BECKHOFF BC8000 - Manual (Page 20)

RS485 – Controller BC8000
20 BC8000
The emulation of the serial interface of the BC8000 behaves like a KL6001
and is therefore programmed in exactly the same way. Further information
can be found in the configuration instructions of the KL6001. Once
programming is successfully completed, the terminal can be removed. It
must be noted that the address of the terminal in the emulation must be
changed (emulation address: %IB500..505 and %QB500..505). The
emulation becomes active as soon as the address selector switch is set to
„99“ and the bus terminal controller is restarted.
Input Output
KL6001 emulation
%IB500 Status byte
%IB501 Data in 0
%IB502 Data in 1
%IB503 Data in 2
%IB504 Data in 3
%IB505 Data in 4
%QB500 Control byte
%QB501 Data out 0
%QB502 Data out 1
%QB503 Data out 2
%QB504 Data out 3
%QB505 Data out 4
The table shows the mapping of the interface emulation of the bus terminal
controller. The KL6001-0020 is exactly the same, but at another address.
The terminal address depends on the socket position and on the other
connected terminals. The example in the appendix should clarify this.
RS485
BC
80
00
RS485 connection
External RS485 device
BC8000
PC
or programming cable to the configuration port of the BC8000
RS485 connection
KL6021-0020
RS485
RS232
Control byte in process
data exchange The control byte is transmitted from the terminal to the controller. For
setting up data exchange (handshake), the control and the status byte are
used in process data exchange.