Fronius DeviceNet Instructions De Service page 44

General
Safety
Danger from incorrect operation and work that is not carried out properly.
This can result in serious personal injury and damage to property.
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Basics DeviceNet is an open, CAN-based system. CAN was developed several years ago
by the company R. Bosch for data transmission in motor vehicles. There are now
millions of CAN chips in use. A disadvantage of using CAN in automation applica-
tions is that it contains no definitions for the application layer. CAN only defines
the physical and data protection layer.
DeviceNet employs a standard application layer that makes the CAN protocol
useful for industrial applications. As an independent association, the ODVA
(Open DeviceNet Vendor Association) supports manufacturers and users of the
DeviceNet system. ODVA ensures that all devices that meet the specification
work together in one system, whether or not each device is manufactured by the
same company.
By means of the bit arbitration process, CAN basically offers the option of opera-
ting communications networks using master/slave and multimaster access proce-
dures. The bus coupler BK5200 (software version B2) supports master/slave ope-
ration (polling mode), where the bus coupler functions as slave. In future versi-
ons, the bus coupler will also support multimaster operation.
Machine concept
The DeviceNet is characterised by its small footprint and high degree of modula-
rity. The fact that it can simply be fitted to a standardised C-rail (thus saving
space) and employs direct cabling of actuators and sensors without any intercon-
nections between the terminals makes installation very straightforward. The uni-
form labelling concept further simplifies the installation.
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WARNING!
All the work and functions described in this document must only be carried
out by technically trained and qualified personnel.
Read and understand this document in full.
Read and understand all safety rules and user documentation for this device
and all system components.