ABBAdvant Fieldbus 100 User Manual

• 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.

Figure 1. An Advant Fieldbus 100 configuration using redundant media

If the Advant Fieldbus 100 contains one or more of CI520, CI526, CI626, CI810 

or PM810 (without the suffix Vx(1)

(1) V1, V2, V3, and so on

 or y(2)

(2) y=A, B, and so on

), it is only possible to use redundant 

coaxial media with a maximum difference of four meters in cable length, between 

any two stations on the bus. A redundant Twisted Pair or Optical media cannot be 

used in this case.

Communication Interface Redundancy Section 1 Introduction

28 3BSE000506-600

Communication Interface Redundancy

Communication interface redundancy is achieved by using a pair of CI522s, CI630s, 

CI631s, CI869s or CI820s, connected to a media redundant bus. Communication 

interface redundancy is available for Advant Controller 400 Series, Advant 

Controller 160, AC 800M controller, and S800 I/O stations. 

Two communication interfaces (CIs) can operate as a pair, where one is Primary and 

the other is Backup in the controller configuration.

Functions of Primary CI

In a redundant configuration, the address of the primary CI is the configured station 

address on the bus.

The primary CI:

• Sends all output CDPs.

• Receives all input CDPs.

• Sends the time synchronization message if the station is configured as time 

synchronization master.

• Handles the normal Service Data communication for the station.

• Supervises that the backup can send on the bus. This is done at a low frequency 

using the service data protocol. 

• Must be configured as bus master if the module is CI522/CI630 or CI631, so 

that the bus master responsibilities are performed

Functions of Backup CI

In a redundant configuration, the address of the backup CI on the bus is the 

configured station address + 80. 

The backup CI:

• Supervises that the primary CI sends its output CDPs properly.

• Sends signal to the controller if the primary CI does not send its output CDPs.

• Receives all input CDPs.

• Responds to Service Data communication with the Primary.

• Must be configured as bus master if the module is CI522, CI630 or CI631. If 

the station number is less than or equal to 47, the backup module performs the 

bus master responsibilities, otherwise it does not.

Communication Interface Redundancy in Advant Controller 400 Series

To connect the CI522 redundant communication interfaces to a twisted pair bus, two 

TC516 modems (or four TC512 modems) are used. See Figure 2. 

To connect the CI522 redundant communication interfaces to a coaxial cable bus, 

four TC625 modems are required.

The TC516 modem has two connections, one for each redundant CI522 and a 

connection to one twisted pair bus cable. TC516 can be used for two redundant 

CI522s as well as for one single CI520V1/CI522/CI526V1.

If communication interface redundancy is used, set the DB-element for 

double time-out. See Double CDP Time-out on page 88.

Communication Interface Redundancy in Advant Controller 160

For configurations with one Advant Fieldbus 100, the communication interface 

CI630/CI631 must be placed at position 2 (non redundant interface) or in position 1 

and 2 (redundant interface) in the Basic Station.

A second and third Advant Fieldbus 100 can be used with AC 160. These can use 

single or redundant communication interfaces. The communication interfaces can 

be placed at position 9 and 10, or 11 and 12, and so on.

S800 I/O Field Communication Interface Redundancy

The redundancy in the S800 I/O Stations is achieved with redundant Field 

Communication Interfaces (FCIs) connected to a media redundant 

Advant Fieldbus 100. In the S800 I/O station, redundancy is achieved with 

redundant S800 communication interfaces sharing the same I/O modules. This