Beckhoff BC3150 Manuel d'utilisateur télécharger pdf (Page 12)

Safety Instructions

10 Fieldbus Components

Potential feed terminals for isolated groups

The operating voltage is passed on to following terminals via three power contacts. You can divide the terminal strip

into arbitrary isolated groups by means of potential feed terminals. The potential feed terminals play no part in the

control of the terminals, and can be inserted at any locations within the terminal strip.

Up to 64 terminals can be used within one terminal strip. This count does include potential feed terminals, but not the

end terminal.

Bus Couplers for various fieldbus systems

Various Bus Couplers can be used to couple the electronic terminal strip quickly and easily to different fieldbus

systems. It is also possible to convert to another fieldbus system at a later time. The bus coupler performs all the

monitoring and control tasks that are necessary for operation of the connected Bus Terminals. The operation and

configuration of the Bus Terminals is carried out exclusively by the Bus Coupler. Nevertheless, the parameters that

have been set are stored in each Bus Terminal, and are retained in the event of voltage drop-out. Fieldbus, K-Bus

and I/O level are electrically isolated.

If the exchange of data over the fieldbus is prone to errors or fails for a period of time, register contents (such as

counter states) are retained, digital outputs are cleared, and analog outputs take a value that can be configured for

each output when commissioning. The default setting for analog outputs is 0 V or 0 mA. Digital outputs return in the

inactive state. The timeout periods for the Bus Couplers correspond to the usual settings for the fieldbus system.

When converting to a different bus system it is necessary to bear in mind the need to change the timeout periods if

the bus cycle time is longer.

The interfaces

A Bus Coupler has six different methods of connection. These interfaces are designed as plug connectors and as

spring-loaded terminals.

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Beckhoff BC3150 Manuel d'utilisateur Page 12