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LOSC > IC-DCS > Flashcards

IC-DCS Flashcards

1
Q

State the purpose of DCS

A 
Provides a means of:
Receiving data from the field
Interpreting that data
Applying algorithms to that data
Provides digital outputs to display and/or control plant parameters
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2
Q

DCS Definitions

Algorithm:

A

:

A set of rules, procedures, and mathematical formulas that define a desired control strat

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3
Q

DCS Definitions Analog

A

Conditions/values that vary across some range
A point that is associated with I/O hardware that converts a field signal (voltage) to a signal that can be used by the processor.

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4
Q

DCS Definitions Arbitrator

A

An alternate signal used to determine which is the valid input signal for an algorithm with one input failed

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5
Q

Drawing that represents the control scheme (DCS)

A

Control builder sheet

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6
Q

A drop used to control a process (DCS)

A

Controller

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7
Q

Distributed Control System (Ovation)

A

DCS

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8
Q

A range of values that an input signal can vary without initiation of an action that changes the output signal

A

Deadband

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9
Q

Signals or conditions that are either on or off

A

Digital

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10
Q

A term for a network end point (controller, workstation, server) in the ovation network

A

Drop

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11
Q

EWS

A

Engineering work station

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12
Q

A drop that collects and stores process data and other information
Also called Historical Storage and Retrieval drop (HSR)

A

Historian

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13
Q

Individual hard-wired circuits connecting field devices with the processor

A

I/O

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14
Q

Manual/Automatic station

Can be a hard controller on the MCB or a diagram in Ovation (‘soft’)

A

M/A Station

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15
Q

A drop that is used to control and monitor plant operation

A

Operator Work Station (OWS)

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16
Q

Processes diagrams

A

Graphical images that represent actual plant processes control equipment

17
Q

Indicates point condition to the operator station and to the algorithms

A

Quality

18
Q

The desired value of a variable

A

Setpoint

19
Q

Small Loop Interface Module
Wired to a control loop
Can be used along with soft controls and will continue to function in the even that the soft controls fail

A

SLIMs

20
Q

Used to connect multiple Ovation stations together

A

Switch

21
Q

Display that plots process variables over time

A

Trend

22
Q

DCS Hardware

A

Know that the SLIMs connect directly to the I/O devices downstream of the controllers. If the controllers fail, the SLIMs will still be able to directly control the process variables. Soft controls will no longer work

23
Q

DCS Component function

A

Controller
Redundant controllers in each control cabinet execute the control functions to operate the system.
One controller operates in control while the other is in standby mode. Both controllers maintain constant communication so if one fails, the other will seamlessly take control of the system.
I/O
Interface field signals from plant processes to the controller.
Interface directly to the SLIMs
Electronics Modules
Contains the two circuit boards (logic and field) that facilitate communication
Personality Modules
Part of I/O that configures the Electronics Modules
Ovation Network Switches
Hardware that connects network drops
DCS HMI
Human interface stations (control room computers)
OWS/EWS
OWS is the operator work station and contains all the DCS graphics, trends, etc
EWS provides the tools for making engineering changes to the system such as adding or deleting database points, modifying graphics or controls

24
Q

SLIMs

A

Provide the operator with a control panel mounted panel
In each SLIM are redundant controllers should one fail
SLIMs still function even with the loss of its associated controller
When a component is in Auto or Manual on the Soft control or the SLIM a change is mirrored on both component’s (ie in Manual opening a valve is shown on the SLIM as well as soft control)
Placing a SLIM in ‘L’ Manual locks out the soft controls so that only the SLIM can control the parameter

25
Q

Graphic Display

A

Provide all the functionality of a SLIM on the computer (no Local button)

26
Q

DCS Signal Processing

A

Median Signal Selector
Uses 3 inputs and selects the middle output
If one of the three inputs fail, the average of the remaining two inputs is used as the output
Median Select 2nd highest selector
4 inputs going into 4 Median Selectors (3 inputs each) which each spit out the four median or average (if one value has failed) outputs. These outputs are fed into a High
select box which provides the highest of the 4 inputs. This output is the 2nd highest of the 4 original inputs
Two Channels with Arbitrator
Takes the average of two inputs while comparing the inputs to another variable (arbitrator).
If one of the inputs fails, it is kicked out after being compared to the arbitrator.

LOSC (7 decks)

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