Siemens ST PCS 7 Manuel D’Utilisation

 

Siemens ST PCS 7 · November 2007

11

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The SIMATIC PCS 7 process control system offers various pos-

sibilities for connecting I/O devices and for detecting and emit-

ting process signals through sensors and actuators: 
• Analog and digital I/O modules of the SIMATIC S7-400 oper-

ated centrally in the automation system

• ET 200M, ET 200S, ET 200iSP and ET 200pro remote I/O sta-

tions with an extensive range of cost-effective signal and func-

tion modules, connected through PROFIBUS DP to the auto-

mation system (AS)

• Direct AS connection of intelligent, distributed field/process 

devices and operator terminals through PROFIBUS DP/PA (re-

dundant or in hazardous zones 0, 1, 2 or 20, 21, 22 also pos-

sible)

Signal groups of the SIMATIC S7-400 can be operated centrally 

in the automation system and are mainly used in small applica-

tions or systems of limited distributed expansion.
Distributed process I/Os are mainly used nowadays: ET 200 

remote I/Os in conjunction with classical field/process devices 

and HART field devices or intelligent field/process devices di-

rectly on PROFIBUS. Decisive for this are properties such as:
• Modularity and consistency
• Flexible adaptability to the plant structure
• Minimum cabling and engineering requirements
• Low commissioning, servicing and lifecycle costs
• Wide technical bandwidth

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ET 200 in explosive gas and dust atmospheres

1)

Dust atmospheres: installation of components always in an enclosure with IP6x degree of protection.

2)

With 10 A DC standard power supply

3)

Also complies with FM/UL according to Class I Division 2

The diagram shows the various interfacing possibilities for the 

distributed I/Os of SIMATIC PCS 7 with consideration of various 

ambient conditions.

0

1

2

FM/UL

ATEX

ATEX

ET 200M

S7-400

ET 200S

ET 200iSP

SITRANS F

SITRANS P

FM/UL

1)

1)

1)

1)

2)

1) 3)

Ex e, Ex d

Ex i, Ex e, Ex d

Ex i

DUST

GAS

Process control system

Fieldbus
Isolating Transformer

Actuators/
sensors

Actuators/
sensors

Actuators/
sensors 

DP/PA link

Actuators/
sensors

© Siemens AG 2007