Glossary of Terms

Glossary of Terms

Alarm Summary: A display panel that depicts an operational group’s process alarms in a hierarchical manner.

Analog I/O: Flow, pressure, level and temperature indicators read or set by the process control system.

Client/Server: Communications strategy whereby one device (server) provides information for a multitude of other devices (clients).

Control Function: Regulatory, discrete, or sequential, logic that is executed once or is executing continuously, such as, control of utilities, multi-point alarm monitoring and interlocks.

Control Group: A display panel that depicts the status of a group of instrument faceplates.

Control Loops: Process inputs signals, such as flow, pressure, level or temperature that are compared with a desired state in order to produce an output signal.

CPU: Central Processing Unit.

DCS: Distributed Control System.

Devices: Diverter valves, header valves, blowers, motors, pumps, etc. that use combinations of discrete I/O to perform a coordinated function. (Also referred to as Discrete Control Devices).

Discrete I/O: Input/Output of contacts that have binary characteristics.

Display Panel: Display on a CRT such as an overview, control group, graphic, trend, etc.

Faceplate: A representation of a function block and its parameters.

FAT: Factory Acceptance Test – This is a test that exercises all aspects of the Application Software provided as per the SRS.

FCS: Field Control Station – provide control and interlock functionality for the Yokogawa DCS

FHT: Factory Hardware Test A functional test of the process control system that ensures proper operation at the completion of the system assembly process.

FTP: File Transfer Protocol that allows file transfer between computers that operate on TCP.

Function Block: A control entity that performs a combination of input processing, control processing, output processing, and/or alarm processing as required.

Graphic panel: Custom pictorial display of the process or recipe data.

I/O: Input/Output – hardware for reading/writing field signals.

IS: Intrinsically Safe – low power specification used for hazardous areas in order to minimize explosion possibilities due to electrical signals.

Modbus: Transmission protocol operating on a master/slave principle for the communication of data.

MV: Manipulated Value.

Operator Guide Panel: A display panel that depicts a summary of operator guide and dialogue messages.

Overview: A display panel consisting of 32 display blocks designed to monitor overall operation and to access panels that are more detailed.

P&ID: Piping (or Process) and Instrument (ation) Diagram (Drawing).

Peer-to-Peer: Communications strategy whereby all devices have equal opportunity to send and receive requests to other devices.

PLC: Programmable Logic Controller.

PQP: Project Quality Plan – A document that defines the quality assurance activities and tasks necessary for the project.

PV: Process Value.

RL-Bus: Proprietary communication highway linking OPSs and FCUs via coaxial cable

RS-232C: A low speed serial data communications protocol.

RS-422: A unipolarity differential data communications protocol.

RS-485: A data communications protocol similar to

RS-422: with added capability of supporting many drivers and receivers on a single line.

SAT: Site Acceptance Test. A test to verify the actual operation of the process at the site.

Screen: A single display monitor.

Sequence Table: A truth table that evaluates a set of conditions, evaluates whether they are either true or false, and then provides a set of actions. Sequence tables can be used for either phase logic, interlocks, or sequential processing.

SRS: System Requirements Specification – a document that defines how the functional requirements will be accomplished within a specific hardware and software environment. The SRS, together with P&ID’s and instrument index, becomes the basis for system implementation.

Station: A single device on the control highway, such as an operator station or field controller.

Tag: An entity corresponding to a function block, such as a PID control function block. Data is always acquired or set by designating tags.

Trend Panel: A time-base graphical representation of up to eight tags with a single parameter value.

Tuning (Detail) Panel: A display panel that depicts a specific function block’s parameter’s, associated instrument faceplate and tuning trend.

UPS: Uninterruptible Power Supply. Provides Power conditioning and backup power to System components.

VL-net: Communication bus of CS3000. VL-net can function as either single or dual redundant bus.

Vnet/IP: 1GB Communication bus of CS3000 and CentumVP. Dual redundant bus.

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