NTMC Glossary
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Analog Point - I/O point for reading analog inputs and manipulating analog values. Abbreviation: ANP.

Capacitor - Capacitor Control module I/O point for control of capacitors on the power grid. Each capacitor is mapped to a NTMC core control point, and contains additional configuration parameters relevant to capacitor control algorithms.

Capacitor Control Executive - NTMC module which runs electric utility capacitor control algorithms. It is encapsulated in the CCEX (Capacitor Control Executive) program. It is integrated with (and depends on) the NTMC core services. It is a collection of substations, and various configuration parameters for management of capacitors on a global, substation, or feeder level.

COM - Microsoft's Component Object Model is a software architecture that allows applications to be built from binary software components. For a more detailed description please see http://www.microsoft.com/com/tech/COM.asp

Control Point - I/O point for controlling relays. The NTMC core supports three types: latching control points, timed control points, and momentary control points

Counter - I/O point for reading counters and manipulating integral values. Abbreviation: CNT.

Demand Point - Load management module I/O point for importing demand data. Each demand point is mapped to a NTMC core analog point, and contains additional configuration parameters relevant to load management algorithms.

DCOM - similar to COM, except the technology works over networks, so software components residing on different machines can talk to each other. For a more detailed description please see http://www.microsoft.com/com/tech/DCOM.asp

Descriptor - special kind of display element used to display alphanumeric information about another, associated display element.

Display Element - the simplest one-line diagram available in NTMC graphics library. Display elements represent individual, lowest level system components, such as cables, relays, ground connections, etc., as well as more complex components, such as transformers, meters, capacitor banks, etc.

Display Element Library - A window which contains all available display elements which can be used to graphically model the monitored system.

DNP 3.0 - Distributed Network Protocol, one of industry standard communication protocols. Designed by a committee, now managed and maintained by dnp.org.

Domain - A collection of RUs, which can be displayed in a single window. RUs can be organized into domains based on geographical locations of RUs, on RU model, RU's functionality within the system, etc.

Double Poll - Execution of command which consists of three phases: 1 - Poll of a remote unit, 2 - a wait for preprogrammed number of seconds, and 3 - another poll of the same remote unit.

Evaluator - A small program, written by the operator, used for calculation of I/O point values. Evaluators get interpreted when new data comes in, i.e. they are compiled at run time. Linking to the database is performed every time an I/O point is evaluated.

Feeder - the minimum set of capacitors, various input parameters, and configuration parameters that capacitor control module algorithms can manage together using the same set of policies.

I/O Point – The lowest application level, user configurable software component for managing and displaying data input and output. The NTMC core supports six types: analog points, counters, status points, latching control points, timed control points, and momentary control points. The Load Management module supports two types: load points, and demand points. The Capacitor Control module supports capacitors and feeders. The Meter Reading module supports meters.

Latching Control Point - I/O point for controlling latching relays. Abbreviation: LCP. A latching relay can have one of two possible states: TRUE (1) or FALSE (0). The two possible states are usually assigned names such as ON vs. OFF, CLOSED vs. OPEN, etc. Such a relay does not change its state until appropriate NTMC generated command causes it to do so.

Local Area Network - Abbreviation: LAN. Computer network where all machines usually reside in one building, or a small number of buildings. They are all served by a small number of locally administered servers.

Load Management Executive - NTMC module which runs electric utility load management algorithms. It is encapsulated in the LMEX program. It is integrated with (and depends on) the NTMC core services.

Load Point - Load management I/O point for control of relays on the power grid. Each load point is mapped to a NTMC core control point, and contains additional configuration parameters relevant to load management algorithms.

Meter - Meter reading module I/O point for importing demand data. Each meter is mapped to a NTMC core counter, and contains additional configuration parameters relevant to meter reading algorithms.

Metering Point - The minimum set of load points, and demand points that load management algorithms can manage together using the same set of policies. A metering point can be managed independently, or as a part of a larger system.

Meter Reading Executive - NTMC module which runs electric utility meter reading and demand recording algorithms. It is encapsulated in the MREX program. It is integrated with (and depends on) the NTMC core services.

MODBUS RTU - one of industry standard communication protocols supported by NTMC. Developed by Modicon, Inc., North Andover, MA.

Momentary Control Point - I/O point for controlling momentary relays. Abbreviation: MCP. A momentary relay can have one of two possible states: TRUE (1) or FALSE (0). The two possible states are usually assigned names such as SET vs. RESET, ACTIVATE vs. CANCEL, etc. Such a relay is placed to one of its states by an appropriate NTMC generated command. The relay stays in that state for a short (programmable) time, after which it resets to its other state. This reverse transition can also be generated before timeout by an appropriate NTMC command.

NTMC Core - The minimum set of programs required for the NTMC system to function. The core consists of MCEX (Master Controller Executive), IOEX (Input Output Executive), RUEX (Remote Unit Executive), MCSA (Master Controller Security Administrator), MCEV (Master Controller Event Viewer), MCED (Master Controller Configuration Editor), and TPGM (Evaluator Program Tester and Debugger).

