34
LBK System Series| Instruction manual v1.2 SET 2021 |SAF-UM-LBKBus-en-v1.2|© 2020-2021 Inxpect SpA
4. Functioning principles
According to EN ISO 13849-1, the architectures of the control unit and LBK-S01 sensor are classified
respectively as category 3 equivalent and category 2. Since LBK System Series is composed of the control unit
and sensors together, it can be classified category 2 or category 3 equivalent based on the installation
configuration and layout.
LBK System Series compliance with PL d, category 2 architecture is always guaranteed, and does not require the
installer to perform any additional operation. There is no parameter combination that can lead to a configuration
which has a risk reduction lower than PL d, category 2.
On the contrary, compliance with PL d, category 3 equivalent architecture requires a specific configuration of the
system sensors.
4.3.2 PL d, category 2 configuration
Sensors connected to the same control unit operate independently. They can have different positions,
configurations and safety working modes (see "Safety working modes and safety functions" on the next page).
Some architecture examples are as follows:
4.3.3 PL d, category 3 configuration
Requirements
Sensors must be installed with a redundant configuration to cover the same dangerous area, thus creating a 1oo2
multi-channel architecture.
To reach a category 3 equivalent architecture, the following requirements must be met:
l At least two sensors must monitor the same dangerous area at the same time.
l Sensors that monitor the same area must have the same safety working mode. Assuming that an area is
monitored by two sensors, the valid safety working mode combinations are the following:
o
Sensor 1: access detection, Sensor 2: access detection
o
Sensor 1: both access detection and restart prevention, Sensor 2: both access detection and restart
prevention
o
Sensor 1:restart prevention, Sensor 2:restart prevention
l Sensors that monitor the same area must have the same restart timeout.
l The muting of sensors that monitor the same area must be enabled or disabled at the same time.
If multiple configurations were stored on the control unit, each individual configuration should comply with the
requirements listed above in order to classify the system as category 3 equivalent.
To Next Page
Loading...
Need help?
General
