BECKHOFF BC2000 - Manual (Page 20)

Settings in the TwinCAT System Manager
19 BC2000
Remanent Variables
Retained or remanent variables are data that retain their value when
voltage is not present. In PLC Control this data is placed in the allocated
flags area. Following the default setting, this means that all the variables
from %MB0 - %MB63 are RETAIN data. The maximum setting is 512 bytes.
Terminal Bus Update
Double Cycle Terminal bus inputs before the PLC cycle
Terminal bus outputs after the PLC cycle
Before PLC Terminal bus inputs and outputs before the PLC cycle
After PLC Terminal bus inputs and outputs after the PLC cycle
Program Download via the Fibre Optic Ring
TwinCAT offers a facility for transferring the program to the BC2000 over
the optical fibre ring. To do this, string communication and the Ams/Ads
must be activated in the system manager under the ADS/AMS tab. The
TwinCAT system is started after the configuration has been saved. Now the
BC2000 target system can be selected in PLC Control.
Selection of the target
platform
(Only for TwinCAT) When TwinCAT PLC Control is restarted, the program asks for the target
platform, i.e. the device on which the user will want his program to run.
TwinCAT offers two target platforms, the PC as a controller and the BC2000
coupler. For the program transfer with the bus terminal controller there are
again two possibilities. „AMS“ is for communication over the fieldbus, while
the „serial“ communication takes place via the PC’s serial interface and the
BC2000 programming interface.
Selection of the target
system Once the program has been written, the target system is selected under the
„Online“ symbol bar. In this example, the C1220 with the Box1 and the Run-
Time1 of the bus terminal controller.