Siemens SIMATIC PCS 7 - Manual (Page 4)

Siemens PLT 112 · 2002 6/4
SIMATIC PCS 7 cabinet design
ET 200M I/O unit
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Overview
Complete ET 200M I/O stations are available for the cabinet
packaging system. The station includes the power supply, com-
ponents for connection to the PROFIBUS-DP fieldbus (electrical
or optical design), selection of modules for hot swapping, and
wiring of load current connections.
The modular ET 200M I/O station with degree of protection IP 20
can be equipped with signal and function modules from the SI-
MATIC S7-300 automation system. These modules must be ad-
ditionally ordered as required.
Power supply
The ET 200M I/O station can be operated with DC 24 V or
AC 120/230 V. With a DC 24 V supply, the I/O station is powered
directly from the cabinet’s power supply assembly, with an
AC 120/230 V supply, a PS 307 power supply module is addi-
tionally required upstream of the IM 153 interface module in the
I/O station in order to convert the AC 120/230 V into DC 24 V. The
DC 24 V input voltage provided by the power supply assembly
or the PS 307 power supply module is used to power the IM 153
and is the load power supply for the I/O modules.
The PS 307 power supply module is available in 5 A and 10 A
versions. The PS 307-1E version with a rated output current of
5 A is standard. If the configuration of the I/O station with
I/O modules results in a higher load, it is recommendable to use
the PS 307-1K with a rated output current of 10 A. Note, howev-
er, that the PS 307-1K width of 200 mm (compared to 80 mm
with the PS 307-1E) means that a maximum of six I/O modules
can be plugged onto the rail.
One fuse is fitted in the power supply assembly for each I/O sta-
tion. With a DC 24 V supply, the IM 153 module and the L+/M-
power supply for I/O modules are fused together.
With an AC 120/230 V supply, the PS 307 power supply module
is fused. The L+/M voltage for the I/O modules is also obtained
from the PS 307.
Hot swapping
When ordering an ET 200M I/O station, it is additionally possible
to order the hot swapping function.
In an I & C system, it may be necessary to replace modules dur-
ing operation for reasons of increased availability. The I/O sub-
system for hot swapping is available for this as a version of the
ET 200M. This version permits replacement of modules without
having to switch off the associated ET 200M subsystem. The
functions of the inserted modules are not affected. The hot
swapping subsystem consists of backplane modules which can
be assembled to form a backplane of the required length, and a
matching mounting rail.
Special bus modules are required for the hot swapping function.
In addition to the PS/IM bus module for the IM 153-1, IM 153-2
and IM 153-3 modules, these are the bus module 2 x 40 for ac-
commodation of two I/O modules with a width of 40 mm each
and the bus module 1 x 80 for accommodation of one module
with a width of 80 mm. Up to four bus modules for I/O modules
can be plugged onto each rail in addition to the PS/IM bus mod-
ule. Bus module covers can be ordered separately for unused
I/O slots.
Ex(i) design
The cable duct with the Ex(i) version is designed as standard in
blue. Ex process cables are routed separately from other cables
in the cable duct. Furthermore, a mechanical separation is re-
quired between the IM 153 module and the first Ex I/O module.
An Ex partition is fitted for the hot swapping function to guaran-
tee the specified insulation distance between intrinsically-safe
and non-intrinsically-safe areas of the ET 200M distributed I/Os.
The DM 370 spacer module is used for this purpose if the hot
swapping function is not required.
Load power supply for I/O modules
The load power supply for the I/O modules is connected via
plugs located above the I/O modules. One plug is provided for
each I/O module. The load power supplies are available in ver-
sions for four or eight I/O modules. With fewer than four or eight
I/O modules, the unused plug connectors are supplied sepa-
rately should subsequent installation of I/O modules become
necessary.
Preparation of quotation, consulting and ordering
Siemens AG
D-76187 Karlsruhe
Tel.: +49 721 595-3776
Fax: +49 721 595-4711
E-mail: [email protected]