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BK5200 BK52x0 DeviceNet 14
BK5200
BK52x0 DeviceNet
Introducing the system
DeviceNet
Bus power and terminal
power are supplied sepa-
rately. Both power supplies
must be connected
DeviceNet is an open system based on the CAN principle which was de-
veloped a few years ago by the company R. Bosch. CAN was primarily
intended for the transfer of data within automobiles, and millions of CAN
chips have since been installed. The disadvantage of using CAN in auto-
mation technology is that it does not define an application layer, it specifies
only the physical layer and data security layer.
DeviceNet specifies a uniform application layer which makes it possible to
use the CAN protocol for industrial applications. The ODVA (Open Device-
Net Association) is an independent association which supports manufac-
turers and users of the DeviceNet system. The ODVA ensures that all de-
vices which conform to the specification can operate together in one sy-
stem regardless of their manufacture.
SMC
Allen-Bradley
Drive
Sensor
Bar Code Scanner
Device Configuration
Other
Devices
Motor
Controller
Controller
DeviceNet
Pushbutton
Cluster
Motor
Starter
Input/Output
Devices
Sample for a DeviceNet network
CAN’s bit arbitration procedure makes it theoretically possible to operate
communication networks using master/slave and multimaster access me-
thods. The bus coupler BK5200 with the corresponding software release
B2 supports master/slave operation (in polling mode) with the bus coupler
functioning as slave. Subsequent releases of the bus coupler will also sup-
port multimaster operation.
The bus coupler does not receive its operating power via the DeviceNet
bus cable. The bus coupler and the peripherals (the bus terminals) must be
wired up using the connections on the top right-hand side (this is explained
in the introductory pages) which enables you to isolate the bus electrically
from the peripherals. If you wish, you can connect the power supply of the
bus cable to the peripherals side and dispense with the decentralized po-
wer supply.
Bus cable
The bus cable consists of two pairs of shielded twisted-pair wiring, one for
the data transfer and one for the power supply. The latter can carry cur-
rents of up to 8 amperes. The maximum possible length of a line depends
essentially on the Baud rate. If you choose the highest Baud rate
(500kBaud) you are restricted to lines of at most 100 m. With the lowest
Baud rate (125kBaud) you will be able to use cable with an overall length
500m.
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