GE Mark VIe System Manual page 196

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 variable to a particular value, regardless of the value blockware or I/O is writing to that variable.
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.
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 LANs or connects a LAN to a wide-area network (WAN), computer, or a
mainframe. A gateway can perform protocol and bandwidth conversion.
I/O device Input/output hardware device that allows the flow of data.
I/O drivers Interface the controller with input/output devices, such as sensors, solenoid valves, and drives, using a choice
of communication networks.
IONet The Mark VIe I/O Ethernet communication network.
IP Address The address assigned to a device on an Ethernet communication network.
Logical A statement of a true sense, such as a Boolean.
LS2100e Static Starter control GE's current state-of-the-art control for static starter control systems, used to bring a gas
turbine up to starting speed.
Macro A group of instruction blocks (and other macros) used to perform part of an application program. Macros can be
saved and reused.
Modbus A serial communication protocol developed by Modicon for use between PLCs and other computers.
Module A collection of tasks that have a defined scheduling period in the controller.
Multicast The delivery of a message or Information to a group of destination computers simultaneously in a single
transmission from the source.
Online Online mode provides full CPU communications, allowing data to be both read and written. It is the state of the
toolbox when it is communicating with the system for which it holds the configuration. Online is also, a download mode
where the device is not stopped and then restarted.
Period The time between execution scans for a Module or Task. Also a property of a Module that is the base period of all
of the Tasks in the Module.
Pin Block, macro, or module parameter that creates a variable used to make interconnections.
Plant Data Highway (PDH) Ethernet communication network between the HMI Servers and the HMI Viewers and
workstations.
Potential Transformer (PT) Measures voltage in a power cable.
Programmable Logic Controller (PLC) Designed for discrete (logic) control of machinery. It also computes math
(analog) function and performs regulatory control.
QNX A real time operating system used in the controller.
Relay Ladder Diagram (RLD) A ladder diagram that represents a relay circuit. Power is considered to flow from the left
rail through contacts to the coil connected at the right.
196 GEH-6721_Vol_I Mark VIe and Mark VIeS Control Systems Volume I
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