User's Manual
Siemens PLT 111 · 1999
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Automation systems
General
Automation sys tems
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-
U
high 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).
AS 235 K ES 100 K ES 100 K
ES 100 K
ES 100 K
Further
ES 100 K systems,
max. 4
a Distributed configuration:
AS 235 K automation system,
can be extended by up to eight
ES 100 K extension systems
b Central configuration: AS 235 automation system with
basic and extension cabinets, max 6 extension units
EE Extension unit
GE Basic unit
GE
AS 235
EE1
EE2
EE3
EE4
EE5
EE6
Fig. 3/1 Distributed and central configuration of AS 235 automation systems
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-
U
1)
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.
This catalog is out of date, see note on page 1