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EX2100 User’s Guide GEH-6632 Chapter 4 Terminal Board I/O and Equipment Connections
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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
ENET
COM
2
1
S
T
A
T
U
S
ACLA
H1A
g
GE
Industrial
Systems
ENET
COM
2
1
S
T
A
T
U
S
ACLA
H1A
g
GE
Indu strial
Systems
From other Units From other Units
From other Controllers From other Controllers
T-Switch BT-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