Advantech PCI-1220U, User Manual, Page: 27 / 56

21 Chapter 3
3.6 Deceleration/Instantaneous Stop Switch Input
There are three input signals (nIN0, nIN1, nORG) that can make the
motor drives deceleration or stop. EZ is used in phase Z interface of
encoder feedback and nIN0, nIN1 are used as input signals near the origi-
nal point. If run mode is active, the output of driving pulse is terminated
after those signals are enabled; The deceleration occurs during accelera-
tion/deceleration, and it will be stopped immediately during constant
drive. All the signals become invalid after reset. For example, when set-
ting the D7 and D6 of XWR1 register to 1 and 0 (ORG is low active), the
drive will be terminated in the case of the limit switch is on and xORG 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: Deceleration/Instantaneous Stop Input
The response time of this circuit should take about 0.25 msec because of
the delay of photo coupled and RC filter.
Note: When the axis/axes is/are about to stop (in the decelera-
tion stage), the axis/axes will not stop totally but keep
moving at a very low speed if you use S-curve accelera-
tion/deceleration to control speed under the “
Point to
Point ” and “ Line Profile(interpolation) ” drive mode
(positioning operation, specify a target position) on the
conditions below:
The hardware limit is activated and the
Limited Switch
Operation Mode is set to “ Slow Down then Stop ” (WR2/
D2=1).
The software limit is enabled and activated (WR3/D, 1=1).
The
Limited Switch Function of IN1 and IN2 are
enabled (WR1/D5, 3, 1=1).