Beckhoff BC3150 Manuel d'utilisateur télécharger pdf (Page 11)

Safety Instructions

Fieldbus Components 9

The Beckhoff Bus Terminal System

Up to 64 Bus Terminals each having 2 I/O channels for each signal form

The Bus Terminal system is the universal interface between a fieldbus system and the sensor / actuator level. A unit

consists of a Bus Coupler as the head station, and up to 64 electronic series terminals, the last one being an end

terminal. For each technical signal form, terminals are available each having two I/O channels, and these can be

mixed in any order. All the terminal types have the same mechanical construction, so that difficulties of planning and

design are minimized. The height and depth match the dimensions of compact terminal boxes.

Decentralized wiring of each I/O level

Fieldbus technology allows more compact forms of controller to be used. The I/O level does not have to be brought to

the controller. The sensors and actuators can be wired decentrally, using minimum cable lengths. The controller can

be installed at any location within the plant.

Industrial PCs as controllers

The use of an Industrial PC as the controller means that the operating and observing element can be implemented in

the controller’s hardware. The controller can therefore be located at an operating panel, in a control room, or at some

similar place. The Bus Terminals form the decentralized input/output level of the controller in the control cabinet and

the subsidiary terminal boxes. The power sector of the plant is also controlled over the bus system in addition to the

sensor/actuator level. The Bus Terminal replaces the conventional series terminal as the wiring level in the control

cabinet. The control cabinet can have smaller dimensions.

Bus Couplers for all usual bus systems

The Beckhoff Bus Terminal system unites the advantages of a bus system with the possibilities of the compact series

terminal. Bus Terminals can be driven within all the usual bus systems, thus reducing the controller parts count. The

Bus Terminals then behave like conventional connections for that bus system. All the performance features of the

particular bus system are supported.

Assembly on standardized C mounting rails

The easy, space-saving, assembly on a standardized C-rail, and the direct wiring of actuators and sensors, without

cross-connections between the terminals, standardizes the installation. The consistent labelling scheme also

contributes.

The small physical size and the great flexibility of the Bus Terminal system allows it to be used wherever a series

terminal is also used. Every type of connection, such as analog, digital, serial or the direct connection of sensors can

be implemented.

Modularity

The modular assembly of the terminal strip with Bus Terminals of various functions limits the number of unused

channels to a maximum of one per function. The presence of two channels in one terminal is the optimum

compromise of unused channels and the cost of each channel. The possibility of electrical isolation through potential

feed terminals also helps to keep the number of unused channels low.

Display of the channel state

The integrated LEDs show the state of the channel at a location close to the sensors and actuators.

K-Bus

The K-Bus is the data path within a terminal strip. The K-Bus is led through from the Bus Coupler through all the

terminals via six contacts on the terminals’ side walls. The end terminal terminates the K-Bus. The user does not

have to learn anything about the function of the K-Bus or about the internal workings of the terminals and the Bus

Coupler. Many software tools that can be supplied make project planning, configuration and operation easy.

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Beckhoff BC3150 Manuel d'utilisateur Page 11

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