CENTENT MOTION CONTROLLER
CONTROL CONNECTOR:
The machine control functions are channeled through a D25 plug
connector labeled "CONTROL". This connector contains all inputs and
outputs. The power supply also passes through this connector. There are
eight digital TTL compatible outputs, eight digital TTL compatible inputs
and four analog inputs. The analog inputs are converted to 8-bit precision.
Two of each group of input/outputs are reserved for user defined
functions; the remaining have dedicated functions.
The input/outputs within each group are electrically identical. The digital
inputs are sampled 256 times a second, the digital outputs are updated
256 times a second and the analog inputs are sampled 32 times a second.
OUTPUTS:
The outputs are TTL and 5 Volt CMOS compatible, with a status indicator
LED for each output. The outputs are active low, with the status indicators
lighted in the low or logical '0' state. The labeled function on the cover next
to each indicator is active while that indicator is lit. Where the label is dual
function, the first function is active while the indicator is illuminated. The
second function is active when the indicator is off.
The circuit for a typical output is
shown in Figure 11
.
The output
driver is a 74LS374 octal D-flop.
The D inputs connect to the
CN0170 data buss while the Q
outputs go to the control connector.
The 2.2K resistor pulls the outputs
up to the 5 volt supply during a
logical '1' output. This enhances 5
Volt CMOS compatibility.
Figure 11, digital outputs
The 220 ohm resistor limits the status indicator LED current to 12
milliamps during the logical '0' or output active state. The 74LS374 has a
minimum logical '0' current sink capability of 24 milliamps, leaving 12
milliamps of driving capability.
STB X, Y: (pin 18, pin19
)
The STB output goes active (low) when the motor completes a positioning
move. This output, when used in conjunction with the BSY input, is a used
to synchronize an external process to the CN0170 motion controller. The
STB output may be used to trigger or initiate an external process that has
to be performed once the motor has completed a move. The external
process provides the BSY input to the CN0170. While the external process
is in progress, the BSY input is held active (low). When the process has
completed the BSY input to the CN0170 goes inactive (high). If another
move is pending, it may now begin.
An example would be a printed circuit board drilling application. The
CN0170 would operate an X/Y table that would carry the printed circuit
9
Содержание CN0170
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