System philosophy
HARDWARE REFERENCE MANUAL
27
Revision 5.0
2.5.1
Servo period
The
SERVO_PERIOD
can be set at 0.25, 0.5, 1 or 2ms. The processes that
take place within the cycle time depend on the setting of the
SERVO_PERIOD
parameter. The
SERVO_PERIOD
parameter is a Trajexia
parameter that must be set according to the system configuration.
The factory setting is 1ms (
SERVO_PERIOD=1000
). A change is set only
after a restart of the TJ2-MC__.
Servo period rules MECHATROLINK-II
The number of axes and MECHATROLINK-II devices in the Trajexia system
determines the value of the
SERVO_PERIOD
system parameter.
There are 3 types of MECHATROLINK-II devices that are supported by the
TJ2-MC__ units:
•
Servo Drives
The TJ2-MC__ considers Servo Drives as axes.
•
Inverters
By default, Inverters are not considered as axes, although this can be
changed by command.
•
I/O units and slice bus couplers
The TJ2-MC__ does not consider I/O units (analog and digital, counter
and pulse) and SmartSlice bus couplers as axes.
You must obey the most restrictive rules when you set the
SERVO_PERIOD
parameter. An incorrect value of the
SERVO_PERIOD
parameter results in
an incorrect detection of the MECHATROLINK-II devices.
Note
The Motion sequence execution depends on setting of the
SERVO_PERIOD
parameter.
Note
With MECHATROLINK-II only Sigma-V Servo Drive support the
0.5 ms transmission cycle.