Motorola DH6200 Specifications download pdf (Page 127)

2-115Master Glossary of Terms and Symbols

TR4.0:PROVOXRevision A — April 1997

supervisory (SUP or SUPV)

A loop control mode: the control

algorithm changes the control output to

minimize the difference between the

values of the setpoint and the process

variable. A process computer, a computer

program, a unit point, or a logic control

point supplies the setpoint value.

supervisory p rocess con t rol system

A computer process monitoring a control

system that often sits on top of a

distributed control system (DCS). A

supervisory process control system is

often not redundant, and is suitable for

supervisory control on the order of once a

minute, not for direct or fast control of

continuous values.

SV

Acronym: Secondary Variable

SVA

Acronym: Signal Value Analog

SVD

Acronym: Signal Value Discrete

SVP

Acronym: Signal Value Percent

SVXFR

Acronym: Service Transfer

SW

Abbreviation: Switch, or Software

switch (SW)

See DIP Switch.

switchover

The active controller becomes inactive

and the standby controller becomes

active.

synchronous data link

communication (SDLC)

A protocol for communications between

synchronized devices. The protocol

features bit-level message frames with

error checking.

synchronous serial data adapter

(SSDA)

1. An integrated circuit device that

provides a bidirectional serial interface for

synchronous data exchange. This device

contains interface logic for

simultaneously sending and receiving

standard synchronous communications

characters.

2. In PROVOXr, an integrated circuit

(Motorola 6852) that provides

communication between a regulatory

controller and an operator station. When

an operator plugs a hand-held tuner into

the operator station, the SSDA also is the

interface to the turner.

synchronous serial transmission

In synchronous serial transmission, a

timing signal or clock pulse is transmitted

on a separate communication line, or

embedded in the data stream so the

signal or pulse can be extracted by the

receiving device.

HART protocol does not use

synchronous transmission.

See Asynchronous Transmission.

system administrator

A person who has useful knowledge

about the database management system

and the operating system of the client.

This person will ensure the database is

backed up regularly, set up system

security, and check to ensure the IIS

software is working correctly. To carry out

the tasks described above, the system

administrator has access to look at and

change everything on the system.

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