Siemens AS 235 appendix General

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Automation systems

General

AS 235 K ES 100 K ES 100 K

ES 100 K	Further
	ES 100 K systems,
	max. 4

ES 100 K

a Distributed configuration:

AS 235 K automation system, can be extended by up to eight ES 100 K extension systems

EE4

GE

AS 235

EE5

EE1

EE6

EE2

EE3

bCentral configuration: AS 235 automation system with basic and extension cabinets, max 6 extension units

EEExtension unit GE Basic unit

Fig. 3/1 Distributed and central configuration of AS 235 automation systems

General

￿The AS 235 automation system is available in three different ver- sions:

• AS 235 cabinet version,

• AS 235 H high-availability cabinet version and

• AS 235 K compact version.

The I/O modules in the AS 235 and AS 235 H automation sys- tems are in 6-Uhigh subracks of the ES 902 packaging system, the extension units, which are only suitable for cabinet installa- tion. A further 6 slots for I/O modules are available in the AS 235 basic unit.

The extension units are first installed in the basic cabinet of the AS 235/AS 235 H systems according to the numbers required for the respective automation task. If the basic cabinet is full, the remaining extension units are accommodated in the extension cabinet.

An AS 235 system can be fitted in this manner with up to 90 I/O modules, an AS 235 H system with up to 91 I/O modules. The number of available I/O slots can be increased to max. 114 (AS 235) or max. 103 (AS 235 H) by using additional ES 100 K extension systems.

In contrast to the AS 235 K automation system, the AS 235 and AS 235 H systems installed in cabinets are primarily designed for central configurations (Fig. 3/1b).

The main selection criterion for the AS 235 H system is its high availability.

The AS 235 K compact version is the smallest operable AS 235 automation system. It is fitted in a 15-U1) high subrack of the ES 902 packaging system (DIN 41494) which in turn is installed in a sheet-steel housing with degree of protection IP 21. The housing is designed for wall mounting.

The basic system of the AS 235 K has 6 slots for I/O modules. Up to 8 independent ES 100 K extension systems can be con- nected, thus increasing the total number of I/O modules to 108.

The ES 100 K extension systems can be installed up to 500 m away from the AS 235 K automation system.

For these reasons, the AS 235 K system is primarily suitable for distributed configurations (Fig. 3/1a) in small and medium-size plants or as a stand-alone system.

1) 1 U corresponds to 44.5 mm.

3/2 Siemens PLT 111 · 1999