SIMATIC PCS 7 Process Control System - Siemens

10
Automation systems
Safety-related automation systems
■ Overview
■ Design
In general, two design versions are differentiated across all architectural
levels of a system based on Safety Integrated for
Process Automation:
• Single-channel, non-redundant design
• Redundant, fault-tolerant design
These two design versions are highly variable and offer a wide
scope for design with regard to different customer requirements.
Standard (basic process control) and safety-related functions
can be combined flexibly, not only in the area of distributed I/O.
Single-channel,
non-redundant configuration
Design versions for safety-related systems
10/24
Distributed I/O and
direct fieldbus interfacing
PROFIBUS DP
AS 412F/
AS 414F/
AS 417F
F-modules
ET 200M
F- and standard modules
Standard modules
ET 200M
ET 200M
ET 200S
F- and
standard
modules
DP/PA Link
PROFIBUS PA
Distributed I/O
PROFIBUS DP
Siemens ST PCS 7 · Update November 2008
© Siemens AG 2008
Redundant, high-availability
and fault-tolerant configuration
AS 412FH/
AS 414FH/
AS 417FH
F-modules
Safety-related automation systems are used for critical applications
where a fault could endanger life or result in damage to the
plant or the environment. These F/FH systems frequently referred
to as "fail-safe automation systems" detect both faults in
the process and their own internal faults in association with the
safety-related F modules of the ET 200 distributed I/O systems
or fail-safe transmitters connected directly via the fieldbus. They
automatically transfer the plant to a safe state in the event of a
fault.
Even at the controller level, they can be combined in one system
or separated. In addition, there are numerous possibilities arising
from the use of flexible modular redundancy.
At the individual architectural levels (controller, fieldbus, distributed
I/O) the configuration alternatives shown in the figure are
available depending on the distributed I/O used (ET 200M and
ET 200S remote I/O stations or PROFIBUS PA devices according
to Profile 3.0).
ET 200M
F- and standard modules
Standard modules
ET 200M
F- and standard modules
Y-Link
ET 200M
ET 200M
Module or channel
redundancy over
several separate
stations
ET 200S
Direct fieldbus interfacing
PROFIBUS DP
Flexible Modular Redundancy
at module or device level
AS 412FH/
AS 414FH/
AS 417FH
Active field
splitter
DP/PA Link
PROFIBUS PA
DP/PA Link
with redundant
DP/PA couplers
PROFIBUS PA
DP/PA Link
with redundant
DP/PA couplers
Active field distributors
PROFIBUS PA