Advantech PCI-1240, Руководство пользователя

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23 Chapter 3
The response time of this circuit should take about 0.2 ~ 0.4 msec
because of the delay of photo coupled and RC filter. The following figure
3-8 is an example of photo sensor used in the case of over traveling limit
switch input. When writing D3 bit of register2 (XWR2) into 0 to set the
limit switch is low active in X-axis, the following figure can work
normally.
Figure 3.8: Example of photo sensor used in the limit input signal
3.6 Deceleration/Instantaneous Stop Switch Input
(nIN1 ~ 3)
There are three input signals (nIN1, nIN2, nIN3) can make the motor
drives deceleration or stop. Each axis has four inputs IN3 ~ IN0, wherein
IN0 is used in phase Z interface of encoder feedback, and nIN1, nIN2,
and nIN3 are use as input signals near the original point. If run mode is
active, the output of driving pulse is terminated after those signals are
enabled; The deceleration occurs during acceleration/deceleration, and it
will be stopped immediately during constant drive. All the signals
become invalid after reset. For example, when setting the D7 and D6 of
XWR1 register to 1 and 0 (IN3 is low active), the drive will be terminated
in the case of the limit switch is on and xIN3 is low. Furthermore, these
input signals can be used as general purposed input because user can get
the level by reading the input register status (RR4, RR5)
Figure 3.9: Circuit Diagram of Deceleration/Instantaneous Stop Input
Signal
The response time of this circuit should take about 0.25 msec because of
the delay of photo coupled and RC filter.