Monitoring case A monitoring case indicates the machine status to the sensor.
G
enerally, one field set is assigned to each monitoring case.
The sensor receives a defined signal for the current machine
status. When a signal change occurs, the sensor activates the
monitoring case and thereby the field set that is associated with
the new machine status.
OFF state The OFF state is the status of the outputs of the protective device,
wher
e 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).
ON state The ON state is the status of the outputs of the ESPE, where the
controlled machine is permitted to operate (e.g., the voltage at the
OSSDs is HIGH so that the machine can run).
OSSD Output signal switching device: signal output for the protective
device, which is used for stopping the dangerous movement.
An OSSD is a safety switching output. The functionality of each
OSSD is tested periodically. OSSDs are always connected in pairs
and must undergo dual-channel analysis for safety reasons. An
OSSD pair is formed from 2 OSSDs that are connected and ana‐
lyzed together.
PFHD Probability of dangerous failure per hour
PL Performance level (ISO 13849)
PROFINET PROFINET (Process Field Protocol) is an Ethernet-based network
used in indus
trial 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
v
ehicle. 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.
Reference contour field The contour as reference field monitors a contour of the environ‐
ment. T
he 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.
17 GLOSSARY
196
O P E R A T I N G I N S T R U C T I O N S | microScan3 – PROFINET 8021219/1ELL/2022-01-21 | SICK
Subject to change without notice
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