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.
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)
Slave
A slave device provides data in a network on request.
A device in the network to which a slave device provides data has
the role of master.
In some modern networks, many or all devices can switch
between roles or have both roles at one time.
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.
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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