GE EX2100 - Manual (Page 75)

EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections •••• 4-19
Data Highway Connections
The Data Highway integrates
several different single
control systems. The EX2100 exciter communicates over the same data highway as the Mark VI
turbine control and the HMI. A typical exciter connection to the redundant Unit Data
Highway (UDH) network is shown in Figure 4-12. This shows redundant control
with two ACLAs. The UDH is implemented using commercially available fast
Ethernet switches.
10Base-T cabling is used for short distances between the controller and the T-switch,
and any local HMI. The 10BaseT ports in the ACLA and the T-switch are for RJ-45
connectors. The maximum distance for local traffic at 10 Mbps using unshielded
twisted pair cable is 100 m.
100Base-FX fiber optics can be used for longer distance communication between the
local controllers and the central control room. The 100BaseFX ports in the T-switch
and the Ethernet switch are for SC type fiber-optic connectors. The maximum
distance at 100 Mbps using 100BaseFX fiber-optic cables is 2 km. Redundancy can
be obtained by using two T-switches with an interconnecting cable.
Ethernet Port,
RJ-45
EN
E
T
CO
M
2 1
S
T A
T U
S
ACLA
H1A
g GE Industrial Systems
EN
E
T
CO
M
2 1
S
T A
T U
S
ACLA
H1A
g GE Industrial Systems
From other Units From other Units
From other Controllers From other Controllers
T-Switch B T-Switch A
100Base-FX
connections
Local Control Area
To local HMI
Viewer,
10Base-T
10Base-T
connections
Exciter Control
Cabinet
Central Control Room
Fast
Ethernet
Switch A
Fast
Ethernet
Switch B
Figure 4-12. Unit Data Highway Connections