DMS-API

The DMS Application Programming Interface pro

vides C programmers with a Windows interface

through which they can access internal Freelance

communications services. This enables them to their

own Windows applications that can read online data

from the Freelance system and modify values.

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.

The trend server option provides a special OPC

gateway that is used by the DigiVis operator stations

for user-defined trend displays. Access to the trend

server is fixed to “read only”, and all trend variables

are automatically available. There is one trend server

per Freelance system.