Siemens AS 235 appendix Application, Local range

This catalog is out of date, see note on page 1

Bus communication

Application

AS 235, AS 235 H and AS 235 K can only be operated on the CS 275 plant bus, but can also communicate with automa- tion systems and operator systems on the PROFIBUS-TM plant bus via a CS-L2 bridge.

This section only describes bus communication with the CS 275 plant bus. A description of bus communication via the PROFIBUS-TMplant bus can be found in Catalog PLT 112.

When planning TELEPERM M systems with the CS 275 plant bus, please observe the TELEPERM M design guidelines in the manual "Information and guidelines for planning, instal- lation and operation", C79000-G8000-C417 (German) or C79000-G8076-C417 (English).

Application

￿The AS 235, AS 235 H and AS 235 K automation systems are connected together and to other automation systems and oper- ator systems of the TELEPERM M process control system via the CS 275 bus in medium-sized and large plants.

Central process control is carried out using the OS 525 and WinCC/TM-OS operator systems. SIMATIC PC or other AT-com- patible personal computers, PG programming devices and computers from other manufacturers can be connected to the bus system for higher-level tasks.

Sequential transfer of data between the individual participants is in time-division multiplex mode. Participants within a local area or a cabinet group are connected over distances of up to 20 m by a local bus. A remote bus connects distributed systems over distances of up to 4 km.

A redundant design of the bus line increases of the availability of the CS 275 plant bus. The remote bus network can be extended to a maximum length of 3 x 4 km using bus couplers.

￿

Design

UI

The CS 275 bus system consists of

• a local bus which is always redundant and

• a remote bus which can be either of single or redundant

design.

OS 525

-AT

WinCC/TM-OS

N

Remote bus,

max. 4 km

Redundant

UI

UI

local bus,

A

max. 20 m

B

AS

-AS

AS

-AS

AS

-AS

AS

-AS

-AS

AS

-AS

235/K

235/K

235/K

235/K

235H

N

N

N

N

N

N

Fig. 6/1 CS 275 bus system; example of connection of local bus and remote bus, single remote bus

OS 525

-AT

WinCC/TM-OS

N

UI

UI

Redundant

remote bus,

max. 4 km

Redundant

UI

UI

UI

UI

local bus,

A

max. 20 m

B

AS

-AS

AS

-AS

AS

-AS

AS

-AS

-AS

AS

-AS

235/K

235/K

235/K

235/K

235H

N

N

N

N

N

N

Fig. 6/2 CS 275 plant bus; example of connection of local bus and remote bus, redundant remote bus

Local range

4 line signals are used in the local range. The data are transmit- ted sequentially on one data line. A second line transmits the clock, the third is used for synchronization. The fourth line is required to switch over data transmission to channel A or B of the redundant local bus. The wired-OR technique is used with the local bus for coupling.

The interface modules for the local bus have a redundant local bus interface. They are connected together with one cable in which the local bus is redundant.

The max. length of the local bus cable is 20 m.

Front plug		N-AS		N-AS	N-AS
		6DS8 201-8..	S max. 20 m
	6DS8 204-8../		Max. 9 CS 275 modules
	6DS8 205-8../
	6DS9 201-8CA

Fig. 6/3 Local bus coupling between AS 235 and AS 235 K

		AS 235 H
Front		N-AS		N-AS	N-AS
plug
		6DS8 201-8..	S max. 20 m
	6DS8 204-8../		Max. 9 CS 275 modules
	6DS9 201-8CA

Fig. 6/4 Local bus coupling with AS 235 H

6/2 Siemens PLT 111 · 1999