Response time The protective device’s response time is the maximum time
be
tween 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.
ROI Region of interest: Selected range of measured values that can be
used, for example, for further analysis.
ROI set An ROI set consists of one or more ROIs.
Safety function Function of a machine whose failure can result in an immediate
incr
ease 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.
SIL Safety integrity level
Static control input A static control input is a dual-channel control input, which evalu‐
a
tes 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.
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‐
t
ing, 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 16
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103
Subject to change without notice
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