System philosophy
HARDWARE REFERENCE MANUAL
44
Revision 5.0
Absolute SSI encoder ATYPE=48
With
SERVO = ON
, this is an axis with analogue speed reference output and
absolute SSI encoder feedback. The position loop is closed in the TJ2-MC__
and the resulting speed reference is sent to the axis.
With
SERVO = OFF
, the position of the external absolute SSI encoder is
read. The analogue output can be set with BASIC commands only and can
be used for general purposes.
MECHATROLINK Inverter axis ATYPE=49
fig. 35
This type allows Inverters (with built-in encoder interface) to be controlled on
the MECHATROLINK-II bus as servo axes.
From the controller point of view, Inverter axes are handled the same as
servo axes in MECHATROLINK-II Speed Mode (
ATYPE=41
).
Unlike the other axis types, this Inverter axis must be defined
programmatically with function 8 of the command
INVERTER_COMMAND
.
The Speed command to the Inverter and the feedback from the encoder is
refreshed in the Inverter every 5 ms. This is a DPRAM limitation. This means
that the use of the Inverter is similar to the use of a Servo Drive, but the
performance is lower.
INVERTER
+
_
M
E
TJ2-MC__
TJ1-ML__
Position loop
Demanded
position
Measured
position
Profile generator
Following
error
Speed
command
DPRAM
REFRESH
EVERY 5ms
ML-II
Speed
command
Speed Loop
SERVO = OFF
SERVO = OFF