Product Overview
FC5101 and FC5102
12
Version: 2.0
Device Profile
The BECKHOFF CANopen devices support all types of I/O communication, and correspond to the device
profile for digital and analog input/output modules (DS401 Version 1). For reasons of backwards
compatibility, the default mapping was not adapted to the DS401 V2 profile version.
Data transfer rates
Nine transmission rates from 10 kbaud up to 1 Mbaud are available for different bus lengths. The effective
utilization of the bus bandwidth allows CANopen to achieve short system reaction times at relatively low data
rates.
Topology
. The number of devices participating in each network is logically
limited by CANopen to 128, but physically the present generation of drivers allows up to 64 nodes in one
network segment. The maximum possible size of the network for any particular data rate is limited by the
signal propagation delay required on the bus medium. For 1 Mbaud, for instance, the network may extend
25 m, whereas at 50 kbaud the network may reach up to 1000 m. At low data rates the size of the network
can be increased by repeaters, which also allow the construction of tree structures.
Bus access procedures
CAN utilizes the Carrier Sense Multiple Access (CSMA) procedure, i.e. all participating devices have the
same right of access to the bus and may access it as soon as it is free (multi-master bus access). The
exchange of messages is thus not device-oriented but message-oriented. This means that every message is
unambiguously marked with a prioritized identifier. In order to avoid collisions on the bus when messages
are sent by different devices, a bit-wise bus arbitration is carried out at the start of the data transmission. The
bus arbitration assigns bus bandwidth to the messages in the sequence of their priority. At the end of the
arbitration phase only one bus device occupies the bus, collisions are avoided and the bandwidth is optimally
exploited.
Configuration and parameterization
The TwinCAT System Manager allows all the CANopen parameters to be set conveniently. An "eds" file (an
electronic data sheet) is available on the Beckhoff website (
) for the parameterization
of Beckhoff CANopen devices using configuration tools from other manufacturers.
Certification
The Beckhoff CANopen devices have a powerful implementation of the protocol, and are certified by the
CAN in Automation Association (
).
