Category: ABB

FouNDATIoN Fieldbus Linking Device

LD 800HSE

LD 800HSE serves as a gateway between High

Speed Ethernet (HSE Subnet) and the FOUNDATION

Fieldbus field devices on H1 links. The provision of

data from a H1 link to the HSE Subnet, as well as

from one H1 link to another, is guaranteed by the

communication – typical of FOUNDATION Fieldbus –

between field devices on various H1 links and field

devices on the HSE Subnet. In addition, the client/

server gateway allows function blocks in H1 devices

to be accessed via the HSE interface. LD 800HSE is

also designed for redundancy.

other fieldbus devices

To protect the fieldbus segment and the links, the

Fieldbus Barrier FB 900 series can be used. The PC

900 Power Conditioner provides a higher supply

current for a H1 link. These devices are described

in detail in ABB’s Fieldbus Devices brochure

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.

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.

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.

The basic unit with CPu

The core element of the AC 800F is a high-perform

ance processor with rapid bit processing properties

making it ideal for use in automation technology.

Mechanical design of AC 800F

The AC 800F process station has a mechanical

design similar to that used in programmable logic

controls. Its front panel connection technique makes

it exceptionally easy to assemble and to service,

also allowing it to be mounted on the wall without

difficulty.

All AC 800F modules are inserted into racks from

the front and secured in position with screws. The

modules are activated using a lock switch, which

conceals the upper screw opening. The lock switch

must be opened to reach the upper screw opening.

This signals the wish to remove the module to the

CPU module, and the fieldbus is automatically shut

down. As a result, the remote I/O and field device

outputs have the opportunity to assume configured

safety values, avoiding undefined states when the

module is removed.

All modules are surrounded by metal casing when

installed, which gives them optimum mechanical and

electrical protection.

All casing materials used are simply screwed together,

allowing them to be separated for future recycling.

Last but not least, Freelance 800F has taken environ

mental protection into account by using a minimal

amount of paint.

Process-level automation: The controller

The AC 800F hardware

The AC 800F has a modular structure. The CPU is

designed as a backplane to which various modules

– power supply units, Ethernet or fieldbus modules

– can be attached in line with the application.

On the fieldbus side, modules for PROFIBUS-DPV1.

FOUNDATION Fieldbus HSE, MODBUS (master/

slave, RTU or ASCII), IEC 608 0-5-101 and CAN for

Freelance Rack I/O are available. The fieldbus line

and the connected PROFIBUS slaves are entirely

configured and parameterized using the Control

Builder F engineering tool. No further external tools

are needed for configuration.

PROFIBUS slaves can be integrated into the system

using a GSD1) file or FDT/DTM ).

In the case of FOUNDATION Fieldbus, configuration

takes place using CFF ) or DD4) files. This allows

fieldbus parameterization even without connected

field devices.

The Freelance 800F process level

At the process level, a Freelance 800F system can

consist of several process stations that are connected

with I/O units. You have the option of running these

process stations either redundantly (CPU redundancy,

fieldbus module redundancy) or without redundancy.

Modular plug-in input/output modules are used in

accordance with the type and quantity of process

signals. With AC 800F, fieldbus-compliant compo

nents such as remote I/O or field devices can be

connected.

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.

The Freelance 800F DigiVis operator level

The DigiVis operator stations use PC hardware, either

standard or industrialized in line with the application,

running under the Microsoft Windows operating

system. DigiVis supports dual-monitor operation,

meaning that two monitors can be used on a single

PC, operated using one mouse and one keyboard.

One engineering station and several operator stations

can be installed at the operator level. The Control

Builder F engineering station is used to configure and

commission the system. Usually, portable equipment

such as laptops, which allow configuration both in

the office and on site, is used. The operator level PCs

can also be used as engineering station. A permanent

connection to the engineering system is not neces sary.

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.

The same user-friendly configuration and support

features also apply to operation and observation. The

operator is supported by a mechanism providing not

only information from the plant but also operating

hints. For this purpose, for example, an intuitive

operator interface, logs, and sophisticated alarm and

message management function is available.

As hardware constitutes less of the price of an auto

mation system, the costs for creating user software

become more important, accounting for an average

of more than 50% of the total cost of an automation

project. This makes it clear that the mechanism, by

which cost structures can be changed to the user’s

advantage, must begin with engineering.