BECKHOFF BK7300 - Manual (Page 10)

Basic information
6 BK7300
Configuration Interface
Serial interface under the
front cover The standard bus couplers have an RS232 interface at the bottom of the
front face. The miniature connector can be joined to a PC with the aid of a
connecting cable and the KS2000 configuration software. The interface
allows the analogue channels to be configured. The functionality of the
configuration interface can also be reached via the fieldbus using the PLC
interface.
KS2000 Software
In order to link the MODBUS BK7300 coupler and the KS2000
configuration software, the coupler's address selection switch must be set
to "00", and it must be restarted (i.e. the coupler must be switched off and
then on again).
K-bus contacts
6 contacts at the side
The connections between the bus coupler and the bus terminals are
effected by gold contacts at the right-hand side of the bus coupler. When
the bus terminals are plugged together, these gold contacts automatically
complete the connection to the bus terminals. The K bus is responsible for
the power supply to the electronic components of the K bus in the bus
terminals, and for the exchange of data between the bus coupler and the
bus terminals. Part of the data exchange takes place via a ring structure
within the K bus. Disengaging the K bus, for example by pulling on one the
bus terminals, will break this circuit so that data can no longer be
exchanged. However, there are mechanisms in place which enable the bus
coupler to locate the interruption and report it.
Supply isolation
3 supply groups:
fieldbus
K-bus
peripheral level The bus couplers operate with three independent supplies. The input
power supplies the electrically isolated K-bus circuitry in the bus coupler
and the K-bus itself. The power supply is also used to generate the
operating power for the fieldbus.
Note: All the bus terminals are electrically isolated from the K bus, so that
the K-bus is completely electrically isolated.
Setting up the power levels
in the bus terminal system
Periphery level
Bus terminals Bus coupler
Field bus
24 V DC
Terminal bus