Monitoring case
A monitoring case signals the machine status to the safety laser
scanner. The safety laser scanner activates the field set, which is
assigned to the monitoring case and therefore a particular
machine status.
If a machine, e.g., has various operational statuses, a monitoring
case can be assigned to each operational status. The safety laser
scanner receives a defined signal for the current operational sta‐
tus via the control inputs or the network. If there is a change of sig‐
nal, the safety laser scanner switches from one monitoring case to
the monitoring case that is assigned to the new signal (as well as
the new operational status). Generally, one field set is assigned to
each monitoring case.
OFF state
The OFF state is the status of the outputs of the protective device,
where the controlled machine is triggered to quit its dangerous
state and the start-up of the machine is prevented (e.g., the volt‐
age at the OSSDs is LOW, so that the machine is switched off and
remains still).
PFHD
Probability of dangerous failure per hour
PL
Performance level (ISO 13849)
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 protects the hazardous area of a machine or
vehicle. 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.
A horizontal or vertical protective field is required, depending on
the application. The electro-sensitive protective device can there‐
fore be mounted in horizontal or vertical alignment, depending on
the requirements.
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 pro‐
tective 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.
GLOSSARY
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Subject to change without notice
