BECKHOFF BK7500 - Manual (Page 6)

Basic information
6 BK7500
Power input terminals
for
separately powered groups Three power contacts pass the operating power to the following terminals.
You can use power input terminals to subdivide the terminal row as desired
into groups, each with a separate power supply. These power input
terminals are not taken into account for addressing the terminals, you can
insert them at any position along the terminal row.
You can install up to 64 terminals on a terminal row, including power input
terminals and the end terminal.
The principle of the bus
terminal
Potential
isolation
Potential
supply
bus terminal Power supply
for the
Bus coupler
02 01
+ +
PE PE
24V 0V
K-Bus
End terminal
Power
contacts
SERCOS interface
Bus coupler
BK7500
Bus couplers for various
fieldbus systems
You can use a variety of bus couplers to attach the electronic terminal row
quickly and easily to the various fieldbus systems, and you can also
subsequently convert to a different fieldbus system. The bus coupler deals
with all the necessary monitoring and control tasks for operating the
attached bus terminals, indeed all the operation and configuration of the
bus terminals is carried out via the bus coupler. The fieldbus, K bus and I/O
level are electrically isolated.
If the exchange of data across the fieldbus is temporarily interrupted, logic
states are preserved, digital outputs are cleared and analog outputs revert
to a reset value which can be individually configured for each output when
the equipment is set up.
The default for the analog outputs is 0V or 0mA. Digital outputs assume an
inactive state. The bus couplers' timeouts correspond to the usual times for
the field bus system. When changing over to a different bus system, pay
attention to the change in timeouts in the event of larger-scale bus system
cycle times.