User's Manual

Design
Siemens PLT 130
.
1994
3/2
General notes, local range
The CS 275 bus system is physically divided into
-- a local range
up to 20 m (local bus) and
-- a remote range
up to 4 km, or up to 12 km with bus couplers.
Each participant requires a local bus interface module to enable
bus communication, redundant systems such as the AS 235 H
automation system require two modules. These interface mod-
ules convert the various internal system bus interfaces of the
participants into the uniform local bus interface. The transfer
control function for the complete bus is transferred from partici-
pant to participant. This function is also handled by the local
bus interface module of the respective participant which cur-
rently possesses the master function.
The design of the local bus interface modules depends on the
participant system to be connected. Thus the modules e. g. for
connection of the automation systems are of double ”EUROPE”
format, and those for connection of SICOMP industral PCs are of
AT format. In the local range, the local bus interface modules
are connected together into a ”local bus island” using cables.
Systems not belonging to TELEPERM M require additional cou-
pling software to match their internal communication interface to
that of the CS 275 bus system. This software is available,
amongst others, for the connection of personal computers with
MS-Windows or UNIX operating systems, for workstations and
for SIMATIC S5 programmable controllers.
In the remote range, individual participants or complete local
bus islands are connected to the remote bus via inductive bus
couplers UI. Different designs of coaxial cable are available for
the connection depending on the associated mechanical stress.
≤
≤
AS Automation system
AG SIMATIC S5 programmable controller
AV Connection distributor for local bus
N-AT, N-AS,
N-V.24, Interface modules for 20-m local bus
N-S5
OS Operation and monitoring system
UI Bus converter unit
Fig. 3/1 CS 275 bus system, example for interconnection of local bus and
remote bus (non-redundant remote bus); local bus island (left) with 2 commu-
nication subscribers and 4 electric participants.
The local bus is always redundant, the remote bus can be either
single or redundant.
Local range
The transmission is on multi-conductor cables with a max. total
length of 20 m.
Three line signals are used. The data themselves are trans-
mitted sequentially on one data line. A second line transmits the
clock, the third is used for synchronization.
It is necessary to differentiate between electrical participants
and (bus) participants when determining the maximum possible
number of participants. Electrical participants are the local bus
interface modules, the bus converter modules UI and connec-
tion multiplexers AV (for connection of a local bus interface
module).
(Bus) participants are e.g . an AS 215 automation system
(1 electrical par ticipant) or an AS 235 H automation system
(2 electrical participants). Up to 9 electrical participants are
permissible on a local bus. For example, this means $ 7bus
participants for a local bus island connected to a redundant
remote bus via two bus converters UI (cf. Figs. 3/1 and 3/2.)
Depending on their type, the local bus interface modules can be
either floating or non-floating. Certain design guidelines must be
observed when connecting into a local bus island in order to
prevent interferences (also refer to Manual ”TELEPERM M,
Information and Guidelines for Planning, Installation and Opera-
tion”, Order No. C79000-G8076-C417).
AS Automation system
AG SIMATIC S5 programmable controller
AV Connection distributor for local bus
N-AT, N-AS,
N-V.24, Interface modules for 20-m local bus
N-S5
OS Operation and monitoring system
UI Bus converter unit
Fig. 3/2 CS 275 bus system, example for interconnection of local bus and
remote bus (redundant r emote bus); local bus island (left) with 2 communi ca-
tion subscribers and 5 electric participants.
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