ProSoft Technology PS-QS-1x10-0781 - Manual (Page 63)

FieldServer Configuration Manual Page 63 of 90
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: (408) 262-2299 Fax: (408) 262-2269 Toll Free: (888) 509-1970 email: [email protected]
10.3 Hot Standby Mode 2 (Dual Redundant Mode)
In this mode, both the Primary and the Secondary system are continuously active and the Data Arrays of both
systems are continually updated. Each system keeps an image of what is happening in its complementary system.
Figure XII shows how the dual image allows for multiple data paths, which in turn provide a high level of data
redundancy.
Hot Standby Mode 2 is intended for more complex applications where requirements are more stringent.
Consequently, configuration is more complex.
N
2 P 1 P 2 P 3 P 5 P 6 P 7 P 8
V
N
N
1 R 1 R 2 P 4
N
2
P
1
P 2 P
3
P
5
P
6
P
7
P 8 V N N
1
R
1
R
2
P
4
N 2 P 1 P 2 P 3 P 5 P 6 P 7 P 8
V
N N 1 R 1 R 2 P 4
N
2
P
1
P
2
P
3
P
5
P
6
P
7
P
8
V N N
1
R
1
R
2
P
4
N
2 P 1 P 2 P 3 P 5 P 6 P 7 P 8
V
N
N
1 R 1 R 2 P 4
N
2
P
1
P 2 P
3
P
5
P
6
P
7
P 8 V N N
1
R
1
R
2
P
4
N 2 P
1
P 2 P
3
P
5
P
6
P
7
P 8
V
N N 1 R
1
R
2
P
4
N
2 P 1
P
2 P 3 P 5 P 6 P 7
P
8
V N N
1
R
1
R
2 P 4
Physical Hot
Standby
FieldServer 1
with two Virtual
FieldServers
X
PLC2 PLC 1
Physical Hot
Standby
FieldServer 2
with two Virtual
FieldServers
X X
Information Client
X
X
RS-232 Data Transfers
External Data Transfer over
physical Ethernet connection
Internal Data Transfer over
virtual Ethernet connection
Bad Data
X
Bad Connection
X
KEY
Figure XII - Diagram Showing Data Integrity achieved using Virtual FieldServer Concept even with cable failures and bad data.
Mode 2 Hot Standby introduces the following new concepts to FieldServer configuration.

Single Port Server

Dual Port Server

Tiers – SCADA and PEX

Keepalive Map Descriptors

Server Name