About this document
Leuze electronic GmbH + Co. KG
MLC 530 SPG
7
MTTF
d
Mean time to dangerous failure
(
M
ean
T
ime
T
o dangerous
F
ailure)
OSSD
Safety-related switching output
(
O
utput
S
ignal
S
witching
D
evice)
PFH
d
Probability of a dangerous failure per hour
(
P
robability of dangerous
F
ailure per
H
our)
PFI
(
P
rotection
F
ield
I
nterrupted)
PL
P
erformance
L
evel
P-mode
Protective mode
Reduced resolution
Reduction of the detection capability of the protective field without monitoring
for tolerating small objects in the protective field
RES
Start/restart interlock
(Start/
RES
tart interlock)
Scan
Consecutive scans of the protective field from the first to the last beam
Safety sensor
System consisting of transmitter and receiver
SIL
S
afety
I
ntegrity
L
evel
SPG
S
mart
P
rocess
G
ating
TH
Timer halt signal
State
ON: device intact, OSSD switched on
OFF: device intact, OSSD switched off
Locking: device, connection or control / operation faulty, OSSD switched off
(lock-out)
1.2
Checklists
The checklists (see chapter 10 "Testing") serve as a reference for the machine manufacturer or supplier.
They replace neither testing of the complete machine or system prior to initial commissioning nor their peri-
odic testing by a qualified person (see chapter 2.2 "Necessary competencies"). The checklists contain mini-
mum testing requirements. Depending on the application, other tests may be necessary.
