4-26 Daughter Boards
SSI Servo Encoder Daughter Board
Trio Motion Technology
SSI Servo Encoder Daughter Board
Trio Product Code P270
Description:
ATYPE
parameter for Absolute Servo (SSI) Daughter Board = 7
The SSI daughter board provides the interface to a DC or Brushless servo motor
fitted with an absolute SSI Gray Code encoder or encoder emulation. The
encoder port provides high speed differential synchronous serial interface
(SSI). This port is opto-isolated to maximise the noise immunity of the system.
The SSI port is programmable so that any number of bits from 1 to 24 can be
clocked into the position registers.
If the registration function is to be used then a minimum of 12 bits is required
for correct operation.
The SSI daughter board provides a hardware position capture function for both
a 5V differential input and a dedicated 24volt registration input. Transitions of
either polarity on both these inputs can be used to record the position of the
axis at the time of the event within less than 1 micro seconds. This practically
eliminates time delays and avoids interrupting the processor frequently in
multi-axis systems. It should be noted however that the SSI system overall
does not support this level of accuracy due to delays in clocking data from the
encoders.
The servo daughter board provides a 12 bit +/-10v voltage output to drive
most servo-amplifiers. The voltage output is opto-isolated as standard to max-
imise the noise immunity of the system.
Connections:
SSI Connections:
The SSI encoder is connected via a 9 pin 'D' type socket mounted on the front
panel. The socket supplied should be cable mounted and wired as shown
below. The SSI encoder port is designed for use with differential output 5 volt
encoders.
VV+-
R0v
ENCODER
21345
98 76
To Next Page
Loading...
Need help?
General
