Advantech PCI-1240 Manual de usuario descargar pdf (Pagina 31)

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.

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Advantech PCI-1240 Manual de usuario Pagina 31