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1.12.5 Reference Contour (Surface) Monitoring
The reference contour (surface) monitoring function prevents unintentional misalignment and deliberate manipulation of
the Scanner. If the Protective Field contains a reference contour (surface), the Scanner monitors both the Protective
Field (for intrusions) and the reference surface (for field position). If the distance between the sensor and the reference
surfaces changes from the original configuration (greater than the measurement tolerance factor Z
sm
), the Scanner will
detect the change and switch the OSSDs to OFF. The reference contour monitoring function can also prevent an
inappropriate Field Pair from becoming active.
The design of the installation and the risk assessment must identify the need and use of the reference contour (surface)
monitoring function. In horizontal applications, this function ensures that the safeguarded area does not change due to
the Scanner moving or changing position because an of impact, vibration, or poor maintenance practices (e.g.,
rotational movement). In a vertical application, the position of the Protective Field has a critical impact on the separation
(safety) distance. If there is an angular movement of the Scanner that causes the Protective Field to be positioned closer
to the hazard, an individual could access the hazard before the machine can stop (i.e., the safety distance is too short).
With a vertical Protective Field (angle of approach greater than ±30º) it is required that at least two sides, areas, or
surfaces of the Protective Field must be defined as reference contour. These two surfaces should be at differing angles
to each other (e.g., two legs of a right-angle corner). A surface in the Warning Field cannot be assigned as a reference
contour.
When one of the following is selected in the configuration software, the software will automatically define the boundary
of the Protective Field as the reference contour (shown as blue segments). This can be manually adjusted in the
configuration software.
Passage Control – access guarding (Access/Perimeter Guarding)
Arm Protection – point of operation (Vertical Guarding – Arm Detection)
Hand Protection – point of operation (Vertical Guarding – Hand Detection)
For more information on how to create a Protective Field and use a reference surface, see the AG4soft Software
Manual.
1 Physical frame for reference surface
2 Reference surface, must form at least
two sides of the PF
3 Scanner
4 Distance "e" between the reference
contour frame and machine opening,
recommended: e > 150 mm
5 Machine opening contour
Figure 1-10. Vertical Protective Field and reference surface for hazard point guarding
WARNING . . . REFERENCE CONTOURS
The design of the installation and the risk assessment must identify the need and use of the reference contour (surface) monitoring
function. A change in the position or mounting of the Scanner can result in gaps/unmonitored areas or an incorrect (too small) safety distance
(minimum distance). It is recommended that Reference Contour Monitoring be used for all stationary applications that have surfaces that can be
monitored.
Failure to follow these recommendations can potentially create a dangerous situation that may lead to serious injury or death.
1.12.6 Alarm (Auxiliary) Outputs
Two auxiliary output functions provide current sourcing (PNP) solid-state output (100 mA max.) and are used for
non-safety control functions; a typical use is to signal the state of the OSSDs to a programmable logic controller (PLC).
The Alarm outputs can have a different response time from the Protective Field response time. The response time can
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