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0$&+ ,1(&21752 //(5 1(;7029( &$5' Chapter Issue 4 May 03 Technical Reference Manual 6.11 Digit al Outputs The twelve di gital out put s are opto-i solated open co llector t ype arranged as a bank of ei…
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6.10 Technical Reference Manual Chapter Issue 4 May 03
Analog to Digital
Converter
Analog inputs are fed to MAX 180 devices, an eight channel, twelve bit
multiplexed analog to digital converter. The NextMove card is capable of
operating with either a bipolar input voltage or a unipolar input voltage and
selection of this feature is made under software control.
Figure 6-5 Sample ADC Circuit
Digital Inputs The digital inputs are selected as opto-isolated NPN circuits. The signal must
be present for a minimum of 1ms (one software scan) for the input to be
accepted by the application program.
An example of a digital input is shown below:
Figure 6-6 Digital Input Sample
Sensor
+V
-V
NextMove
Breakout
NextMove Card
Digital
Out
Analog In
Differential
Amplifier
-Signal In
+Signal In
Out
MAX 180
ADC
Hall Effect (Home) Switch
NextMove Digital Input
V+ (User)
Opto-Isolator
2K
0V
12V
12V
0V
0V
Signal
V+
Control
Circuit
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Chapter Issue 4 May 03 Technical Reference Manual 6.11
Digital Outputs The twelve digital outputs are opto-isolated open collector type arranged as a
bank of eight and a bank of four. The bank of eight are NPN Darlington pairs,
the bank of four are FET’s which supply the servo enable control of the servo
drive cards and the stepper MUX control signals.
An example of a servo enable control digital output is shown below:
Figure 6-7 Digital Output Sample
Enable In
LED
Link
Z
Enable Out
LED
NextMove Card
FET
*
**
**
User Gnd
For the bank of 8, an NPN Darlington Pair is used instead
of an FET.
For the bank of 8, Link Z is replaced with Link X, which is
not fitted enabling the voltage at the collector to be
different than 12V.
*
ENABLE
IC
Load
Servo Drive
Encoder
NextMove
Dig O/P
(FET)
Dig I/P
Servo 0
Input
Servo 0 Demand +VE
44V
AC2
44V
AC1
+VE
-VE
Servo 0 Enable
Servo 0 Error
Servo 0 Demand -VE
M
Demand
+10V
-10V
ZYXW
1
U37
Com
Part of NextMove Card
ULN 2803
FET
Daughterboard
U38
User V+
12V
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6.12 Technical Reference Manual Chapter Issue 4 May 03
Servo Loop
(Analog Outputs)
The servo motor demands are ±10V outputs buffered by operational amplifiers
which are not opto-isolated. The voltage outputs are arranged in four groups.
These are routed to their respective servo drive cards to drive individual motors.
An example of the servo loop connection is shown below:
Figure 6-8 Typical Servo Loop Connection
Servo Drive
Encoder
NextMove
Dig O/P
(FET)
Dig I/P
Servo 0
Input
Servo 0 Demand +VE
44V
AC2
44V
AC1
+VE
-VE
Servo 0 Enable
Servo 0 Error
Servo 0 Demand -VE
M
Demand
+10V
-10V
Servo Loop Block Diagram