BECKHOFF BK5200 - Manual (Page 20)

BK5200, BK5210, LC5200 DeviceNet
20 BK52x0
BK5200, BK5210, LC5200 DeviceNet
Introduction to the system
DeviceNet
BK5200, BK5210:
Bus power and terminal
power are supplied
separately.
Both power supplies must
be connected. DeviceNet is an open system based on CAN, developed by Bosch a few
years ago. 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 automation 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 and this makes it possible
to use the CAN protocol for industrial applications. ODVA (the Open
DeviceNet Vendor Association) is an independent association which
supports manufacturers and users of the DeviceNet system. ODVA
ensures that all devices which conform to the specification can operate
together in one system, regardless of their manufacturer.
SMC
Allen-Bradley
Drive
Sensor
Bar Code Scanner
Device Configuration
Other
Devices
Motor
Controller
Controller
DeviceNet
Pushbutton
Cluster
Motor
Starter
Input/Output
Devices
Examples of DeviceNet in use
CAN’s bit arbitration procedure makes it theoretically possible to operate
communication networks using master/slave and multimaster access
methods. The BK5200 Bus Coupler 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
software will also support multimaster operation.
The BK5200 and BK5210 Bus Couplers are not supplied with 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). This 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 peripheral side and
dispense with the decentralised power supply.
The LC5200 Bus Coupler is supplied with power via the DeviceNet bus
cable. This means that there is no electrical isolation between the bus and
the peripherals. If the peripheral level nevertheless needs to have an
electrically isolated implementation, this can easily be achieved through the
use of isolating terminals (KL9xxx).