ProSoft Technology PS-QS-1x10-0781 - Manual (Page 68)

FieldServer Configuration Manual Page 68 of 90
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Notes:
1. The Primary fieldServers 1 & 2 each have 2 virtual FieldServers within them referred to as:

Virtual FieldServer on Tier 1 or SCADA Tier virtual FieldServer

Virtual FieldServer on Tier 2 or PEX Tier Virtual FieldServer.
2. The PEX Tier virtual FieldServers are connected to the Main PLCs via P1 to P6
3. The Information Clients receive ALL the data via the R1 connection ports on the SCADA Tier virtual
FieldServers.
4. The SCADA Tier virtual FieldServers are not connected directly to any PLCs. These virtual FieldServers get all
their data from either the PEX Tier virtual FieldServers or from the physical FieldServers 3 & 4.
5. The SCADA Tier virtual FieldServer 1 normally gets its data from PEX Tier virtual FieldServer 1 (via virtual
network connection VN) AND from physical FieldServer 3.
6. If either physical FieldServer 1 fails, the information Client will get data from FieldServer 2.
7. If either physical FieldServer 3 or 4 fails, then the FieldServer 1 or 2 SCADA virtual tier will get data from the
other auxilary physical FieldServer.
8. If the FieldServer1 SCADA Tier virtual FieldServer cannot get data from FieldServer 1 PEX Tier virtual
FieldServer via virtual network connection VN, it will get the data from FieldServer 2 PEX Tier virtual
FieldServer via physical network connections N1 or N2. Thus if a serial cable on FieldServer 1 is disconnected,
the SCADA virtual FieldServer will automatically get the data from the FieldServer 2 PEX virtual FieldServer.
9. The thick lines represent all possible logical connections from FieldServer 1 PEX Tier virtual FieldServer to the
other FieldServers that it can communicate with. The solid lines are the default connections, and the dotted
lines are the backup connections that are only used if there is a failure.
10. If the Data Array name contains the string 'nocop' then its data will not be copied to the standby FieldServer.
10.3.8 Configuring the FieldServer for Hot Standby Mode 2
10.3.8.1 Hot Standby Status Function
Hot Standby Status Function provides the status of the FieldServers. The offset number and the value in the Data
Array are as follows:
Data Array Offset Value Description
0
1 Primary OK
1 1 Secondary OK
2 1 Primary is active
3 1 Secondary is active
4 1 Hot standby system failure
5 X Number of times primary has become active
6 X Number of times secondary has become active
23 1 Hot standby hubs not on independent networks
24 1 Somewhere a backup connection used
Example:
Data Arrays
Data_Array_Name , Data_Format , Data_Array_Length , Data_Array_Function
DA_HS_Status
, UINT16 , 32 , Hot_Standby_Status_Array