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Profibus Line Redundancy

Using the Redundancy Link Module RLM 01 will do the conversion

of one simple, non-redundant Profibus line into two reciprocally

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 stations

with redundant couplers can be directly connected to the

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

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 Redundancy

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.

Page

Description

The basic unit, PM 802F and respectively PM803F, cyclically

scans signals from the fieldbus sensors via the corresponding

fieldbus modules, processes these signals according the application

programs installed by the user and sends appropriate

signals to the fieldbus actuators via the fieldbus modules.

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.

Data communication between AC 800F, process and operator

stations runs over the Ethernet system bus on the first Ethernet

module. Data exchange with the engineering station is also carried

via the system bus. Engineering station communications

can involve new or updated configuration files being

downloaded to the process stations, or information about the

connected modules being reported back. When fieldbus modules

are installed or exchanged, the required configuration information

is automatically updated.

Configuration and real-time process data is stored in RAM. To

safeguard this data in case of power loss, the RAM power is

backed up with batteries located either on the Ethernet modules

or on battery modules.

The PM 803F has more memory than the PM 802F and is

therefor capable to handle larger projects. Due to increased

memory size and different technology the buffering times were

reduced.

202

239 164

152

Slot P E1 E2 F1 F2 F3 F4

Technical Data

CPU Intel 80960HT25/75

32-bit RISC Super Scalar processor

up to 150 MIPS

RAM PM802F:

4 MB static read/write memory

battery back up

PM 803F

16 Mbytes synchronous dynamic

read/write memory, battery back up

I/O scan cycle time Selectable by configuration. Depends on

the capabilities of the fieldbus module

Processing time for

1000 instructions < 1.0 ms for binary and 16 bit arithmetic

instructions

< 2 ms for fixed point arithmetic instructions

< 1.5 ms for 32 bit arithmetic instructions

Power consumption:

Basic unit only: PM 802F PM 803F

max. 6.3 W max. 7.8 W

depending on CPU usage and cycle time

Power supply PM 802F PM 803F

115 - 230 V AC SA 801F SA 811F

2 x 24 V DC SD 802F SD 812F

Max. power output see power supply modules

Weight 1.6 kg

max. 5 kg (fully assembled)

Dimensions Width 239 mm, 9.4 inches

Height 202 mm, 8 inches

Depth 164 mm, 6.5 inches