Smart Process Gating
Leuze electronic GmbH + Co. KG
MLC 530 SPG
34
4.5.2
Gating timeout extension
In order to prevent easy manipulation, the bridging cycle is time-limited. If this time is exceeded (timeout),
gating ends and results in shutdown of the OSSDs (E79).
NOTICE
Interruption of the transmitter/receiver synchronization on timeout extension!
The OSSDs of the safety light curtain switch off if the synchronization of transmitter and receiver
is interrupted via the synchronization beams for longer than 60 s.
Ä
For application scenarios with timeout extension, make certain that the upper or lower syn-
chronization beam is not interrupted by the transport material. To do this, the length of the
protective field is to be appropriately dimensioned.
The standard gating timeout of 10 minutes can optionally be extended by another control signal (TH timer
hold signal) from the control to up to 100 hours. The timeout extension is available in all operating modes.
The timer hold signal (TH) must switch with the CS switching signal within 0.5 s:
• The CS switching signal switches from 0 V to +24 V.
• The TH timer hold signal switches from +24 V to 0 V.
• When the TH timer hold signal switches from 0 V to +24 V, the gating sequence is extended.
If the control is faulty, the receiver switches to the interlock state (E69).
CS
TH
t1
t2
t3
PFI
GA
max. 100 h
CS
Switching signal from the control
TH
Timer hold signal from the control
PFI
Protective field interrupted
GA
Gating active
t1
< 4 s
t2
0.5 s, 1 s or 2 s (depending on the operating mode)
t3
< 20 s
Fig. 4.9:
SPG timeout extension
