ABB Freelance 800F LD 800P PRoFIbuS DP/PA Linking Device Functions

Functions

The scope of functions provided by the Freelance

system corresponds to the basic supply defined in

IEC 611 1- , in addition to numerous other high

performance, industry-proven functions and function

blocks. They are accommodated in a function block

library and can be supplemented by user-specific

function blocks. While designing the station and

during configuration, the processing capacity and

speed of the process station can be easily adapted

to the demands of the automation task. Program

execution in the process station is based on a task

oriented, real-time multitasking operating system,

leading to a flexible strategy for processing programs.

Different modes are available for task execution:

• Cyclical processing with cycle times from 5 ms upwards

• Fastest-possible processing (PLC mode)

Along with the user tasks, system tasks – in which

functions can also be processed – are automatically

made available. These tasks are executed once in

case of the following events:

- RUN

- STOP

- COLD START

- WARM START (voltage restored)

- REDUNDANCY TOGGLE- ERROR

Up to eight cyclic user tasks and one PLC mode task

can be configured in a process station.

Fieldbus modules

The AC 800F uses the fieldbus modules to collect

and process real-time and diagnostic data. Up to

four fieldbus modules can be mounted into one AC 800F.

The fieldbus modules have the following tasks and

characteristics:

• Electrical isolation between the process and system

• Status LEDs for the module status

• Independent fault detection and fault signaling

• Connection of the fieldbus lines

Ethernet modules

Process stations and the operator and engineering

level in the Freelance 800F system communicate with

each other via Ethernet.

Intelligent linking devices

As the AC 800F possesses the high-speed connec

tion of both PROFIBUS (PROFIBUS DP) and FOUN

DATION Fieldbus (FF-HSE), the slower buses of the

two fieldbus technologies (PROFIBUS PA and FF-H1)

can be connected using intelligent linking devices.

These devices allow to connect several slow buses

to one fast bus, with the advantage that a lot more

field devices can be connected to an AC 800F sta

tion than when the slow fieldbuses are connected directly.

LD 800P PRoFIbuS DP/PA Linking Device

LD 800P is needed to connect PROFIBUS DP to

PROFIBUS PA. The LD 800P Linking Device converts

the physical bus characteristics of the RS 485 inter

face for the PROFIBUS DP into PROFIBUS PA physi

cal bus characteristics according to IEC 61158- ,

enables connected PROFIBUS PA devices to be

supplied with power via the bus, and additionally

allows use in intrinisically safe areas.