
System philosophy
HARDWARE REFERENCE MANUAL
14
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on 3.0
2
System philosophy
2.1
Introduction
fig. 1
The system philosophy is centred around the relationship between:
•
System architecture
•
Cycle time
•
Program control and multi-tasking
•
Motion sequence and axes
•
Motion buffers
A clear understanding of the relationship between these concepts
is necessary to obtain the best results for the Trajexia system.
2.1.1
Glossary
Motion sequence
The Motion Sequence is responsible for controlling the position of
the axes.
Servo period
Defines the frequency at which the Motion Sequence is executed.
The servo period must be set according to the configuration of the
physical axes. The available settings are 0.5ms, 1ms or 2ms.
Cycle time
Is the time needed to execute one complete cycle of operations in
the TJ1-MC__. The cycle time is divided in 4 time slices of equal
time length, called "CPU Tasks". The cycle time is 1ms if
SERVO_PERIOD 0.5ms or 1ms and 2ms if the
SERVO_PERIOD=2ms.
AXIS TYPE
AXIS TYPE
AXIS CONTROL LOOP
Position
Loop
Position
Loop
Buffer &
profile
gererator
Buffer &
profile
generator
Servo drive.
MOTOR
Position
Loop
Position Loop
Speed Loop
Speed Loop
Torque
Loop
Torque Loop
Servo drive.
MOTOR
ENC
Speed Loop
Torque Loop
Via
ENC
Program Buffer
BASIC PROGRAMS
Process 1
Process 2
Process 3
…
Process 14
Comms
TJ1-MC16
AXIS TYPE
TJ1-ML16
TJ1 FL02
-
Ethernet
FINS
Ethernet
TJ1-PRT
MC I/O
Profibus
BUILT-IN
TJ1-ML16
All other
Servo
drives
I51E-EN-03.book Seite 14 Donnerstag, 28. Juni 2007 1:05 13