Rockwell Automation SMC Dialog Plus User Manual page 183

Port
Power Factor
Preset Speed
Programmable Controller
Protocol
Remote I/O
RS-232-C
RS-422
RS-485
Scrolling
Serial
Service Factor (S-F)
Silicon Controlled Rectifier
SLC™ Controller
On a communication link, the logic circuitry or software at a station that determines
its communication parameters for a particular communication channel.
A measurement of the time phase difference between the voltage and current in an
AC circuit. It is represented by the cosine of the angle of this phase difference.
Power factor is the ratio of Real Power (kW) to total kVA or the ratio of actual
power (W) to apparent power (volt-amperes).
Preset speed refers to one or more fixed speeds at which the drive will operate.
A solid-state system that has a user-programmable memory for storage of instruc-
tions to implement specific functions such as I/O control, logic, timing, counting,
report generation, communication, arithmetic, and data file manipulation. A con-
troller consists of a central processor, input/output interface, and memory. A con-
troller is designed as an industrial control system.
A set of conventions governing the format and timing of data between communi-
cation devices.
I/O connected to a processor across a serial link. With a serial link, remote I/O can
be located long distances from the processor.
An EIA standard that specifies electrical, mechanical, and functional characteris-
tics for serial binary communication circuits in a point-to-point link.
An EIA standard that specifies electrical characteristics of balanced-voltage digital
interface circuits in a point-to-point link.
An EIA standard that specifies electrical characteristics of balanced-voltage digital
interface circuits in a multi-point link.
The vertical movement of data on a display screen caused by the dropping of one
line of displayed data for each new line added at the opposite end.
Pertaining to time-sequential transmission of, storage of, or logic operations on da-
ta, using the same facilities for successive parts.
When used on a motor nameplate, a number which indicates how much above the
nameplate rating a motor can be loaded without causing serious degradation (i.e.,
a motor with 1.15 S-F can produce 15% greater torque than one with 1.0 S-F) to
adjust measured loads in an attempt to compensate for conditions which are diffi-
cult to measure or define.
A solid-state switch, sometimes referred to as a thyristor. The SCR has an anode,
(SCR) cathode and control element called the gate. The device provides controlled
rectification since it can be turned on at will. The SCR can rapidly switch large cur-
rents at high voltages. They are small in size and low in weight.
An Allen-Bradley programmable controller with a name that includes the letters
SLC. See Programmable Controller.
Glossary-3