NTMC Master Controller - A software suite for management of control systems. It consists of a core, which provides basic services (e.g. communications, hardware protocols, database management, configuration editing, event logging, system debugging, automatic remote unit polling, basic SCADA functions, etc.), and modules, which run application specific algorithms, such as load management, capacitor control, and automated meter reading.

NTMC Modules - NTMC Master Controller components which run application specific algorithms, and rely on the NTMC core for execution of basic services. The currently available modules are Load management, Meter Reading, Capacitor Control, Remote Client, and WebLink.

NTMCRDR - NTMC Resident Data Recording. Data recording performed by NTMC. The core can record any analog point or counter data. Modules can record data of their respective data inputs, as well as various totals. Data can be retrieved and analyzed at any time by using MCDA, an NTMC core component.

NTMC System - A control system running NTMC Master Controller software.

One-line Diagram - A user designed diagram representing the system monitored by NTMC. Such a diagram consists of simple, on-line drawings of system components such as cables, relays, transformers, capacitor banks, etc.

Operating System – NTMC runs on Microsoft’s Windows XP Professional, or Windows 2000. Windows NT, version 4.0, is still supported for backward compatibility.

Panel - A window graphically displaying the whole system, or one part of the system, monitored by NTMC. The diagram is made up of display elements.

Power Poll - Special kind data query where, in case of pulse counters, not only are their values returned, but also their respective rates of change. Implemented in support of the NeXGen product line of RTUs.

Primary Load Point - LMEX load point which is assigned a load rating, and is used by LMEX to connect / disconnect power users to / from the power grid. 

Remote Code Generator Board - A RTU resident board, capable of relaying  switch-bound control codes. Abbreviation: RCG Board.

Remote Unit - Abbreviation: RU. User configurable software component for managing a collection of NTMC core I/O points. A remote unit can be associated with a single I/O point (e.g. when controlling a single relay switch), or with a multiple I/O point interface device capable of communicating with NTMC (e.g. an RTU, a PLC, or a remotely located RUEX component of another NTMC system).

Route - A collection of route links used for relaying messages to route users. Each route must have one or more route links.

Route Link - a remote unit used for relaying messages to remote units too far to be reached by the master controller directly. Each route link must be a member of at least one route. It can be a member of more than one route.

Route User - A remote unit too remote, or otherwise directly inaccessible by the master controller. The latter communicates with the RU via a route. The RU itself is not a member of a route, i.e. it is not used for relaying messages.

Routing - Relaying of messages to their final destination. In the NeXGen product line of RTUs, routing is implemented as a message store & forward technology, on top of DNP 3.0 protocol, without violating any of the rules of the protocol.

RURDR - Remote Unit Resident Data Recording. Data recording performed by remote unit. Such data needs to be downloaded to the master periodically. Download period depends on how long remote units can collect data without running out of buffer space. Data can be retrieved and analyzed at any time by using MCDA, an NTMC core component.

SCADA - Supervisory Control And Data Acquisition.

Schedule - A collection of parameters shared by a group of load management loads. Each load point mapped to a schedule inherits attributes defined in that schedule. Also, a collection of parameters shared by a group of capacitor control module capacitors. Each capacitor mapped to a schedule inherits attributes in that schedule. Also, a collection of parameters shared by a group of meter reading module meters.

Secondary Load Point - LMEX load point which is assigned zero load rating, and is operated by LMEX only when the corresponding primary load point is operated.

Small System – an NTMC system is considered small when it contains only the core components, and is mapped to no more than 100 I/O points.

Status Point - I/O point for reading status points. Abbreviation: STP. A status point can be in one of two modes: Boolean, or multi-valued. In the first case the point can have one of two possible values: TRUE (1) or FALSE (0). The two possible values are usually assigned names such as ON vs. OFF, OPEN vs. CLOSED, etc. Some external agent, such as a relay opening or closing an electric circuit usually changes the point's value. In the multi-valued case up to sixteen possible discrete values are allowed, and each can be assigned a name. This functionality is for tracking and reporting multi-state situations. All labels are assigned from a previously prepared label database.

Strategy - a collection of LMEX schedules which define how load management is implemented.

Substation - a set of capacitors, feeders, and configuration parameters that capacitor control module algorithms can manage together using the same set of policies.

Timed Control Point - I/O point for controlling timed relays. Abbreviation: TCP. A timed relay can have one of two possible states: TRUE (1) or FALSE (0). The two possible states are usually assigned names such as ON vs. OFF, CLOSED vs. OPEN, etc. Such a relay is set to one of its states by NTMC. The relay stays in that state as long as NTMC keeps sending it 'refresh commands', after which the relay times out and switches to its other state.

Twin Load Point - LMEX secondary load point which is operated by LMEX as soon as the corresponding primary load point is operated.

VPN - Virtual Private Network - private computer network used to communicate confidentially over a public network, such as the internet.

Wide Area Network - Abbreviation: WAN. Computer network, usually consisting of a number interconnected LANs. WANs usually span larger geographical areas. Internet is a good example.

 

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