Siemens PCS 7 manual ET 200M I/O unit, Power supply, Hot swapping, Exi design, Overview

SIMATIC PCS 7 cabinet design

ET 200M I/O unit

■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: helmut.heib@siemens.com

6/4 Siemens PLT 112 · 2002