NOVA electronics Inc. MCX514 -
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3.9.2 External Signal Controlled Single-step Interpolation
EXPLSN pin (30) is used for the single-step interpolation from the external signal.
Normally, EXPLSN input signal is on the Hi level. When it changes to Low, the interpolation step will be output.
The operating procedure is shown as follows.
a.
Set D9 bit to 1by interpolation mode setting command (2Ah).
It will enable the single-step interpolation.
b.
Set the same value to the initial and drive speeds of interpolation main axis.
When the same value is set to the initial and drive speeds, driving becomes constant speed. This speed value must be faster than
the Low pulse cycle of EXPLSN as well as the case of the command.
c.
Set interpolation data. (finish point, center point…)
d.
Write interpolation command.
Although the interpolation segment was written, the interpolation pulses are not output yet, because the single-step interpolation
is enabled.
e.
EXPLSN input on Low level
The interpolation pulse will be output after 2~5 CLK from the EXPLSN falling down.
The Low level pulse width of EXPLSN has to be longer than 4CLK. Furthermore, the pulse cycle of EXPLSN has to be longer
than the setting speed cycle of the main axis.
The Low level pulse of EXPLSN is repeated until the interpolation driving is finished.
If the user wants to stop single-step interpolation on the way, write instant stop command (57h) to the main axis and wait for more
than 1 pulse cycle, and then input the Low level pulse of EXPLSN again, driving will stop. (Or the user can software reset.)
The Low level pulse of EXPLSN input after the termination of interpolation driving will be disabled.
3.9.3 Attention for Single-step Interpolation
•
ESPLSN signal does not have the filter function. When generating Low pulses of EXPLSN at a mechanical contact
point, prevent the malfunction caused by chattering.
•
In single-step interpolation, short axis pulse equalization mode cannot be used.