Siemens Welding System ST PCS 7 User Manual

ET 200iSP distributed I/O

Siemens ST PCS 7 · November 2007

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The ET 200iSP is a modular, intrinsically-safe I/O system in IP30 

degree of protection, and can be configured with up to 

32 electronics 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".

• 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

© Siemens AG 2007