Switch By System
Tankvision
8
Hauser
4
Switch By System
4.1
Operation
The diagram below shows an example of a pair of Multi Scan NXA83 used in the Switch By
System redundancy mode.
NXA83_System-configuration_Switch-by-system
1
Tankvision Professional NXA85 Workstation
2
Ethernet
3
Tankvision Multi Scan NXA83
4
Control link RS232
5
Fieldbus protocol
6
Proservo
7
Promonitor
8
Prothermo
9
Tank Side Monitor
10
Micropilot
The two NXA83 have a number of field loops (2 Enraf BPM in this example) connected to
both Multi Scan NXA83.
There are also 2 Control links connected between the NXA83, these are used to transfer data
between the systems, one for each direction of data transfer.
In normal operation one Multi Scan NXA83 will be in Live Polling mode, that is, polling for
all field data from the gauges. The other Multi Scan NXA83 will be in Redundant Link mode,
and it will be getting data from the live Multi Scan NXA83 via one of the Control Links.
Therefore both Multi Scan NXA83 will have live field data, which will be displayed on screen
and be available on any slave (Modbus etc.) port or OPC connection. Slave ports may be
configured to not reply on the passive system, to mimic functionality in older equipment
such as the Datacon.
5
5
4
4
8
8
10
3
9
3
1
1
2
2
7
6
