System architecture

Freelance 800F is divided into an operator level and a

process level. The operator level contains the func

tions for operation and observation, archives and

logs, trends and alarms. Open-loop and closed-loop

control functions are processed in the controllers.

System communication

The operator and process levels communicate with

each other via the system bus (based on Ethernet)

with TCP/IP, where you can choose between various

transmission media such as AUI, twisted pair, fiber

optic or coaxial cable. A Freelance OPC server is

available for connecting to higher-level operator

stations (800xA) or other OPC clients. The real-time

process values and alarms from the Freelance sys

tem can be accessed via OPC. A „C“ programming

interface for Windows programs can be used for

external applications that do not use the standard

OPC interface. The DMS-API is used for this.