Protective field The protective field is the area in which the test object specified
b
y the manufacturer is detected by the electro-sensitive protec‐
tive equipment (ESPE). As soon as the electro-sensitive protective
device detects an object in the protective field, it switches the
associated safety outputs to the OFF state. This signal can be
passed to controllers resulting in the dangerous state coming to
an end, e.g. to stop the machine or the vehicle.
Reference contour field The contour as reference field monitors a contour of the environ‐
ment. T
he safety laser scanner switches all safety outputs to
the OFF state if a contour does not match the set parameters,
because, for example, the mounting of the safety laser scanner
has been changed.
National and international standards require or recommend that a
reference contour is monitored, if the safety laser scanner is used
in vertical operation for hazardous point protection or for access
protection.
Reset When a protective device has sent a stop command, the stopped
s
tate must be maintained until a reset device is activated and the
machine can be restarted in a second step.
The reset brings the protective device back to the monitoring state
after it has sent a stop command. The reset also quits the start-up
or restart interlock of a protective device, so that the machine can
be restarted in a second step.
The reset must only be possible, when all safety functions and
protective devices are functional.
The reset of the protective device must not introduce any move‐
ment or dangerous situations itself. The machine is only permitted
to start after the reset once a separate start command has been
sent.
•
Manual resets are performed using a separate, manually oper‐
ated device, such as a reset pushbutton.
•
Automatic resets by the protective device are only permitted in
special cases, if one of the following conditions is met:
°
It must not be possible for people to be in the hazardous
area without triggering the protective device.
°
It must be ensured that no people are in the hazardous
area during or after the reset.
Resolution The resolution of an active opto-electronic protective device (also
k
nown as the sensor detection capability) is the minimum size of
an object for it to be reliably detected.
Response time The protective device’s response time is the maximum time
between the occurrence of the event leading to the sensor’s
response and supply of the switch-off signal to the protective devi‐
ce’s interface (for example OFF state of the OSSD pair).
Restart interlock The restart interlock prevents the machine from automatically
s
tarting up, for example after a protective device has responded
while the machine is operating or after changing the machine’s
operating mode.
The restart interlock can be implemented in the protective device
or in the safety controller.
A command to reset the protective device must be given, for
example using a reset pushbutton, before the machine can be
restarted.
Retroreflector A retroreflector reflects light back toward the light source largely
independentl
y of the alignment of the retroreflector.
GLOSSARY 17
8020200/1NTM/2024-06-03 | SICK O P E R A T I N G I N S T R U C T I O N S | microScan3 – EtherNet/IP™
211
Subject to change without notice
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