MARK VI术语表

ADL

Asynchronous Device Language, an application layer protocol used for I/O

communication on IONet.

application code

Software that controls the machines or processes, specific to the application.

ARCNET

Attached Resource Computer Network. A LAN communications protocol developed

by Datapoint Corporation. The physical (coax and chip) and datalink (token ring and

board interface) layer of a 2.5 MHz communication network which serves as the

basis for DLAN+. See DLAN+.

ASCII

American Standard Code for Information Interchange. An 8-bit code used for data.

attributes

Information, such as location, visibility, and type of data that sets something apart

from others. In signals, an attribute can be a field within a record.

Balance of Plant (BOP)

Plant equipment other than the turbine that needs to be controlled.

baud

A unit of data transmission. Baud rate is the number of bits per second transmitted.

Bently Nevada

A manufacturer of shaft vibration monitoring equipment.

bind

A toolbox command in the Device menu used to obtain information from the SDB.

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BIOS

Basic input/output system. Performs the controller boot-up, which includes hardware

self-tests and the file system loader. The BIOS is stored in EEPROM and is not

loaded from the toolbox.

bit

Binary Digit. The smallest unit of memory used to store only one piece of

information with two states, such as One/Zero or On/Off. Data requiring more than

two states, such as numerical values 000 to 999, requires multiple bits (see Word).

block

Instruction blocks contain basic control functions, which are connected together

during configuration to form the required machine or process control. Blocks can

perform math computations, sequencing, or continuous control. The toolbox receives

a description of the blocks from the block libraries.

board

Printed wiring board.

Boolean

Digital statement that expresses a condition that is either True or False. In the

toolbox, it is a data type for logical signals.

bus

An electrical path for transmitting and receiving data.

bumpless

No disruption to the control when downloading.

byte

A group of binary digits (bits); a measure of data flow when bytes per second.

CIMPLICITY

Operator interface software configurable for a wide variety of control applications.

CMOS

Complementary metal-oxide semiconductor.

COI

Computer Operator Interface that consists of a set of product and application specific

operator displays running on a small panel pc hosting Embedded Windows NT.

COM port

Serial controller communication ports (two). COM1 is reserved for diagnostic

information and the Serial Loader. COM2 is used for I/O communication

G-2

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Glossary of Terms Mark VI System Guide GEH-6421F, Vol. I

configure

To select specific options, either by setting the location of hardware jumpers or

loading software parameters into memory.

CRC

Cyclic Redundancy Check, used to detect errors in Ethernet and other transmissions.

CT

Current Transformer, used to measure current in an ac power cable.

datagrams

Messages sent from the controller to I/O blocks over the Genius network.

data server

A PC which gathers control data from input networks and makes the data available

to PCs on output networks.

DCS (Distributed Control System)

Control system, usually applied to control of boilers and other process equipment.

dead band

A range of values in which the incoming signal can be altered without changing the

output response.

device

A configurable component of a process control system.

DDPT

IS200DDPT Dynamic Pressure Transducer Terminal Board that is used in

conjunction with the IS200VAMA VME Acoustic Monitoring Board that is used to

monitor acoustic or pressure waves in the turbine combustion chamber.

DIN- rail

European standard mounting rail for electronic modules.

DLAN+

GE Industrial System's LAN protocol, using an ARCNET controller chip with

modified ARCNET drivers. A communications link between exciters, drives, and

controllers, featuring a maximum of 255 drops with transmissions at 2.5 MBPS.

DRAM

Dynamic Random Access Memory, used in microprocessor-based equipment.

EGD

Ethernet Global Data is a control network and protocol for the controller. Devices

share data through EGD exchanges (pages).

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G-3

EMI

Electro-magnetic interference; this can affect an electronic control system

Ethernet

LAN with a 10/100 M baud collision avoidance/collision detection system used to

link one or more computers together. Basis for TCP/IP and I/O services layers that

conform to the IEEE 802.3 standard, developed by Xerox, Digital, and Intel.

EVA

Early valve actuation, to protect against loss of synchronization.

event

A property of Status_S signals that causes a task to execute when the value of the

signal changes.

EX2000 (Exciter)

GE generator exciter control; regulates the generator field current to control the

generator output voltage.

EX2100 (Exciter)

Latest version of GE generator exciter control; regulates the generator field current

to control the generator output voltage.

fanned input

An input to the termination board which is connected to all three TMR I/O boards.

fault code

A message from the controller to the HMI indicating a controller warning or failure.

Finder

A subsystem of the toolbox for searching and determining the usage of a particular

item in a configuration.

firmware

The set of executable software that is stored in memory chips that hold their content

without electrical power, such as EEPROM.

flash

A non-volatile programmable memory device.

forcing

Setting a live signal to a particular value, regardless of the value blockware or I/O is

writing to that signal.

frame rate

Basic scheduling period of the controller encompassing one complete

input-compute-output cycle for the controller. It is the system dependent scan rate.

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Glossary of Terms Mark VI System Guide GEH-6421F, Vol. I

function

The highest level of the blockware hierarchy, and the entity that corresponds to a

single .tre file.

gateway

A device that connects two dissimilar LAN or connects a LAN to a wide-area

network (WAN), PC, or a mainframe. A gateway can perform protocol and

bandwidth conversion.

Graphic Window

A subsystem of the toolbox for viewing and setting the value of live signals.

health

A term that defines whether a signal is functioning as expected.

Heartbeat

A signal emitted at regular intervals by software to demonstrate that it is still active.

hexadecimal (hex)

Base 16 numbering system using the digits 0-9 and letters A-F to represent the

decimal numbers 0-15. Two hex digits represent 1 byte.

HMI

Human Machine Interface, usually a PC running CIMPLICITY software.

HRSG

Heat Recovery Steam Generator using exhaust from a gas turbine.

ICS

Integrated Control System. ICS combines various power plant controls into a single

system.

IEEE

Institute of Electrical and Electronic Engineers. A United States-based society that

develops standards.

initialize

To set values (addresses, counters, registers, and such) to a beginning value prior to

the rest of processing.

Innovation Series Controller

A process and logic controller used for several types of GE industrial control

systems.

I/O

Input/output interfaces that allow the flow of data into and out of a device.

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G-5

I/O drivers

Interface the controller with input/output devices, such as sensors, solenoid valves,

and drives, using a choice of communication networks.

I/O mapping

Method for moving I/O points from one network type to another without needing an

interposing application task.

IONet

The Mark VI I/O Ethernet communication network; controlled by the VCMIs.

insert

Adding an item either below or next to another item in a configuration, as it is

viewed in the hierarchy of the Outline View of the toolbox.

instance

Update an item with a new definition.

item

A line of the hierarchy of the Outline View of the toolbox, which can be inserted,

configured, and edited (such as Function or System Data).

IP Address

The address assigned to a device on an Ethernet communication network.

LCI Static Starter

This runs the generator as a motor to bring a gas turbine up to starting speed.

logical

A statement of a true sense, such as a Boolean.

macro

A group of instruction blocks (and other macros) used to perform part of an

application program. Macros can be saved and reused.

Mark VI Turbine controller

A version of the Innovation Series controller hosted in one or more VME racks that

perform turbine-specific speed control, logic, and sequencing.

median