ABB Advant Fieldbus 100 User Manual

ABB Advant Fieldbus 100 User Manual

Product Overview

Advant Fieldbus 100 (AF 100) is a high performance fieldbus, which is used for:

• Communication between Advant Controllers

• Communication between Advant Controllers and S800 I/O Stations, AC 800M

controllers, AC 100 OPC Server, and the equipments developed and sold by

other ABB companies.

In an AF 100 bus, it is possible to reach up to 80 stations within a total physical

distance of up to 13300 meters (43300 feet).

Advant Fieldbus supports three transmission media:

• Twisted pair (Twp)

• Coaxial (RG59 and RG11)

• Optical media.

An AF 100 bus can be built up with all the three media, where a part of one kind of

media is a specific segment.

The following rules apply to the segments:

• To each twisted pair segment, 32 stations can be connected, and the maximum

segment length is 750 meters (2500 feet)

• The coaxial segment can be:

– 300 meters (1000 feet) with cable RG59 or

– 700 meters (2300 feet) with cable RG11.

• The optical media is only used in point-to-point communication, and it allows

the total length of a bus segment to be up to 1700 meters (5500 feet).

• If back-to-back coupled optical segments are used, it is possible to reach up to a

physical length of 13300 meters (43300 feet).

An Advant Fieldbus 100 may be installed with one or two physical bus lines (single or redundant media).

Two bus lines are chosen when increased availability is required.

The redundant bus line does not enhance the bus bandwidth when both the bus cables are operating.

Advant Fieldbus 100 Redundancy Concept

The Advant Fieldbus 100 redundancy concept contains:

• Media redundancy

• Communication interface redundancy

• S800 I/O Field Communication Interface redundancy.

When redundant media is used, redundancy must be maintained through the whole

bus (this comprises of the bus lines as well as connections of the stations to the bus).

Media Redundancy

The Media redundancy includes redundant cable and redundant modems. A media

redundant AF 100 is configured and connected as in Figure 1.

The maximum difference in cable length between the redundant cables must be less

than 1200 meters between any two stations throughout the whole bus.

Introduction to the concept

Communication interfaces: Connection of different types of devices, e.g. Advant Controller 70 with integrated twisted pair modem, Advant Controller 110 via CI626 or CI627. Some of the interfaces can be used as bus managers and participate in bus master functions.

Communication methods

Process data transfer: Managed via cyclic data packets (CDP), which are configured with parameters such as signal identification, cycle time, size and direction, and data is transferred cyclically.

Message transmission: Point-to-point communication for the transmission of identification, configuration data and events, based on event-driven, in the idle slots of the CDP communication.

Bus structure: consists of several segments, the different segments are connected via a modem. Each segment has a maximum length limitation, e.g. 300 metres for RG59 coaxial cable segments, 750 metres for twisted pair segments etc.

Configuration Methods

Communication Interface Configuration: Different communication interfaces are configured in different ways, e.g., CI520 and CI522 are used in Advant Controller 400 Series, which need to be set to operation status and will affect the scan table when adding, deleting or updating the sending DSPs .

Data Set Peripheral (DSP) Communication Configuration: The number of DSPs that can be handled by different controllers varies, e.g., about 4000 for Advant Controller 400 Series. Configuration requires the setting of relevant parameters, such as transmission interval, signal identification, etc.

Event set configuration: For the Advant Controller 110 or 70 to send time-stamped process events to the 400 Series, the EVS element needs to be configured on the sending and receiving side, which is realised via message transmission.

Installation start-up

Cable installation: Twisted pair, coaxial cable and optical fibre can be installed in different ways. For twisted-pair connection, attention should be paid to termination, grounding and minimum distance; for coaxial cable installation, termination and grounding should be carried out at both ends.

Device startup: The startup steps of each device are different, such as Advant Controller 70 startup needs to configure CDP and select station address; S800 I/O station needs to be configured and started by the superior controller after it is started.

Bus Expansion: Single media bus expansion can interfere with communication; redundant cables can be expanded one by one; changing the length of the logic bus requires restarting the bus and following specific steps.