Specifications
Leuze electronic MLC 520 EX 53
14.2 Dimensions, weight, response time
Dimensions, weight and response time are dependent on
• the resolution
• the length
Figure 14.1: Dimensions of transmitter and receiver
Effective protective field height H
PFE
goes beyond the dimensions of the optics area to the outer borders of
the circles labeled with R.
Load inductivity 2 H
Permissible wire resistance for load <200
b)
Permissible wire cross section 0.25 mm
2
Permissible cable length between receiver
and load
100 m
Test pulse width 60 s340 s
Test pulse distance (5 ms) 60 ms
OSSD restart delay time after beam interruption 100 ms
a) In the event of a failure (if the 0V cable is interrupted), each output behaves as a 120 k resistance to U
v
. A down-
stream safety PLC must not detect this as a logical 1.
b) Note the additional restrictions due to cable length and load current.
Safety-related PNP transistor outputs (short-circuit
monitored, cross-circuit monitored)
Minimum Typical Maximum
The safety-related transistor outputs perform the spark extinction. With transistor outputs, it is
therefore neither necessary nor permitted to use the spark extinction circuits recommended by
contactor or valve manufacturers (RC elements, varistors or recovery diodes), since these con-
siderably extend the decay times of inductive switching elements.
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