Siemens ISI EN 50295 Brochure page 26

AS-Interface
AS-Interface Safety at work
AS-Interface laser scanner LS4
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Function
Function principle
Bundled light pulses are created via a laser diode with coupled
transmission optics. These are diverted by a rotating mirror in
such a way that within 40 ms a light pulse is triggered in all angle
segments (scan rate: 25 scans/s). If the light pulse hits an object
or a person, the light is reflected and acquired and evaluated by
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the scanner.
Measuring pulse propagation time
The SIGUARD LS4 laser scanner operates by measuring the
pulse propagation time. When extremely short light pulses are
emitted, a time difference occurs between the transmitted and
received light pulse. The propagation time of the light pulse is a
direct measurement of the target distance.
The operating range of the scanner (190°) is subdivided into
angle segments of 0.36°.
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Protection and warning field pairs
The device has 4 switchable protection and warning field pairs.
LS4Soft operating software
The SIGUARD LS4 laser scanner must be parameterised using
the associated LS4Soft software. The personal protection and
warning fields required are set in this manner. Also configuration
parameters, such as automatic/manual start, response time and
restart time can be parameterised.
Additional information is available in the Internet under:
http://www.siemens.de/laserscanner