Leuze electronic
MC3x
6
Table 1.4:
Terms and abbreviations
The checklists (see chapter 8 Testing ) serve as a reference for the machine manufacturer or supplier.
They replace neither testing of the complete machine or system prior to the initial start-up nor their periodic
testing by a competent person. The checklists contain minimum testing requirements. Depending on the
application, other tests may be necessary.
EDM
External Device Monitoring
OSSD
Output Signal Switching Device
RES
Start/
tart interlock
PDF-M
Magnetically Coded Sensors (Proximity Devices with defined behavior under
Fault conditions) with automatic monitoring (Self-Monitoring)
PDF-S
Magnetically Coded Sensors (Proximity Devices with defined behavior under
Fault conditions) with Single fault tolerance
PFH
d
Probability of a dangerous Failure per Hour
Probability of dangerous Failure per Hour
MTTF
Mean time to a dangerous failure
Mean Time To Failure
PL
Performance Level
2NO
Two contacts in "open" state without the presence of an actuator
xxx
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