REDUNDANT ARCHITECTURE
REDUNDANCY
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1TGC908004
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6.
Redundancy
6.1.
Redundant Architecture
A redundant system requires two Digital Gateway connected to the same internal switchgear
bus. One Digital Gateway acts as Primary and the other acts as a Backup.
The primary Digital Gateway
polls the M10x via internal Modbus RTU and is responsible for
sending the switching commands, as well as reading the information fed back from the M10x
via the Digital Gateway.
The Backup Digital Gateway
reads the information only and is inhibited from sending switch-
ing commands.
The Primary and Backup Digital Gateway is synchronized using a redundant link cable.
A redundant system does can cover single system failures. Following theoretical failure situa-
tions are covered by a redundant system configuration:
On an active communication link:
•
Failure in a PLC Fieldbus master or failure in a Fieldbus cable connection between one mas-
ter and slave.
•
Failure in a Digital Gateway
or failure at the switchgear bus connection to a single Digital
Gateway
.
Figure 23 Redundant configuration and possible failure scenario – M10x-M
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