15 Glossary
AGV Automated guided vehicle
Control input A control input receives signals, e.g. from the machine or from the
cont
rol. Use of control inputs is how the protective device receives
information about the conditions at the machine, e.g., if there is a
change of operating mode. If the protective device is configured
appropriately, it will activate a different monitoring case after
receiving a new control input.
The control input information must be transmitted reliably. Gener‐
ally, at least 2 separate channels are used to do this.
Depending on the device, a control input can be realized as a sta‐
tic control input or a dynamic control input.
Dangerous state A dangerous state is a status of the machine or facility, where peo‐
ple ma
y be injured. Protective devices prevent this risk if the
machine is operated within its intended use.
The figures in this document always show the dangerous state of
the machine as movement of a machine part. In practice, there
are different dangerous states, such as:
•
Machine movements
•
Electrical parts
•
Visible and invisible beam
•
A combination of multiple hazards
EDM External device monitoring
Electro-sensitive protective
de
vice
An electro-sensitive protective device is a device or system of
devices for safety-related detection of people or parts of the body.
It is used to protect people from machines and facilities that pose
a risk of injury. It triggers the machine or facility to adopt a safe
state before a person is exposed to a hazardous situation.
Examples include safety light curtains and safety laser scanners.
ESD Electrostatic discharge
ESPE Electro-sensitive protective device
External device monitoring The external device monitoring (EDM) monitors the status of down‐
s
tream contactors.
In order to use external device monitoring, positively guided con‐
tactors must be used to switch off the machine. If the auxiliary
contacts of the positively guided contactors are connected to the
external device monitoring, the external device monitoring checks
whether the contactors switch correctly when the OSSDs are
switched off.
Field set A field set consists of one or more fields. The fields in a field set
ar
e 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.
FPLC Fail-safe programmable logic controller
15 GLOSSARY
128
O P E R A T I N G I N S T R U C T I O N S | S300 Mini 8014170/ZA23/2019-11-14 | SICK
Subject to change without notice
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