Siemens SIMATICS PCS7 brochure Redundancy, Increasing the plant availability

© Siemens AG 2011

Redundancy

Increasing the plant availability

For the individual telecontrol protocols, reference was already made as to how the availability of telecontrol communication can be increased using redundant transmission paths. How- ever, as a result of seamless integration of the telecontrol technology into the SIMATIC PCS 7 process control system, the redundant design of the telecontrol communication is embed- ded in the redundancy concept of the complete system and must therefore be considered globally.

The example of a SIMATIC PCS 7 process control system with integral telecontrol linking of RTUs on the basis of

SIMATIC PCS 7

OS clients

Terminal bus

Redundant system bus

Control center

SIMATIC PCS 7 TeleControl OS with redundant servers

the IEC 870-5-101/IEC 870-5-104 protocols demonstrates the various possibilities for increasing plant availability:

• Redundant SIMATIC PCS 7 TeleControl OS servers for pro-

cess control of central and widely distributed units and for

archiving

• Redundant system bus for system communication

• Redundant telecontrol communication between control

center and RTUs over two separate transmission paths

• Redundant RTUs on the basis of S7-400H/ S7-400FH con-

trollers for local automation of remote units

• Redundant PROFIBUS for communication between control-

ler and process I/O (I/O modules, process instruments and

devices in the field)

• Redundant process I/O

TCP/IP to serial converter

IEC 870-5-101 redundant

RTU S7-400H

ET 200M redundant with 2 x CP 341

TCP/IP

WAN router

IEC 870-5-104 redundant

RTU
S7-400H
with CP 443
	XX 00274
redundant	PCS7G
ET 200M

It is also possible to implement safety-related functions in the RTU (up to SIL 3) based on the S7-400FH controller and F modules in the ET 200M remote I/O station.

Redundant telecontrol configuration based on the IEC 870-5-101/IEC 870-5-104 protocols

Redundancy 27