3.3
Unit Control Layer
The Unit Control layer or Unit Data Highway (UDH) provides the network connections that support continuous operation of
the process equipment, including controller sets (general-purpose, safety loops, turbine-specific, static starter, exciter) and
HMIs. The UDH is an Ethernet-based network that provides direct or broadcast peer-to-peer communications between a
controller set and an operator/maintenance interface. The controllers operate at a fundamental rate called the
,
which is configurable, and is dependant on the controller processor type, the amount of application code being run, and other
loads.
Mark VIe controllers and HMIs use the
to exchange real-time data, which on the UDH is based on UDP/IP (for
data exchange) and HTTP (for configuration of pages). In addition,
is used by the ToolboxST application to
download to the controller over the UDH. Alarms and capture buffer uploads (that feed trip logs) are also through the SDI
protocol.
Note
Current controls systems network architecture has UDH, PDH, and MDH connections on a common set of network
switches and media trunks.
The UDH connections to the controllers and HMIs are unshielded twisted pair (UTP) Cat 5e from edge switches. This
redundant
allows network connectivity even if one cable or switch is faulty. Redundant networks still
comprise one logical network.
The following figure displays the UDH network with connections to the controllers and HMIs.
Mark VIe
Controller
Set
Mark VIeS
Controller
EX2100 e
Excitation
Control
LS2100 e
Static Starter
Control
Mark VIe
Controller
Mark VIe
Controller
Unit Data Highway (UDH)
Mark Stat
Wind Power
Converter
Mark VIe
Controller
R
S
T
SIL 3
Functional
Safety
SecurityST
Cyber
Security
Management
System
P
D
H
P
D
H
P
D
H
Mark VIe
HMI
Mark VIe
Historian
Unit Data Highway Example
86
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