User's Manual

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Siemens PLT 111 · 1999

6/4

Bus communication

Design

Fig. 6/6 Connection of a redundant remote bus

(AS 235 / AS 235 K/ AS 235 H)

Redundant remote bus

2 bus converters UI are required to connect an automation sys-

tem to a redundant remote bus. The bus converters are con-

nected

• in the AS 235 system via a cable 6DS9 201-8CA to the N-AS

and the connection distributor AV,

• in the AS 235 H system via a cable 6DS9 201-8FC to both N-AS

and the connection distributor AV, and

• in the AS 235 K system via a cable 6DS8 204-8MB to the N-AS.

When converting/retrofitting, cable combinations together with

the cable 6DS8 201-8.. are possible instead of the above cables

(cf. Fig. 6/6).

Local bus interface modules

Further information on the various interface modules can be

found in Catalog PLT 130 and the following manuals:

• CS 275 bus system C79000-G8076-C6

• N-V.24 coupling of computers from

other manufacturers C79000-G8076-C87

• KSN-S55 / S5-155U programmable controller C79000-G8076-C319

Interface module for

20-m local bus

Type

For connection of the following systems and

devices to the CS 275 plant bus

N-AS

6DS1 223-8AC

AS 235 and AS 235 K automation systems

N-AS

6DS1 223-8AA

AS 235 H automation system

N-BK

6DS1 223-8AB

Bus coupler

N-AT

6DS1 222-1AB10/20

OS 525 / WinCC/TM-OS operator systems,

AT-compatible personal computers,

SIMATIC PC and PG programming devices

N-V.24

6DS1 202-1AB

Computers from other manufacturers via V.24

or 20-mA current loop interface

N-S5

6DS1 206-8AA

1) Discontinued product

SIMATIC S5-155U programmable controllers

N-AS N-AS

Remote bus A

6DS9 201-8CA + 6DS8 201-8..

6DS8 201-8..

6DS9 201-8CA or

6DS8 204-8.. (without AV)

N-AS

Remote bus B

6DS9 201-8FC

with 5 plugs

Connection distributor AV

The connection distributor AV (Order No. 6DS9 207-8AA) has a

vacant plug connection to the redundant 20-m local bus for the

connection of configuring aids (e.g. personal computer with the

PROGRAF AS+ engineering tool). It must be connected to the

local bus via a cable for this purpose.

Bus converter Ul

A bus converter is required to connect individual participants or

a local bus with several participants to a remote bus. It performs

continuous signal conversion between the local bus and the

remote bus or vice versa without intermediate storage. The cou-

pling is inductive and non-reactive.

Possible locations:

• AS 235 and AS 235 H basic cabinet

• AS 235 K basic system

• Remote bus connection unit

• Bus coupler

• Remote bus connection subrack.

See Catalog PLT 130 for detailed information on the bus con-

verter.

Connector board AF "Remote bus"

The remote bus cable is connected to the bus converter via the

connector board AF "Remote bus". The board is provided with a

terminating resistor which can be activated using a jumper. The

resistor is activated in the first and last bus participants.

Fig. 6/7 Redundant remote bus with terminating resistors

Overvoltage protection

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 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 AF.

UI UI UI UI UI UI

AF AF AF AF AF AF

aa a a

e.g. TELEPERM M

cabinet with

AS 235 H

e.g. remote bus

connection unit

(OS 525)

e.g. TELEPERM M

cabinet

Remote bus A

Remote bus B

a Terminating resistor F

(activated by jumper)

This catalog is out of date, see note on page 1