![Softing FG-200 HSE/FF User Manual Download Page 51](http://html1.mh-extra.com/html/softing/fg-200-hse-ff/fg-200-hse-ff_user-manual_1312374051.webp)
Chapter 7 - Redundancy mode
Version EN-112021-1.30.3
51
7
Redundancy mode
Redundancy mode is possible in all environments/use cases where the FG-200 acts as link active
scheduler.
Redundancy mode is not possible when FG-200 acts as a visitor host or when the serial RS232 interface of
the FG-200 is used for Modbus communication.
7.1
Redundancy concept
FOUNDATION fieldbus is a distributed control architecture that provides increased availability compared to
centralized control architectures.
To improve the availability of the FG-200 HSE/FF Modbus, it is possible to combine two FG-200 which then
form a redundant Linking Device:
A redundant Linking Device (also called "a redundant set of devices") consists of two physical Linking
Devices that are connected to the same HSE subnet and to the same H1 links. The redundant set of devices
behaves like one logical Linking Device. By duplicating the physical Linking Device, it is possible to tolerate
one fault in one of the two devices.
In a redundant set of devices one Linking Device acts as primary device and performs actively all
communication functions, including the Link Active Scheduler (LAS) function on the H1 links. In a redundant
set it is the primary device that has to be addressed by Hosts and configuration tools.
The second Linking Device, named secondary device, acts as backup device. It receives automatically the
same configuration as the primary device, but uses different node addresses on the H1 links and a different
IP address on HSE.
The secondary device is able to take over the function of the primary device if the primary device fails. In
that case the Linking Device is reduced to a non-redundant system that is not able to tolerate any further
failure. Therefore it is necessary to replace the defective device as soon as possible to recover
redundancy.
The secondary device acts as Backup Link Master on each H1 link attempting to take over the LAS role if
required. Additional Link Master Devices may be configured to act as Backup Link Master on the H1 links.
Summary of Contents for FG-200 HSE/FF
Page 1: ...Softing Industrial Automation GmbH FG 200 HSE FF Modbus User Manual Version EN 112021 1 30 3...
Page 49: ...Chapter 6 Using the web interface Version EN 112021 1 30 3 49...
Page 56: ...FG 200 HSE FF Modbus User Manual 56 Version EN 112021 1 30 3...
Page 77: ...Chapter 10 ATEX Type Examination Certificate Version EN 112021 1 30 3 77...
Page 78: ...FG 200 HSE FF Modbus User Manual 78 Version EN 112021 1 30 3...
Page 81: ...Chapter 12 Declarations of conformity Version EN 112021 1 30 3 81...