Beckhoff BK3000 User Manual download pdf (Page 6)

Basic information

6 BK3xxx/LC3100

Basic information

The Beckhoff bus terminal system

Up to 64 bus terminals

each with 2 I/O channels

for any form of signal

Decentralized wiring of the

I/O level

IPC as control unit

Bus couplers for all current

bus systems

Standard C rail assembly

Modularity

Display of channel status

The bus terminal system is the universal connecting link between a

fieldbus system and the sensor/actor level. A unit consists of a bus coupler,

which is the interface to the fieldbus, and up to 64 electronic terminals, of

which the last is an end terminal. Terminals, each with two I/O channels,

are available for any form of technical signal and can be combined as

desired. The various types of terminal are all constructed in the same way,

so that the planning costs are kept extremely low. The height and depth of

the construction are calculated for compact terminal cabinets.

Fieldbus technology makes it possible to use compact control

architectures. The I/O level does not need to be taken right up to the

control unit. Sensors and actors can be connected decentrally with minimal

lengths of cable. You can position the control unit at any convenient

location in the installation. Using an industrial PC as control unit makes it

possible to implement the operating and monitoring element as part of the

control hardware, so the control unit can be located on an operating desk,

control point or similar. The bus terminals constitute the decentralized

input/output level of the control unit in the switch cabinet and its

subordinate terminal cabinets. As well as the sensor/actor level, the power

unit of the equipment is also controlled via the bus system. The bus

terminal replaces a conventional terminal as the cabling level in the switch

cabinet; the switch cabinet can be made smaller.

The Beckhoff bus terminal system combines the advantages of a bus

system with the functionality of compact terminals. Bus terminals can be

used on all current bus systems and serve to reduce the diversity of parts

in the control unit, while behaving like the conventional standard units for

the relevant bus system and supporting the entire range of functionality of

the bus system.

The simple and compact assembly on a standard C rail, and the direct

cabling of actors and sensors without cross connections between the

terminals, serve to standardize the installation, as does the uniformly

designed labeling.

The small size and great flexibility of the bus terminal system mean that

you can use it anywhere that you could use a terminal and use any type of

connection – analog, digital, serial or direct sensors.

The modular construction of the terminal row, using bus terminals with

various functions, limits the number of unused channels to at most one per

function. Two channels to a terminal is the optimum solution for the number

of unused channels and the cost per channel. The possibility of using

power input terminals to provide separate power supplies also helps to

minimize the number of unused channels.

The integrated light-emitting diodes close to the sensor/actor indicate the

status of each channel.

The K-bus

End terminal

The K-bus is the path taken by data within the terminal row. The bus

coupler carries the K bus through all the terminals by means of six contacts

on the side walls of the terminals, and the end terminal terminates the K

bus. The user does not need to know anything about the function of the K

bus or the internal operation of terminals and bus couplers. There are

numerous software tools available which provide for convenient planning,

configuration and operation.

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Beckhoff BK3000 User Manual Page 6

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