BECKHOFF BC3150 - Manual (Page 102)

Safety Instructions
100 Fieldbus Components
Moving from BCxx00 to BXxx00
File names
At Bus Terminal Controller of BXxx00 series, libraries are called *.lbx, and programs are saved as *.prx.
Flag variables
Flag variables
The flag variables
•
of BCxx00 are allocated from %MB0...%MB511 (except BC9000/BC9100: %MB0...%B4095)
•
of BXxx00 are allocated from %MB0...%B4095
Status information such as K-Bus/fieldbus status or cycle tick is not copied to the BX (this information is available as
a function in TcSystemBX.lbx).
The allocated flags don't operate as retain variables.
Retain data
The retain data have to be declared as VAR_RETAIN. Up to 2 kByte are available.
PLC variables
In the default configuration, the PLC variables start at %IB1000 and %QB1000.
Large model
No longer available in the BX version. Max. memory BX-Controller 256 kByte/ BCxx50 Controller 48kByte.
Task time
The task time is specified in the PLC Control. It should be set to a realistic value (measuring of PLC cycle time and K-
Bus). The background time is no longer used.
Task configuration
A maximum of one task is available. This task has to be configured.
PLC and Field Bus Terminals
On standard bus terminal controllers (BCxx00) it was possible to choose if a bus terminal is allocated to the fieldbus
or to the local PLC. In default configuration of an BXxx00 all bus terminals are allocated to the local PLC. An
allocation to the fieldbus is not possible here.
Moving from PC to BCxx50/BXxx00
File names
At Bus Terminal Controllers of BCxx50 and BXxx00 series, libraries are called *.lbx, and programs are saved as
*.prx.