Specifications

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1.1.3 Mechanism of positioning control
Positioning control using the QD75 is carried out with "pulse signals". (The QD75 is a
pulse-generating module.)
In the positioning system using the QD75, software packages for the QD75 and the
GPP functions and external devices are used as shown in the diagram below.
Controlled by a PLC CPU, the QD75 realizes complicated positioning control, by
reading in various signals, parameters and positioning data.
GPP function
S/W package
QD75
positioning
module
PLC
CPU
S/W package
for QD75
External signal
Manual pulse
generator
Servo
amplifier
Motor
Workpiece
Creates control sequences
and conditions as
a sequence program.
Outputs the start and stop signals
according to the stored program.
Detects errors occurred in the QD75.
Sets parameters and
positioning data for control.
Outputs the start command for
JOG operation, etc., during test
operation in the test mode.
Monitors positioning operations.
Inputs signals such as the start
signal,stop signal, limit signal and
control switch signal to the QD75.
Transmits pulses.
Stores parameters and positioning data.
Outputs pulses to the servo amplifier.
Receives pulse commands from QD75,
and drives the motor.
Outputs the drive unit READY signal and
zero signal to the QD75.
Performs the actual operations according to
commands from the servo.