PM803F 3BDH000530R1 ABB

Controller redundancy can be achieved by installing two

AC 800F. To ensure quick and smooth takeover by the secondary 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 synchronized. All inputs and outputs are designed to support redundant

operation. 

AC 800F opens up the flexibility of Fieldbus

technology to the user. The AC 800F collects

and processes diagnostic and process data

from four Fieldbus lines, which may be of different types. It does this in addition to the

tasks of a “conventional” process station.

The AC 800F is available in two versions:

• 4 MB static RAM, 4 MB EPROM

• 16 MB synchronous dynamic RAM,

 8 MB EPROM

Up to 4 (different) fieldbus modules can be

plugged into the AC 800F. The communication

with other controllers runs via Ethernet.

The AC 800F optionally provides several levels

of redundancy:

• device redundancy with 2 AC 800F

• power supply redundancy (24 V DC)

• Ethernet communication redundancy

 (standard)

• Cable redundancy for Profibus DP,

 requires external equipment (RLM01)

The data protection is made via battery back-up

by Ethernet or battery modules with appropriate

functionality. 

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