C Glossary - Festo CAMC-G-S3 Manual

C Glossary
C Glossary
C.1 Safety terms and abbreviations
Term/abbreviation
ALF
Cat.
CCF
DC avg
Emergency off
Emergency stop
FCT
HFT
MTTFd
OSSD
PFH
PL
Safety switching
device
SBC
SFF
SIL
SILCL
SLS
SOS
SS1
SS2
Festo – GDCP-CAMC-G-S3-EN – 1406NH – English
Description
"Additional Logic Function" Not a safety function. Allows the logical intercon­
nection of internal inputs and outputs.
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 is ensured in case of emer­
gency by switching off the electrical energy to all or part of the installation.
Emergency off is to be used where a risk of electric shock or other electrical
risk exists.
In accordance with EN 60204-1: Functional safety is ensured in an emergency
by bringing a machine or moving parts to idle.
Emergency stop is used to stop a movement which could lead to a hazard.
Festo Configuration Tool, software for configuration and commissioning.
Hardware Fault Tolerance in accordance with IEC 61508.
Mean Time To Failure (dangerous): Time in years until the first dangerous
failure will have occurred with 100 % probability, in accordance with
EN ISO 13849-1.
"Output Signal Switching Device": Output signals with 24 V level cycle rates
for error detection.
Probability of Dangerous Failures per Hour in accordance with IEC 61508.
Performance Level in accordance with EN ISO 13849-1: Stages a ... e.
Device for execution of safety functions or achievement of a safe status of
the machine by switching off the energy supply to dangerous machine func­
tions. The desired safety function is achieved only in combination with other
measures for risk reduction.
Safe Brake Control in accordance with EN 61800-5-2.
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, EN 62061
and EN ISO 13849.
Maximum SIL that can be required from a sub-system.
Safely-Limited Speed in accordance with EN 61800-5-2.
Safe Operating Stop in accordance with EN 61800-5-2.
Safe Stop 1 in accordance with EN 61800-5-2.
Safe Stop 2 in accordance with EN 61800-5-2.
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