PROFINET
PROFINET (Process Field Protocol) is an Ethernet-based network
used in industrial automation.
With PROFIsafe , PROFINET is also suitable for safety-oriented
data communication.
Protective field
The protective field is the area in which the test object specified
by 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. The 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
state 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
known 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).
GLOSSARY
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Subject to change without notice