Mitsubishi A1SD75M1, User Manual

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MELSEC-A
1 PRODUCT OUTLINE
1.1.3 Mechanism of positioning control
Positioning control using the AD75 is carried out with "SSCNET". In the positioning
system using the AD75, various software and devices are used for the following roles.
The AD75 realizes complicated positioning control when it reads in various signals,
parameters and data and is controlled with the PLC CPU.
This section explains positioning control as performed by pulse train output for ease of
understanding. (Because of the SSCNET connection type, the AD75 outputs to the
servo amplifier the data (position/speed commands) resultant from conversion of pulse
trains into numerical values.)
In numerical data-based commands and pulse train-based commands, the concepts of
the movement amount and speed are the same.
Creates control order and
conditions as a sequence
program.
Stores the created program.
The AD75 outputs the start signal and
stop signal following the stored program.
AD75 errors, etc., are detected.
GPP function
software
package
PLC CPU
Inputs signals such as the start
signal, stop signal, limit signal and
control changeover signal to the AD75.
AD75
software
package
AD75 positioning
module
External signal
Manual pulse
generator
Issues commands by
outputting pulses.
Sets the parameters and
positioning data for control.
Outputs the start command for
JOG operation, etc., during test
operation with the test mode.
Monitors the positioning operation.
Servo
amplifier
Receives commands from AD75, and drives
the servomotor.
Outputs the monitor data that indicates the
servo amplifier status.
Servomotor
Workpiece
Carries out the actual work according to commands
from the servo amplifier.
Stores the parameter and data.
Outputs position/speed command to the servo according
to the instructions from the PLC CPU, AD75 softwar
package, external signals and manual pulse generator.