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Glossary
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Any of the Units in a Remote I/O System. Remote I/O Units include Masters,
Slaves, Optical I/O Units, I/O Link Units, Remote Terminals, and I/O Termi-
nals.
The time it takes for the PC to output a control signal after it has received an
input signal. The response time depends on factors such as the system con-
figuration and when the CPU receives the input signal relative to the start of
a scan.
The total time required for the PC to perform all of the operations involved in
executing the program in its memory. The duration of the scan time differs
depending on the configuration of the system, the number of I/O points, the
programming instructions used, and so on.
The pattern in which origin search is carried out. The particular search pat-
tern performed depends on the position of the origin with respect to the initial
position and the search direction (CW or CCW).
A control system in which a PC controls an external process without human
intervention. This system provides feedback (via a tachogenerator and a
rotary encoder) so that actual values (of positions, speeds, and so on) are
continuously adjusted to bring them more closely in line with target values.
An operation whereby a rotary encoder is used to maintain the position of a
motor while it is stopped. Whenever the motor axis moves, the rotary encod-
er sends a feedback pulse to an error counter, causing a rotation voltage to
be generated in the reverse direction so that the motor rotates back to its
original position.
A positioning action completion code that causes positioning to stop after the
target position has been reached.
A Backplane to which a Remote I/O Slave Unit is attached.
A dedicated Unit, such as a Position Control Unit, High-Speed Counter Unit,
or Analog Timer Unit, which is designed for a special purpose.
An IR area setting which determines the coefficient with regard to the target
speed.
A number used to designate (as a parameter for an operation) one of fifteen
speeds registered in memory.
A word in the DM area which can be set to multiply the speed to which it is
assigned by a factor of one or ten.
A parameter for a positioning action that designates what position is to be
reached at the completion of the action.
Writing the present position into the DM area of the PC as the target position
for the designated positioning action.
Accelerating and decelerating in a stepwise pattern such that a trapezoidal
figure is formed.
Remote I/O Units
response time
scan time
search pattern
semiclosed-loop system
servolock
single (completion)
Slave Rack
Special I/O Unit
speed coefficient
speed number
speed unit
target position
teaching
trapezoidal
acceleration/deceleration