Technical data

12/2006 – Subject to change – Multi-Axis Controllers and ServoWire
®
Digital Drives
41
Glossary
Engineering Support
4
O
OPC
OLE for Process Control. A set of
open standards for connectivity
and interoperability of industrial
automation and enterprise
systems.
P
Pacer encoder
An incremental encoder or
device that generates quadrature
signals which are used by other
servo axes when they operate as
followers.
PLCopen
Association of manufacturers
and users of programming logic
controllers and programming
systems to promote the
IEC 1131-3 standard (PLC
programming) and certify
programming systems based
on it. This includes the definition
of various compliance levels as
well as the development of test
procedures and the award of
certificates by independent
institutions. The programming
language IEC 61131-3 is also
substantially supported.
Q
Quadrature
Quadrature or "phase
quadrature" signals are the
most commonly used method
of electronically determining
or transmitting bidirectional
position information.
The two-quadrature signals
are digital square waves, which
have their cycles displaced
90 degrees (of the 360 electrical
degrees in the repeated
waveform). All four edges of
the two digital signals are
normally used for the maximum
possible position resolution
("4X").
R
RTOS
Real-Time Operating System.
Regeneration
Usually refers to a circuit in
a drive amplifier that accepts
and drains energy produced
by a rotating motor either during
deceleration or free-wheel
shutdown. In some systems,
this regen power can be used
by other axis.
Registration control
The act of maintaining a fixed
position relationship between
machine tooling and a product
in the machine. Registration is
normally measured by capturing
the tooling position with
respect to the product using a
registration sensor of some type.
It is controlled by phasing the
tooling ahead or behind based
on the difference between the
actual and desired positional
orientation.
Resolver
A position transducer used to
determine the position of a
motor. Resolvers are rotary
transformer devices with
analog interfaces. However,
in Festo motion control
systems which use resolvers,
the servodrive decodes the
resolver position digitally.
S
S curve
S curve refers to a control pattern
that accelerates and decelerates
a motor slowly to reduce
mechanical shock.
Servo motor
A motor which is used in closed
loop systems where feedback is
used to control motor velocity,
position, or torque.
Servo drive
A motor drive which utilizes
internal feedback loops for
accurate control of motor
current and/or velocity. It is
the electronics which convert
low level command signals to
high power voltages and currents
to operate a servomotor.
Slave axis
A motion axis that is derived and
driven by synchronization with
the master axis.
Synchronization
The condition that occurs
when several axes follow a
common control signal and
are in a specific position or
at a specific speed according
to the signal.
T
TCP/IP
Transmission Control Protocol
over Internet Protocol. The
de facto standard Ethernet
protocol.
Tension control
Using Tension feedback to
control the velocity of a
servomotor.
Tuning
In a servo system, the process
of optimizing loop parameters
to achieve the desired response
from a stage or mechanism from
an input command.