REDUNDANCY REDUNDANT ARCHITECTURE
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6.Redundancy
6.1. Redundant Architecture
A redundant system requires two MNS Digital Gateway connected to the same internal
switchgear bus. One MNS Digital Gateway acts as Primary and the other acts as a Backup.
The primary MNS Digital Gateway polls the M10xvia internal Modbus RTU and is responsible
for sending the switching commands, as well as reading the information fed back from the
M10x via the MNS Digital Gateway.
The Backup MNS Digital Gateway reads the information only, and is inhibited from sending
switching commands.
The Primary and Backup MNS 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 MNS Digital Gateway
or
failure at the switchgear bus connection to a single
MNS Digital Gateway
.
Figure 21 Redundancy configuration and possible failure scenario
If a failure is detected, from one of the 2 cases detailed above an integrated system mecha-
nism ensures a bump less changeover from the ‘Primary’ MNS Digital Gateway to the ‘Backup’
MNS Digital Gateway. All process data, alarms and events and the system status information
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