Abbreviations; System Overview - Siemens SIGUARD LS4-4 Anleitung

Safety-related input slave
A slave which reads the safety-related On or Off status of the sensor or activating unit
connected to it onto the system, and notifies the master or safety monitor of this.
Safety-related AS-Interface slave
A slave that serves to connect safety-related sensors, actuators and other devices.
Safety monitor
A component that monitors the safety-related slaves and the correct functioning of the
network
Slave
A component for the transmission of data, which is addressed cyclically by the master
by way of its address, and only then generates an answer.
Standard slave
Slave that serves for the connection of non-safety-related sensors, actuators and other
devices.
1.3

Abbreviations

AS-Interface
AOPD
EMC
FE
PELV
PLC
2

System overview

The LS4 area scanner is an active optoelectronic protective device (AOPD) of type 3. It
polls the protective field that has been selected by the setting of parameters on a
continuous basis, and when the protective field is violated switches off its OSSD safety
switching outputs (OSSD = output signal switching device), so checking the hazardous
movement. While the system is in operation, it is possible to switch between up to four
parameterised protective fields and warning fields by means of local sensor signals.
Depending on the parameter settings, the scanner may emit a non-safety-related
warning signal if the front pane becomes too dirty and/or in the case of a warning field
(that has likewise been parameterised) being violated.
Actuator sensor interface
Active optoelectronic protective device
Electromagnetic compatibility
Functional earth
Protective extra-low voltage
Programmable logic controls
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