schmersal bp408, Installation Manual

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66 Installation manual of system “bp408” - Electrical connection
7.6 Electrical installation
After mechanical assembly of all components, carry out the electrical installation
using the circuit diagrams provided. Ensure proper connection of all terminal points
and compliance with EMC wiring guidelines.
WARNING!
Cables and plugs may only be mounted or removed in a de-energised state.
7.7 Bus connections
The bp408 control system uses the CAN bus according
to the application profile CiA 417. This profile also
describes the physical parameters of the bus lines and
the topology. Special regulations generally apply for the
wiring of bus systems.
7.7.1 Electrical bus medium
The components according to CiA 417 require a two-wire line for communication.
From the point of view of the bus, the individual connected components are
referred to as nodes. The nodes are connected in parallel to the bus. While doing
so, it must be ensured that the topology of the bus line always forms a line.
The CAN high-speed standard (ISO11898-2) requires that the bus be terminated
at the beginning and at the end with a resistor (120 ohms). Termination can be
done in different ways. For
some nodes, an internal
resistor can be activated via a
DIL switch or jumper, and for
others, a resistor must be
connected
to the bus
terminals. For exact
termination, refer to the
manuals of all connected
nodes!
The maximum number of nodes on the bus is limited to 64 nodes by the driver
blocks used. If more nodes are required, repeaters or bridges must be used (see
further below).
Figure 43:
Lift components that
comply with the
application profile CiA 417
must bear this logo.
Figure 44:
The bus must be terminated at the beginning and end with a
120 ohms resistor.