BECKHOFF BK4000 - Manual (Page 8)

Basic information
8 BK4000
Configuration interface
Serial interface under the
front flap On the lower part of the front face you will find the standbus couplers which
are fitted with an RS232 interface. The miniature plug can be attached to a
PC by means of a connection cable and the configuration software KS2000.
This interface enables you to configure the analog channels. You can also
access the functionality of the configuration interface via the fieldbus by me-
ans of the PLC-Interface. The PLC interface consists of two additional bytes
that are also inserted in the process data.
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 interrup-
tion 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