Glossary - Pilz Intern PMC SR6 Manual

Glossary

Glossary
Average Diagnostic Coverage (DC
In accordance with DIN EN ISO 13849-1: Average
diagnostic coverage. Measure for the effectiveness
of diagnostics, which can be determined as a ratio of
the failure rate of detected dangerous failures and
the failure rate of all dangerous failures. It can apply
to the entire system or parts of a safety-related sys-
tem.
B value
10D
In accordance with DIN EN ISO 13849-1: Number of
cycles until 10% of the components have failed dan-
gerously (for pneumatic and electromechanical com-
ponents).
Category
In accordance with DIN EN ISO 13849-1: Classifica-
tion of safety-related parts of a controller regarding
their resistance to faults and their subsequent be-
havior in the event of a fault. A category is attained
through the structure and the arrangement of parts,
their fault detection and/or their reliability. Possible
category designations, i.e. classifications, are B,
1, 2, 3, 4.
Class
In accordance with the German Electrical and Elec-
tronic Manufacturers' Association: Amount of data
sources and sinks with compatible technical data in
terms of test pulses within an interface type.
Common cause failure (CCF)
Failure due to a common cause. In accordance with
DIN EN 61800-5-2: Failure that is the result of one
or multiple events that cause simultaneous failures
of two or more isolated channels in a multi-channel
system and lead to safety function failure.
Data sink (sink)
In accordance with the German Electrical and Elec-
tronic Manufacturers' Association (ZVEI): Receiver
of information from a data source. A data sink fea-
tures an input that is connected to the output of the
source. A data sink can fulfill the requirements of
various interface types at the same time. The term
"data sink" refers to the evaluation of information,
not to the evaluation of the associated test pulses.
Data source (source)
In accordance with the German Electrical and Elec-
tronic Manufacturers' Association (ZVEI): Sender of
information to the data sink. The source features an
output that is connected to the input of the sink. A
source can fulfill the requirements of various inter-
face types at the same time. The term "data source"
refers to the generation of information, not to the
generation of the associated test pulses.
Manual PMC SR6 safety module
1005344-en-US-01
Intern
) Insulated Gate Bipolar Transistor (IGBT)
avg
Interface type
Mean time to dangerous failure (MTTF
Mission time (T
NOR gate
OSSD output
Performance Level (PL)
Power Drive System(Safety Related) (PDS(SR))
Bipolar transistor with insulated gate electrode.
Four-layer semiconductor component that is con-
trolled using a gate and combines the advantages of
bipolar and field-effect transistor. An IGBT is primar-
ily used in power electronics.
In accordance with the German electrical and Elec-
tronic Manufacturers' Association (ZVEI): Standard-
ized interface between senders ("data sources") and
receivers ("data sinks") of signals with specifications
about generation by evaluating the associated test
pulses.
In accordance with DIN EN ISO 13849-1: Expected
value for the average time before dangerous failure
of systems or modules. Statistical value that is de-
termined through trials and empirical values. Does
not claim a guaranteed life span or guaranteed fail-
ure-free time.
)
M
In accordance with DIN EN 61800-5-2: Determined
cumulative length of operation of the PDS(SR) dur-
ing its overall service life.
NOT-OR gate. Gates are binary signal states (0 or
1) of variables connected together by a function. All
gate variants can be realized with the negation NOT
and the operators AND and OR. A NOR gate re-
verses the result of an OR link, i.e. the output vari-
able only has the signal 1 if all input variables supply
a 0 signal.
Output with integrated test pulses. During operation,
the associated devices use short test pulses to
check the function of this output type.
In accordance with DIN EN 13849-1: Measure for
the reliability of a safety function or a component.
The Performance Level is measured on a scale of a
– e (lowest – highest PL). The higher the PL, the
safer and more reliable the function in question is.
The PL can be assigned to a specific SIL. A re-
versed inference from a SIL to a PL is not possible.
In accordance with DIN EN 61800-5-2: Electrical
power drive system with integrated safety function
and adjustable speed that is suited for use in safety-
related applications.
)
D
Pilz | 46