Siemens Welding System ST PCS 7 Manual De Usuario
Automation systems
Safety-related automation systems
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Siemens ST PCS 7 · Update November 2008
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Function
Safety functions
The safety functions of an application are implemented by the
safety-related program executed in the CPU of the F/FH systems
together with the safety-related F-modules of the ET 200 distrib-
uted I/O systems or directly by failsafe transmitters connected
via the fieldbus.
safety-related program executed in the CPU of the F/FH systems
together with the safety-related F-modules of the ET 200 distrib-
uted I/O systems or directly by failsafe transmitters connected
via the fieldbus.
The PROFIsafe profile is used for the safe PROFIBUS DP com-
munication between CPU and process I/O. PROFIsafe expands
the message frames by additional information with which the
PROFIsafe communications partners can recognize and com-
pensate transmission errors such as delays, incorrect se-
quences, repetitions, losses, faulty addressing or data falsifica-
tion.
munication between CPU and process I/O. PROFIsafe expands
the message frames by additional information with which the
PROFIsafe communications partners can recognize and com-
pensate transmission errors such as delays, incorrect se-
quences, repetitions, losses, faulty addressing or data falsifica-
tion.
Standard modules can be used in F/FH systems in addition to
safety-related F-modules - mixed in a remote I/O station or in
separate stations, in a common PROFIBUS segment or in sepa-
rate PROFIBUS segments. Basic process control (BPCS) appli-
cations and safety applications can be automated in such mixed
configurations with one and the same system and configured
with uniform standard tools.
safety-related F-modules - mixed in a remote I/O station or in
separate stations, in a common PROFIBUS segment or in sepa-
rate PROFIBUS segments. Basic process control (BPCS) appli-
cations and safety applications can be automated in such mixed
configurations with one and the same system and configured
with uniform standard tools.
One CPU processes BPCS and safety functions in parallel.
Mutual interference during processing is prevented by ensuring
that the BPCS programs and the safety-related programs are
kept strictly separate and that the data exchange is by means of
special conversion function blocks. The safety functions are pro-
cessed twice in different sections of a CPU by means of redun-
dant, diverse instruction processing. Potential errors are de-
tected by the system during the subsequent comparison of
results.
Mutual interference during processing is prevented by ensuring
that the BPCS programs and the safety-related programs are
kept strictly separate and that the data exchange is by means of
special conversion function blocks. The safety functions are pro-
cessed twice in different sections of a CPU by means of redun-
dant, diverse instruction processing. Potential errors are de-
tected by the system during the subsequent comparison of
results.
The S7 F Systems engineering tool as a component of the
SIMATIC Manager allows parameterization of the F/FH systems
and the safety-related F-modules from the ET 200 series. It sup-
ports configuration by means of functions for:
SIMATIC Manager allows parameterization of the F/FH systems
and the safety-related F-modules from the ET 200 series. It sup-
ports configuration by means of functions for:
• Comparison of safety-related F-programs
• Recognition of changes in the F-program using the checksum
• Separation of safety-related and standard functions.
Access to the F-functions can be password-protected.
The F-block library integrated in S7 F Systems contains pre-
defined function blocks for generation of safety-related applica-
tions with the CFC or the SIMATIC Safety Matrix based on it. The
certified F-blocks are extremely robust and intercept program-
ming errors such as division by zero or out-of-range values. They
avoid the need for diverse programming tasks for detecting and
reacting to errors.
defined function blocks for generation of safety-related applica-
tions with the CFC or the SIMATIC Safety Matrix based on it. The
certified F-blocks are extremely robust and intercept program-
ming errors such as division by zero or out-of-range values. They
avoid the need for diverse programming tasks for detecting and
reacting to errors.
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Options
Ordering information
An AS 412H, AS 414H or AS 417H system is required as the
hardware for a safety-related automation system.
hardware for a safety-related automation system.
The following H systems can be used depending on the type
and structure of the safety-related automation system:
and structure of the safety-related automation system:
• For single-channel AS 412F, AS 414F or AS 417F safety-re-
lated systems: one each of AS 412-3-1H, AS 414-4-1H or
AS 417-4-1H
AS 417-4-1H
• For fault-tolerant and safety-related AS 412FH, AS 414FH or
AS 417FH systems:
- With both subsystems in one rack: one each of AS 412-3-2H,
- With both subsystems in one rack: one each of AS 412-3-2H,
AS 414-4-2H or AS 417-4-2H
- With the two subsystems in different racks: two each of
AS 412-3-1H, AS 414-4-1H or AS 417-4-1H
You require the following components in addition:
• S7 F Systems
F programming tool with F block library for programming
safety-related user programs on the engineering system (see
Chapter "Engineering system")
safety-related user programs on the engineering system (see
Chapter "Engineering system")
• F Runtime license
For processing safety-related user programs, for one
AS 412F/FH, AS 414F/FH or AS 417F/FH system
AS 412F/FH, AS 414F/FH or AS 417F/FH system
• Option: SIMATIC Safety Matrix
The convenient safety lifecycle tool for configuration of opera-
tion and servicing (see Chapter "Engineering system")
tion and servicing (see Chapter "Engineering system")
© Siemens AG 2008