NextMove BX Installation Manual for Mint™ v4
20
MN1258V4 08/2000
NextMove BX uses a Data Acquisition Chip (Maxim MAX180). This device has:
•
12 bit resolution with ½ LSB linearity
•
Built in track and hold
•
A 2us sample window.
The chip can operate with either bipolar or unipolar input voltages, the selection of which is made
under software control.
Input buffers with an impedance of 20k and clamping diodes protect the device from voltage
extremes, and analog switches allow true differential measurement. The voltage range of the inputs
when used in single-ended mode is
±
2.5V (bipolar) or 0-5V (unipolar), and when used in differential
mode is
±
10V (bipolar only).
The input buffers do not have any filtering. Therefore any noise on the inputs will be reflected in the
value read.
When analog channel 0 (2, 4, 6) is switched to differential mode, channel 1(3, 5, 7) is switched to
feed back of analog output 0 (1, 2, 3).
Associated MINT keywords are:
ADCMODE, ADC
3.5.2
Analog Outputs (Drive Command: J7)
The controller provides up to four ±10V (±0.1%) analog outputs for motor
command
– one for each
servo axis. A 14 bit DAC is used which gives a resolution of 1.2mV/bit. The optimum cabling
arrangement is to use a separate shielded twisted pair cable, twist
with
command-
and
connect the screen/shield to screen/shield at the controller end only.
Pin No
Signal
Function
1
demand 0
Demand/Command output for axis 0
2
agnd
Analog ground
3
demand 1
Demand/Command output for axis 1
4
agnd
Analog ground
5
demand 2
Demand/Command output for axis 2
6
agnd
Analog ground
7
demand 3
Demand/Command output for axis 3
8
agnd
Analog ground
9
agnd
Analog ground
10
chassis
Chassis ground for cable screen
Analog ground (
agnd
) is at the same potential as digital ground (
gnd
). They are connected at the
DAC chip.
There are four 14 bit resolution analog outputs implemented in an MP7611. The outputs have a
range of
±
10V, and revert to 0V during system reset. The outputs are referred to the system ground
(not opto-isolated) via a separate but connected analog ground plane.
Summary of Contents for NextMove BX
Page 1: ...MN1258V4 08 2000 NextMove BX Installation Manual for Mint v4 Issue 4 0...
Page 2: ...NextMove BX Installation Manual for Mint v4 ii MN1258V4 08 2000...
Page 4: ...NextMove BX Installation Manual for Mint v4 iv MN1258V4 08 2000...
Page 8: ...NextMove BX Installation Manual for Mint v4 viii MN1258V4 08 2000...
Page 12: ...NextMove BX Installation Manual for Mint v4 xii MN1258V4 08 2000...
Page 18: ...NextMove BX Installation Manual for Mint v4 6 MN1258V4 08 2000...
Page 22: ...NextMove BX Installation Manual for Mint v4 10 MN1258V4 08 2000 Figure 3 3 Board Settings...
Page 46: ...NextMove BX Installation Manual for Mint v4 34 MN1258V4 08 2000...
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