. as
additional overvoltage protecti on) and secured to prevent ten-
sion. Thesleeve is filled with sealing compound following as-
sembly. All parts required can be obtained as a parts kit for
splicing coaxial cables.
Technical data
Number of participants $100, dependent on bus loading
Distance without bus coupler Max. 4000 m
Datafor mats Variable
Bus control Distributed (token passing principle)
Dataprotection Blockp arity
Hammingd istance d=4
Noise immunity IECRecommendation 255-4
Localbus
Number of participants Max. 9
(bus converter UI counts as
participant)
Tranmissionrate 250k bit/s
Thetr ansmission rate is increased to
340k bit/s with autonomous local bu-
ses, i. e. without remoteb us coupling
Datatr ansfer rate Up to 2800 analog values/s or
up to 38400 binary values/s or
acor responding combination
Overall cable length between
participant interfa ce modules Max.20 m
Standard cable 12x2x0.22m
2
Signaltr ansmission Unbalanced
Signallevel 5V
Signalform Unipolar
Coupling Open collector
Redundant local bus Standard
Remote bus
Number of converters (UI) Max . 32
Number of bus couplers Max. 7,
max. 2 between 2 communication
subscribers
Transmissionrate 250 kbit/s
Standard cable 2YC (mS) CY 1.6/10- 75
(Z2/5) vs sw
Signalform Bipolar current signals
Coupling Inductive, non-reactive
Redundant remoteb us Option
Created with "Chameleon CMYK PDF Creator" for Wolfgang Strozyk at Siemens AG
This catalog is out of date, see note on page 2