BECKHOFF BC8000 - Manual (Page 31)

Appendix
BC8000 31
BC8000 as a Slave
General Information
When the BC8000 is used as a slave, all the terminals are assigned to the
bus terminal controller. Data can be exchanged with TwinCAT, or with the
KS8000 software, by way of PLC variables. PLC variables are all the
addressed variables on the BC8000 above address 128. This applies to
the input and output process images. The default setting is for the data to
have a length of 16 bytes. The starting address and the length of the data
can both be changed with the aid of the KS2000 software. It should be
noted here that the highest address that can be set is 511.
TwinCAT as the Master
The serial interface is selected under "Miscellaneous" from the System
Manager. The COM port is to be set, and the parameters set to 19200
baud, "even" parity, "8" databits, "1" stopbit. These parameters are fixed,
and can not be changed.
It is also necessary that the lengths of the input and the output data agree.
A BK8000 is entered into the System Manager, and terminals can be
selected, as shown in the figure below, in order to reach the 16 bytes of
input and output. Four KL3002s yield 16 bytes. Which terminal is used is
not significant, as it can be renamed in the System Manager. What is
important that neither less nor more than 16 bytes are configured.
TwinCAT example
KS8000 as the Master
The KS8000 software is the OCX for the serial communication with the
BK8000 and BK8100 bus couplers. This software tool can also be used to
control the BC8000 and the BC8100. The restriction here is that access is
limited to the PLC variables.
The COM port is to be set, and the parameters set to 19200 baud, "even"
parity, "8" databits, "1" stopbit. These parameters are fixed, and can not be
changed.
It is also necessary for the lengths of the input and output data to agree.
The default setting for these is 16 bytes or 8 words of input and output.