Chapter 4
57
Connecting devices
4.3.3
Customized testable single beam photoelectric safety switches
For information on how to create customized elements please see the Safety
Controller Setting and Monitoring Tool Operating Manual.
In the Settings dialog for the customized element, select the minimum value for the
desired test gap.
Regardless of the test gap, the overall off-on-delay of the cascade must be smaller
than the Max. off-on delay of the respective test output (as shown in the Setting and
Monitoring Tool report) –2 ms. Otherwise the test gap will lead to switching off. For
WS0-XTIO or WS0-XTDI module this value is = 12 ms – 2 ms = 10 ms.
Use protected or separate cabling for the test output of the module (X1...X8) to the
test input of the transmitter and for the output of the receiver to the safe input of the
module (I1...I8). Otherwise a cross circuit between these signals can inhibit the
error detection by this test.
4.3.4
Information for mounting testable single-beam photoelectric safety
switches
Observe the information for mounting in the manual of the respective sensors and in
particular the following points:
Single-beam photoelectric safety switches may only be used as access protection
in accordance with EN/ISO 13855. Usage as finger and hand protection is not
permissible.
Observe the minimum distance to reflective surfaces.
It is imperative that the safety distance between the light beam and hazardous point
be observed at access protection.
S = Sender
R = Receiver
D = Distance between sender and
receiver
a = Minimum distance from reflective
surfaces
1) = Limit to hazardous area
2) = Reflective surface
3) = Direction of access to hazardous
area
4) = Optical axis
Note
Note
Figure 16:
Minimum distance “a” to
reflective surfaces, correct
mounting and alignment
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