GLOSSARY - TM-5-6350-275-24-P0526

TM 5-6350-275-24&P

GLOSSARY

TERM

EXPLANATION

Passback Violation

The attempted misuse of the access control subsystem by "passing back" a

card from an authorized holder, so that it can be used to gain access by an

unauthorized person. The system maintains a check against passback

violation by ensuring that cards are not presented at the same reader within

a very short time and/or that the record of zones entered by holders does

not contain inconsistencies.

Password

A word or sequence of characters entered into the Password field of the

SignOn form which is not displayed for security reasons. The password

ensures that only authorized personnel are able to access a particular

program.

Personal Identification Number. If a PIN is included on the holder record, it

must be keyed in whenever the holder presents an access card to a reader

unit, thus providing additional protection against system violation.

Plant

An item of equipment being controlled and/or monitored by a remote station.

Point

A general term describing an element in the system for which a value or

state is to be calculated or acquired. There are two point types (pseudo and

real) which can be used to store one of three data classes: status, analog,

or pulse accumulation.

Point Failure

The condition where a remote station has failed (or is unable) to return

readings from one or more points in response to a poll. A point failure

usually implies that a board in the remote station, used to interface the

equipment being monitored and/or controlled, has failed.

Point Summary

A display containing a list of points and their current value and/or status.

Poke

The operation of moving the cursor into the display frame in order to select

or identify information from a current display.

Pokeable Display

A primary display into which the cursor can be placed in order to identify a

station or point, or simply create a further (related) display.

Poll

A request by a master station for a remote station to return data relating to

the equipment being monitored. There are two poll types: upset poll and

data poll.

Poll for Data

A request by a poller asking a remote station to return data relating to all of

its associated points. When the data is received, it is put in the system

database. The poll is designed to ensure that the database always gives a

true reflection of the equipment being monitored. It is of particular

importance when a remote station has been powered down for maintenance

purposes. It also serves to test the communications bearer(s), since the

remote station concerned is expected to reply. Due to the amount of data

that can be returned by a remote station, this poll takes longer to complete

than a poll for upsets.

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