SICK microScan3 EtherNet/IP Operating Instructions Manual page 195

8020200/15ZT/2019-11-14 | SICK
Subject to change without notice
Field set
Master
Monitoring case
OFF state
ON state
OSSD
PFHD
PL
Protective field
A field set consists of one or more fields. The fields in a field set
are monitored simultaneously.
A field set can contain various types of field.
A typical application is the use of a protective field with one or
more warning fields: if a vehicle approaches a person, a warning
field triggers an optical or acoustic signal. If the person does not
react to this and the vehicle continues to approach, the safety
laser scanner detects an object in the protective field and
switches the associated safety outputs to the OFF state. The vehi‐
cle stops before it reaches the person.
The master device actively builds data connections in a network.
A device in a network which is addressed by a master device has
the role of slave.
In modern networks, many or all devices can switch between roles
or have both roles at one time.
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.
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).
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).
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.
Probability of dangerous failure per hour
Performance level (ISO 13849)
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.
O P E R A T I N G I N S T R U C T I O N S | microScan3 – EtherNet/IP™
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GLOSSARY
195