Siemens AS 235 Bus configurations, examples, Application Other conditions Connecting cables

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Bus communication

Bus configurations

￿

Bus configurations, examples

Application

Other conditions

Connecting cables

20-m local bus

Small plants

Can only be used in instrumenta-

N1 to N2,

max.

Max. 9 participants possible

tion rooms. The guidelines for

N2 to N3 etc.:

N

1

N

2 . . . .

N

9

Max. 20 m bus cable

earthing and screening must be

6DS8 201-8..

Standard design redundant

observed for the participants on

Front plug on N1:

the local bus.

6DS9 200-8AA

Ensure in particular that the par-

ticipants have the same ground

potential (equipotential bonding,

0-V island).1)

20-m local bus / 4-km remote bus

Large plants

Max. 32 bus converters UI can be

N1 to UI:

6DS8 205-8..

max.

Max. 100 participants possible

used, power distribution subrack

6DS8 204-8.. 2)

3)

N

1

N

2 . . . .

N

8

Max. 4 km remote bus cable

can be used for 2 bus converters

6DS9 201-8FC

UI. The guidelines for earthing

N1 to N2,

and screening must be observed

20-m local bus

N2 to N3 etc.:

for the participants on the local

6DS8 201-8..

bus.

UI

1 ... max. 32

Ensure in particular that the par-

AF

ticipants have the same ground

potential (equipotential bonding,

Remote bus

0-V island).1)

20-m local bus / 4-km remote bus,

Large plants

Max. 32 bus converters UI can be

N1 to UI1 and UI2:

redundant

Max. 100 participants possible

used, power distribution subrack

6DS8 204-8..

can be used for 2 bus converters

6DS9 201-8CA 2)

max.

Max. 4 km remote bus cable

N

N

. . . .

N

UI. The guidelines for earthing

6DS9 201-8FC 3)

1

2

7

and screening must be observed

N1 to N2 or

for the participants on the local

N2 to N3 etc.:

bus.

6DS8 201-8..

UI

AF

... Max. 32 redundant

Redundant remote bus

Ensure in particular that the par- ticipants have the same ground

potential (equipotential bonding, 0-V island).1)

Individual participants on 4-km remote bus

N

UI 1 ... max. 32

AF

Remote bus

Medium-sized plants

Individual participants on remote bus (large distances between individual participants)

Maximum peripheral configura- tion of connected automation sys- tems

Max. 32 participants possible Max. 4 km remote bus cable

Interface module(s) for 20-m local N to UI:	6DS8 205-8..		2)
bus and bus converter in the	6DS8	204-8..
same cabinet or subrack.	6DS9	201-8FC 3)

Power distribution subrack can be used for 2 bus converters UI per cabinet.

Individual participants on 4-km remote bus, redundant

N

UI	Max. 32
	redundant
AF
	Redundant
	remote bus

Medium-sized plants

Individual participants on remote bus (large distances between individual participants)

Maximum peripheral configura- tion of connected automation sys- tems

Max. 32 participants possible Max. 4 km remote bus cable

Interface module(s) for 20-m local	N to UI1 and UI2:
bus and bus converter in the	6DS8 204-8..
same cabinet or subrack.	6DS9 201-8CA 2)
Power distribution subrack can	6DS9 201-8FC 3)
be used for 2 bus converters UI
per cabinet.

1)Exceptions apply to the floating local bus interface modules N-AS and N-AT

2)Alternative with AS 235 as N/N1 and incorporation of connection distributor AV

3)Alternative with AS 235 H as N/N1 and incorporation of connection distributor AV

Siemens PLT 111 · 1999 6/5