Siemens ST PCS 7 manual ET 200iSP distributed I/O, 11/30

© Siemens AG 2007

Process I/O

ET 200iSP distributed I/O

Introduction

■Overview ■Design

The ET 200iSP is a modular, intrinsically-safe I/O system in IP30 degree of protection, and can be configured with up to

32electronics modules (4/8-channel). The range of electronics modules covers:

•8-channel digital input module DI, can also be used as counter or frequency meter

•4-channel digital output module DO with external actuator switch-off via High or Low signal (H/L switch-off)

•4-channel analog input modules AI for temperature measure- ments with resistance thermometer or thermocouple

•4-channel analog input modules AI for connection of 2/4-wire transmitters with or without HART functionality

•4-channel analog output module AO for connection of field de- vices with or without HART functionality

The ET 200iSP suitable for gas and dust atmospheres according to the ATEX directive 94/9/EU can be installed directly in the Ex zones 1, 2, 21 or 22 as well as in non-hazardous areas. The in- trinsically-safe sensors, actuators and HART field devices can also be located in zone 0 or 20 if necessary.

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The ET 200iSP consists of the following components:

•Carrier system with terminal modules for prewiring, and also for inserting power supply, interface and electronics modules, mounted on an S7-300 rail

•1 or 2 (redundant) power supply modules PS with pressurized enclosure

•1 or 2 (redundant) IM 152 interface modules for PROFIBUS DP

•Up to 32 electronics modules (4/8-channel) in any combina- tion, including watchdog module

•Terminating module (included in scope of delivery of terminal modules for the PROFIBUS interface)

Assembly is quick and easy:

•Latching of terminal modules onto the S7-300 rail

•Prewiring of process signal cables on the terminal modules using spring-loaded or screw-type connections

•Plugging-in of power supply, interface and electronics mod- ules without the need for additional tools

The maximum number of electronics modules which can be used per station may be limited depending on the current con- sumption of the modules required to solve the automation task. However, up to 16 electronics modules can be used without lim- itation.

If the ET 200iSP is used in a hazardous area, it must be installed in an appropriate Ex housing which at least corresponds to the IP54 degree of protection. Appropriate versions of an IP65 hous- ing are offered in the Section "Stainless steel wall housings".

Exceptional features of the ET 200iSP architecture

•Installation and testing of the wiring is possible in advance without the electronics module

•Isolation of the mechanical and electronic systems, in con- junction with the independent process wiring, permits fast and easy replacement of the electronics modules

•Mechanical coding which is carried out when an electronics module is plugged onto a terminal module for the first time prevents the connection of incorrect replacement modules

•Hot swapping of the power supply modules and electronics modules is possible without a fire certificate

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Siemens ST PCS 7 · November 2007