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SICK MSL
8 007 653/09-04-01 Technical Description • MSL © SICK AG • Safety Systems • Germany • All rights reserved
1
2
3
4
5
6
7
8
+24 V
0 V
OSSD1
OSSD2
RES
EDM
OWS
Fig. 21: Wiring diagram of the receiver unit
or MSLZ
7.3 Receiver unit
The electrical connection diagram
of the receiver unit and the MSLZ is
shown in
fig. 21.
7.3.1 Switching outputs
Both outputs OSSD 1 and OSSD 2
are actively monitored, short-circuit
proof PNP semiconductor outputs.
The outputs can be loaded with a
maximum of 0.5 A and are not
floating, but are referenced to 0 V.
For unobstructed light beams, both
outputs are active HIGH. The
output voltage U
a
of both channels
is dependent on the supply voltage
U
v
and the switched load, and is at
least
U
a
³
U
V
– 3 V
7.3.2 Output: Contamination
warning (OWS)
The contamination warning output
(OWS = Output Weak Signal) is a
short-circuit proof PNP semi-
conductor output which is active
(HIGH) for an unobstructed but
weak light beam (
fig. 22). This
output is not floating but is
referenced to 0 V.
The OWS outputs of several MSLs
can be connected together to
one
signal receptor or a PLC input. Par-
allel switching of several MSL
contamination warning is possible
("wired OR").
The maximum output current is
100 mA.
Fig. 22: The contamination warning output
+24V
7
OWS
Voltage at output
(standard implementation)
Light barrier contaminated
+ 24 V
Light barrier not contaminated
0 V
Note
Connection of the receiver
outputs OSSD 1 and OSSD 2
(fig. 23)
‡
An additional supply voltage
must not be applied to the
outputs
‡
Both output signals must be
processed separately. They
must not be connected in
series or parallel