Unit Sequencing
Executes start permissives, auxiliary sequencing, purge, ignition, acceleration, synchronization, load control and normal shutdown logic.
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MARK CONTROL / TURBINE CONTROL
Mark Gas Turbine Control System
The Mark control platform performs gas turbine sequencing, speed and load control, fuel control, protection, alarms and operating diagnostics. Mark VIe connects field equipment with operator and maintenance environments through modular controllers, distributed I/O, deterministic I/O networks and integrated engineering tools.
UPGRADESPARTSSERVICES
MK
System Role
From turning gear, purge, ignition and acceleration to synchronization, loaded operation and shutdown, the control logic coordinates field I/O, fuel and actuators, protection circuits, generator systems and operator interfaces. Modernization requires a coordinated review of application logic, field wiring, networks, HMI and the available outage window.
SYSTEM OVERVIEW
Functions and
Upgrade Scope
Closed-loop Control
Processes speed, temperature, fuel, load and actuator feedback to perform real-time regulation for the unit application.
Protection and Diagnostics
Integrates alarms, trips, sequence of events, trends and I/O diagnostics into a common operating and maintenance environment.
Lifecycle Support
Modular hardware supports phased updates; migration paths for earlier Mark platforms depend on generation, wiring and the scope that can be retained.
SYSTEM IMAGES
Equipment, Operation and
Engineering Environment
SYSTEM CONTEXT
Functional Structure and Interface Boundaries
Field Equipment
Sensors, speed probes, fuel valves, servos, discrete signals and auxiliary systems form the unit signal and actuation layer.
Terminal Boards and I/O Packs
Field wiring enters through terminal boards and I/O Packs, whose local processors perform acquisition, diagnostics and time stamping.
IONet
A dedicated full-duplex point-to-point I/O network connects controllers with local or remote I/O and can be configured for application-specific redundancy.
Controllers
Controllers execute real-time application logic in simplex, dual or triple-redundant configurations and synchronize variables across redundant controllers.
UDH and Workstations
The control network connects operator, engineering and historian workstations together with other Mark VIe family systems.
TECHNICAL KNOWLEDGE
Technical Highlights
Redundancy
Mark VIe supports simplex, dual and triple-redundant controller configurations; I/O modules and I/O networks may also be arranged as simplex or redundant systems.
Deterministic I/O Network
IONet is a 100 Mb full-duplex point-to-point network for local and distributed control I/O, while I/O Packs perform module-level diagnostics and voting.
Sequence of Events
Discrete I/O can provide 1 ms time stamping to help reconstruct the sequence of trips and abnormal events.
Control Logic and Tools
Application logic can be organized with function blocks, sequential function charts and ladder diagrams and executed at configured frame rates.
Remote I/O and Protocols
Remote I/O can be located near equipment to reduce long field cable runs, while gateways can integrate PROFINET, Modbus, PROFIBUS and Foundation Fieldbus.
Upgrade Review
Before an upgrade, review the running software archive, network topology, ControlST and HMI versions, cabinet hardware, field wiring and applicable technical advisories.
TECHNICAL REVIEW
System Configuration and Upgrade Review
Please prepare the unit model, installed system version, network and I/O configuration, alarm records, and planned outage window.
kongyang@kongyangpower.com