BECKHOFF BK3000 - Manual (Page 9)

Basic information
BK3xxx/LC3100 9
Power supply
BK3xx0:
24 V DC on the topmost
terminals The bus couplers need an operating power of 24 V DC which is connected
via the topmost spring terminals, labeled "24 V” and "0 V”. This power
supply serves not only the electronic components of the bus coupler but
(via the K bus) also the bus terminals. The power supply of the bus coupler
circuitry and that of the K-bus (Terminal bus) are electrically isolated from
the voltage of the field level.
LC3100:
24 V DC to the central pairs
of terminals The LC3100 bus coupler is supplied via the two central terminal pairs. The
power contacts pass the supply voltage on to the field level.
Power supply to the power contacts
Lower 3 terminal pairs for
power input
maximum 24 V
maximum 10 A The six lower connections with spring terminals can be used to supply
power to the peripherals. The spring terminals are connected in pairs to the
power contacts. The power supply to the power contacts has no
connection to the power supply of the bus couplers. The power input is
designed to permit voltages up to 24 V. The pair-wise arrangement and the
electrical connection between the feed terminal contacts makes it possible
to loop through the wires connecting to different terminal points. The load
on the power contact may not continuously exceed 10 A. The current
capacity between two spring terminals is the same as the capacity of the
connecting wires.
Power contacts
Spring contacts at the side On the right-hand side face of the bus coupler are three spring contacts
which are the power connections. The spring contacts are recessed in slots
to prevent them from being touched. When a bus terminal is connected,
the blade contacts on the left-hand side of the bus terminal are connected
to the spring contacts. The slot and key guides at the top and bottom of the
bus couplers and bus terminals ensure reliable location of the power
contacts.
Fieldbus connection
BK30X0, BK31X0
9 pin sub-D socket strip There is a recessed front face on the left hand side. The typical Profibus
connecting plug can be inserted here. A full description of the fieldbus
interfaces is found elsewhere in this manual. (In the section on The
Medium: Plugs and Cables)
BK3500 LWL (optical
fibres) The plugs for the optical fibres are 2 HP Simplex plugs that are inserted
into the sockets. The two required plugs are included.
LC3100: Bus connection
via spring loaded terminals In the LC3100 bus coupler the bus is connected directly at the upper
terminal pair.
Configuration interface
Serial interface under the
front flap On the lower part of the front face you will find the standard bus 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 means of the PLC interface communications.