Interface A2, Release Date: 02.03.2022
Page 16
LVMC User Manul A2 - 499.027.82
OPTRONIC AG
SWITZERLAND
Unteregger Strasse 53
CH-9403 Goldach
Phone: +41 (0)71 844 02 00
Fax:
+41 (0)71 844 02 10
e-mail: [email protected]
web: www.optronic.ch
A
B
C
4
Operation of the LVMC
4.1
Sensing Area
The light curtain LVMC consists of a middle carrier A, as well as a transmitter
fork B and a receiver fork C. The transmitter fork emits radiation, which is re-
ceived by the receiver fork. Transmitter and receiver fork form a homogeneous
sensing area. When an object enters the sensing area, it reduces the amount of
radiation received by the receiver fork. This shadowing corresponds to the ex-
tent projected onto the receiver fork of the section of the object that is currently
in the sensing area. The light curtain determines a new projected extent every 30us and combines these
30us wide stripes into a projected image of the object (the extent is plotted horizontally and the time vertical-
ly) and into a projected area of the object (in seconds by meters; s*m). The LVMC can thus create a two-
dimensional image of the object. The maximum extent, hereinafter referred to as the object size, and the
calculated area can be used as criteria for classification.
4.2
Operating Modes
The LVMC knows the two operating modes “stopped” and “running”. In “running” mode, it detects passing
objects and processes the recorded data according to the settings made in advance. In this mode, no chang-
es can be made to the configuration and no operating functions can be triggered. In “stopped” mode, the
situation is reversed: The light curtain does not detect any objects, but adjustments can be made to the con-
figuration and functions can be executed. If no error occurs, the LVMC automatically switches to the “run-
ning” mode after a restart. If the LVMC is in “running” mode and an error occurs, it automatically switches to
the “stopped” mode. Depending on the type of fault, the light curtain will:
stay in “stopped” mode.
after eliminating the cause of the error, automatically switch back to the “running” mode.
after a short pause of a few seconds repeatedly try to switch back to the “running” mode.
When switching to the “running” mode, the LVMC checks that data is consistent, performs function checks
and calibrates the sensing area. This process takes approximately one second. During this time, the light
curtain must be uncovered.
4.3
Access Levels
Two access levels are implemented in the LVMC, the user access level and the administrator access level.
You have full access to all functions and inputs only at the administrative access level. Switching to the ad-
ministrator access level can be password protected. No password is assigned at delivery. The change be-
tween the levels is initiated via the CMT software package, but for security reasons it is carried out entirely in
the LVMC, which operates independently at all times.