Adlink PCI-8158 Manuel d'utilisateur télécharger pdf (Page 52)

42 Operation Theory

4.1.2 Pulse type motion control Interface

The second motion and motor control interface type of is pulses

train. As a trend of digital world, pulse train types represents a new

concept to motion control. The counts of pulses show how many

steps of a motor rotates and the frequency of pulses show how

fast a motor runs. The time duration of frequency changes repre-

sent the acceleration rate of a motor. Because of this interface,

users can control a servo or stepper motor more easier than ana-

log type for positioning applications. It means that motion and

motor control can be separated more easily by this way.

Both of these two interfaces need to take care of gains tuning. For

analog position controllers, the control loops are built inside and

users must tune the gain from the controller. For pulses type posi-

tion controller, the control loops are built outside on the motor driv-

ers and users must tune the gains on drivers.

For the operation of more than one axes, motion control seems

more important than motor control. In industrial applications, reli-

able is a very important factor. Motor driver vendors make good

performing products and a motion controller vendors make power-

ful and variety motion software. Integrated two products make our

machine go into perfect.

4.1.3 Network type motion control Interface

Network motion controllers were recently introduced. The com-

mand between motor driver and motion controller is not analog or

pulses signal anymore; it is a network packet which contents posi-

tion information and motor information. This type of controller is

more reliable because it is digitized and packetized. Because a

motion controller must be real-time, the network must have real-

time capacity around a cycle time below 1 ms. Mitsubishi’s SSC-

NET network is one type of network that can meet such speed

requirements.

4.1.4 Software real-time motion control kernel

There are three methods used for motion control kernels: DSP-

based, ASIC based, and software real-time based.

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Adlink PCI-8158 Manuel d'utilisateur Page 52