Motion Coordinator Technical Reference Manual
Daughter Boards 4-27
SSI Servo Encoder Daughter Board
The SSI encoder may be powered from the +5V supply output on the daughter
board, provided it requires less than 150mA supply current. If the encoder is situ-
ated so far from the module that the supply is inadequate an external supply
should be used and regulated locally to the encoder. In this case the +5V connec-
tion from pin 8 should not be used and the external supply 0v should be con-
nected to pin 5 (0V).
Voltage Output
The +/-10v output voltage to drive external servo amplifiers is generated
between the V+ and V- pins. The voltage output is isolated and floating but if
multiple servo daughter boards are fitted it should be noted that the boards
share a common power supply for generation of the +/-10v. This means that the
V- pins should not be referenced to different external voltages.
Registration Input
The registration input is a 24v dc input connected through high-speed opto-isola-
tion into the encoder counter circuit. An alternative 5v input pin is available on
the encoder port. The internal circuitry can be used to capture the position at
which the registration input makes a transition from low to high or vice-versa.
This function is accessed in software from the
REGIST
command. The input is
measured relative to the 0v input on the servo daughter board which must be
connected if the registration input is used. Note that this is the same 0v as the
encoder port. Note: the Z pulse input normally used with incremental encoders is
still available for use as a general purpose differential 5V regist input.
5 4 3 2 1
9 8 7 6
Pin. function
1
data true
2
data complement
3
clock true
4
clock complement
5
0V- must be connected even if an external PSU is used to power the
encoder.
6
marker (Z) true - can be used as a second general purpose regist input.
7
marker (Z) complement - can be used as a second general purpose reg-
ist input.
8
+5V (150 mA max) - This output is short circuit protected
9
Registration Input 5v Input pin
shell
protective ground
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