Beckhoff BC9000 Documentation page 34

Configuration
Background Time
Time for the processing of the communication via the fieldbus (includes program download, debugging, etc.).
PLC Var. Offs IN
Start offset of the data exchange variables in the input area of the BC process image
PLC Var. Offs OUT
Start offset of the data exchange variables in the output area of the BC process image
AMS Response during download
Can be disabled for older Bus Terminal Controllers (e.g. BC2000 and BC3100) for compatibility reasons.
Newer bus controller firmware versions acknowledge the receipt of individual download sequences. This
checkbox must therefore be activated (in all cases for BC9000).
Start with Configuration Error
Even if the configured BC9000 is not connected to the network, it is possible to start the TwinCAT system if
this checkbox is enabled.
Retain Data
Store Retain Data: Activates the support of remanent data in the Bus Terminal Controller.
Size: Size of the remanent marker area within the Bus Terminal Controller (%Mx0 ... %Mxyy).
K-bus update
Double Cycle: Activates execution of I/O cycles (K-bus update) within the BC station before and after each
PLC cycle.
Before PLC: A K-bus update will be carried out before executing the PLC cycle.
After PLC: A K-bus update will be carried out after executing the PLC cycle.
Firmware Update (via COMx)
This function can be used to update the BC firmware.
Variable tab
After adding variables below the tree entry PLC Variables you will see the dialog for the selected variable on
the right-hand side, as described in the Variables Information section.
Choose meaningful names for the data exchange variables, because they will be used as variable names in
the local BC process image when Variable information is exported. After this you can link the data exchange
variables with existing tasks.
Sample configuration of a Bus Terminal Controller
The image below shows both data exchange variables and fieldbus variables. The Bus Terminal Controller
managed terminals 4 to 9 locally.
34 Version: 4.0.0 BC9000 and BC9100