Basics Of Sinumerik Safety Integrated; Control Category 3 - Siemens SINUMERIK 840D Description Of Functions

2 General Information about Integrated Safety Systems

2.6 Basics of SINUMERIK Safety Integrated

2.6 Basics of SINUMERIK Safety Integrated
2.6.1

Control category 3

General The safety-relevant components of the SINUMERIK 840D control with
SIMODRIVE 611 digital correspond to Category 3 according to EN 954-1.
Table 2-5 Categories of safety-relevant parts of control systems
Cate- Summary of requirements
gory
B The safety-relevant components of machine controls
and/or their protective equipment and components
must be designed, constructed, selected, assembled
and combined in compliance with all applicable
standards such as to be capable of withstanding all
potentially hazardous influences.
1 The requirements of B must be fulfilled. Use of
components and principles that have proven to be
effective in terms of safety.
2 The requirements of B must be fulfilled. Use of
principles that have proven to be effective in terms of
safety.
The safety function(s) must be tested at appropriate
intervals by the machine control.
Note:
The suitability of the measure depends on the
application and type of the machine.
3 The requirements of B must be fulfilled. Use of
principles that have proven to be effective in terms of
safety.
The controls must be designed such that:
a single fault/error in the control system does not
cause a loss of the safety function, and
if it can be implemented in an appropriate way,
individual faults/errors can be detected.
4 The requirements of B must be fulfilled. Use of
principles that have proven to be effective in terms of
safety.
A control system must be designed such that:
a single fault/error in the control system does not
cause a loss of the safety function(s), and
the single fault/error is detected before or as the
safety function is required to take effect. If such a
response cannot be implemented, then the
accumulation of faults/errors must not result in a loss
of the safety function(s).
1): The risk assessment states whether the total or partial loss of the safety function(s) as a result of faults/errors
is acceptable.
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SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
1)
System response
If a fault/error occurs, it can lead to
loss of the safety functions.
As described for category B, but
with a greater safety-relevant
reliability of safety functions.
The occurrence of a fault/error can
lead to a loss in safety functions
in-between tests.
The loss of safety function(s) is
detected in the course of testing.
If the single fault/error occurs, the
safety function always remains
operational.
Some, but not all, faults/errors are
detected.
An accumulation of undetected
faults/errors can lead to a loss of the
safety function(s).
If faults/errors occur, the safety
function always remains
operational.
Faults/errors are detected promptly
enough to prevent any loss of safety
functions.
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11.03
Main principle
for provision
of safety
Selection of
components
Structure-
based
Structure-
based