B Glossary - Festo CMMP-AS-Series-M0-STO Manual

B Glossary
B Glossary
Term/abbreviation
Cat.
CCF
DC avg
Emergency off
Emergency stop
FCT
HFT
MTTFd
OSSD
PFD
PFH
PL
Safety switching
device
SFF
SIL
SIL CL
STO
T
Tab. B.1 Terms and abbreviations
Festo – GDCP-CMMP-AS-M0-S1-EN – 1412a – English
Description
Safety category in accordance with EN ISO 13849-1, Stages 1-4.
Common Cause Failure in accordance with EN ISO 13849-1.
Average Diagnostic Coverage in accordance with IEC 61508 and
EN 61800-5-2.
In accordance with EN 60204-1: Electrical safety in case of emergency by
switching off the electrical energy to all or part of the installation.
EMERGENCY STOP is to be used where a risk of electric shock or other
electrical risk exists.
In accordance with EN 60204-1: Functional safety in an emergency by
bringing a machine or moving parts to a standstill.
EMERGENCY STOP is used to stop a process or a motion if this creates a
danger.
Festo Configuration Tool, software for configuration and commissioning.
Hardware Fault Tolerance in accordance with IEC 61508.
Mean Time To dangerous Failure: Time in years until the first dangerous
failure occurs with 100 % probability, in accordance with EN ISO 13849-1.
"Output Signal Switching Device": Output signals with 24 V cycle rates for
error detection.
Probability of Failure on Demand in accordance with IEC 61508.
Probability of Dangerous Failures per Hour in accordance with IEC 61508.
Performance Level as per EN ISO 13849-1: Stages a ... e.
Device for executing safety functions or restoring the machine to a safe
status after the power supply to dangerous machine functions has been
switched off. The desired safety function is achieved only in combination with
other measures, although switch-off can occur on a motor controller, for
example.
Safe Failure Fraction [%], ratio of the failure rates of safe and dangerous (but
recognisable) failures to the sum of all failures in accordance with IEC 61508.
Safety Integrity Level, discrete stages for defining the requirements for the
safety integrity of safety functions in accordance with IEC 61508 and
EN 61800-5-2.
SIL claim limit, for a subsystem as per EN 62061.
Safe Torque Off in accordance with EN 61800-5-2.
Duration of use in accordance with EN ISO 13849-1.
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