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

The DigiVis operator station has a built-in OPC client,

which permits you to access data from external

OPC servers. Using this, for example, data from a

SIEMENS control unit can be integrated into a cus

tom graphic in DigiVis.

As several OPC gateways can be used in the Free

lance system, server redundancy can be established

using OPC clients that support this function. * The

Control Builder F engineering software supports this

with the redundant OPC gateway configuration.