BECKHOFF BC7300 - Manual (Page 11)

Basic Principles
BC7300 11
Operating Modes of the Bus Terminal
Controller
Immediately after being switched on, the Bus Terminal Controller checks,
in the course of a “self test”, all the functions of its components and the
communication of the K-Bus. The red I/O LED blinks while this is
happening. After completion of the self-test, the Bus Terminal Controller
starts to test the attached Bus Terminals (in a "Bus Terminal test"), and
reads in the configuration. An internal structure list is created from the Bus
Terminal configuration. In case of an error, the Bus Terminal Controller
enters the „STOP“ state. Once the start-up has completed without error,
the Bus Terminal Controller enters the "fieldbus start" state.
Start-up behaviour of the
Bus Terminal Controller
Power On self test
Bus Terminal test
Structure list
PLC start /
Communication start Stop
OK Error
Mechanical structure
The system of the Beckhoff Bus Terminals is characterised by low physical
volume and high modularity. When planning a project it must be assumed
that at least one Bus Coupler and a number of Bus Terminals will be used.
The mechanical dimensions of the Bus Couplers are independent of the
fieldbus system. If large plugs are used, such as, for example, certain bus
plugs for the Profibus, the maximum height of the housing can be
exceeded.