User's Manual

Design
Siemens PLT 130
.
1994
3/5
Bus components, technical data
Overvoltage pr
otection
The participants connected to the remote bus can be exten-
sively protected against destruction by overvoltages by means
of the coarse and fine overvoltage protection units.
The coarse protection limits high-voltage signals of high power
to the arc voltage. The coarse protection is able to handle brief
peaks in the kA range. It is installed where the remote bus cable
enters the building. The fine protection reduces the residual
voltage which passes the coarse protection down to a value
between the internal conductor and the screen of the remote
bus cable which is harmless for the amplifier of the inductive
coupler in the bus converter . The fine protection 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 explosive atmospheres to
DIN 57 165/VDE 0165, Section 5.6.1. It is also suitable for burial
in the ground. The max. permissible length is 4000 m.
An in-house cable
with smaller outer diameter and smaller per-
missible bending radius can be used indoors. The max. permis-
sible length is 2000 m.
An increased tensile strength up to 25 000 N is possible using a
cable with additional armouring
. If protection against damage
by rodents and mechanical damage is required, the cable with
additional steel-tape armouring should be used.
Connection of remote bus
cables
It may be necessary when using remote bus cables to connect
sections together . The maximum available length of the in-house
cable is 200 m, with all other types of cable 1000 m.
The type of connection depends on the type of cable. Standard
and in-house cables are connected by splicing or by using RF
plugs. The 2 other types of cable can be connected by splicing.
To provide protection against mechanical damage, the connec-
tion should be enclosed in a metal sleeve. The cable armouring
can be electrically connected using a copper cable (e. g. as
additional overvoltage protection) and secured to prevent ten-
sion. The s leeve 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
Data formats Variable
Bus control Distributed (token passing principle)
Data protection Block parity
Hamming distance d =4
Noise i mmunity IEC Recommendation 255-4
Local bus
Number of participants Max. 9
(bus converter UI counts as
participant)
Tranmission rate 250 kbit/s
The transmission rate is increased to
340 kbit/s with autonomous local bu-
ses, i. e. without remote bus coupling
Data transfer rate Up to 2800 analog values/s or
up to 38400 binary values/s or
a corresponding combination
Overall cable length between
participant interface modules
Max. 20 m
Standard cable 12x2x0.22m
2
Signal transmission Unbalanced
Signal level 5V
Signal form 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
Transmission rate 250 kbit/s
Standard cable 2YC (mS) CY 1.6/10-75
(Z2/5) vs sw
Signal form Bipolar current signals
Coupling Inductive, non-reactive
Redundant r emote bus Option
Created with "Chameleon CMYK PDF Creator" for Wolfgang Strozyk at Siemens AG
This catalog is out of date, see note on page 2