ABB AC 800F Controller Redundancy

AC 800F Controller Redundancy 

Controller redundancy can be achieved by installing two 

AC 800F. To ensure quick and smooth takeover by the secon

dary AC 800F in case the primary AC 800F fails, a dedicated 

redundancy communications link through the second Ethernet 

module makes sure that both AC 800F are always synchro

nized. All inputs and outputs are designed to support redundant 

operation.

Profibus Line Redundancy 

Using the Redundancy Link Module RLM 01 will do the conver

sion of one simple, non-redundant Profibus line into two recip

rocally redundant lines. 

You can position the Redundancy Link Module RLM 01 directly 

after a Profibus module (master), before a bus segment with 

several slaves or before an individual slave. PROFIBUS sta

tions with redundant couplers can be directly connected to the 

PROFIBUS set redundant by RLM 01. Stations with only one in

terface can be optionally assigned to the one or other line. 

For technical description dates of the Redundancy Link Module 

RLM 01 see document 3BDD011600R0201. 

An alternative solution to the Profibus line redundancy is to use 

a Fiber Optic Ring, for example with the OZD Profi 12M module 

from firm Hirschmann  

AC800F Redundancy together with Profibus Line Re

dundancy 

You can achieve both; controller redundancy and Profibus line 

redundancy by using two AC 800F with one RLM01 each. This 

topology combines the advantages of controller redundancy 

with the one of line redundancy as described in the above 

paragraphs.