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
starting 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
independently of the alignment of the retroreflector.
Safety function
Function of a machine whose failure can result in an immediate
increase of the risk(s). (ISO 12100)
Safety output
A safety output provides safety-related information.
Safety outputs are OSSDs, for example, or safety-related informa‐
tion on a safety-related network.
Scan cycle time
The scan cycle time is the time the sensor needs for a complete
scan of its detection area.
Example: Time required by the mirror of a safety laser scanner for
one rotation.
SIL
Safety integrity level
SILCL
SIL claim limit (IEC 62061)
Static control input
A static control input is a dual-channel control input, which evalu‐
ates the status of every channel as the value 0 or 1. The signal
states of one or more static control inputs give a unique signal
pattern. This signal pattern activates a monitoring case.
Test rod
The test rod is an opaque, cylinder-shaped object used to check
the detection capability of the active opto-electronic protective
device. The diameter of the test rod is the same as the resolution
of the active opto-electronic protective device.
Universal I/O
Universal I/O can be configured as universal input or as universal
output.
Universal input
Depending on the device, a universal input can be used for reset‐
ting, external device monitoring (EDM), sleep mode, or restarting
the protective device, for example. If sleep mode is activated by
a universal input, the sleep mode must not be used for safety
applications. Certain universal inputs can also be used in pairs as
a static control input.
Universal output
The function of a universal output is configurable. Which functions
are available depends on the device. Possible signals are, for
example: reset required, contamination warning.
Warning field
The warning field monitors larger areas than the protective field.
Simple switching functions can be triggered with the warning field,
e.g. a warning light or an acoustic signal can be triggered if a
person approaches, even before the person enters the protective
field.
The warning field must not be used for safety applications.
GLOSSARY
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Subject to change without notice