The system bus has the following features:

• The ability to cover long distances

• A high data throughput

• Choice of various transmission media (such as

twisted pair, coaxial cable or fiber optics)

• A flexible network layout

• Easy connection to a higher plant management

level through the OPC standard

• Pre-programmed routines in the event of faults

• Good EMC properties

• Ability to switch bus members on and off during operation

• Highest availability through redundancy

Station bus (CAN bus)

When Freelance I/O racks are used, communication

takes place via the station bus. The station bus

complies with the CAN (Controller Area Network)

industrial standard.

The station bus has the following features:

• The ability to cover short to medium distances

• High data throughput, update times for signals

from  ms (binary) or 10 ms (analog)

• Exceptional degree of transmission safety and

interference immunity (Hamming distance = 6)

• Pre-programmed routines in the event of faults

• Good EMC properties

• Ability to switch bus members on and off during operation

• Automatic initialization of newly mounted modules