Functions
Leuze electronic
MLD 300, MLD 500
18
4
Functions
Table 4.1:
Overview of the safety functions
Table 4.2:
Functions of the different versions
4.1
Start/restart interlock
(MLD 320, MLD 330, MLD 335, MLD 520, MLD 530, MLS 535)
The start/restart interlock prevents automatic release of the safety circuits and automatic start-up of the
system (e.g. if the protective field is again clear or if an interruption in the voltage supply is restored). The
operator must make certain that no people are present in the danger zone before the system is manually
re-enabled with the start/restart button see chapter 8.6.1 „Unlocking start/restart interlock“.
Function
Description
Stop function
safety-related; initiated by the protective device
RES (start/restart interlock)
prevents automatic restart; forces manual confirmation
EDM (contactor monitoring)
monitors the N/C contacts of downstream positive-guided
contactors and relays
Muting
targeted, proper bridging of the protective function
Periodic function test
safety-related; initiated and tested, e.g. by an external
safety monitoring device
Function
MLD 310,
MLD 510
MLD 312,
testable
MLD 320,
MLD 520
MLD 330,
MLD 530
MLD 335,
MLD 535
OSSDs
2
1
2
2
2
Automatic start/restart
RES
a)
EDM
a)
EDM, selectable
Signal output
LED display
7-segment display
2-sensor muting, parallel and sequential
b)
Timing controlled 4-sensor muting
Laser alignment aid
(optional for transmitter-receiver systems)
Configurable operating modes
External test
a) Selectable
b) with shortened filter times: 0.1 s instead of 3 s
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