PLC application in servo motor -

How PLC control servo motor?

before answering this question, must first clear the purpose of the servo motor, compared with the ordinary motor, servo motor is mainly used for accurate positioning, so we usually call control servo, is actually the position control of the servo motor. Actually, servo motor and with the other two kinds of working mode, the speed control and torque control, but the application is less.

speed control are generally have a frequency converter to realize, do with servo motor speed control, is generally used in rapid deceleration speed or precise control of the situation, because relative to the frequency converter, servo motor can turn within a few millimeters to a few thousand, due to the servo is a closed loop, the speed is very stable. Torque control is mainly to control the servo motor output torque, also because the response of the servo motor. Application of the above two kinds of control, can put the servo drive as a frequency converter, are generally use analog control.

the main application of servo motor or positioning control, position control, there are two physical quantities need to control, the speed and position, specifically, is to control the servo motor in what place, at the speed of how fast and accurate to stop.

the number of pulse frequency and servo driver by receiving to control the distance and speed of the servo motor running. For example, we agreed per 10000 pulses a servo motor. If PLC send 10000 pulses in one minute, then servo motor at a rate of 1 r/min through a circle, if send 10000 pulses in a second, then servo motor through at a speed of 60 r/min.

so, PLC is sent through the control pulse to control the servo motor, send pulse in physical way, also is to use PLC output transistor is the most commonly used way, generally is the low end of the PLC in this way. And in high-end PLC is through the way of communication to the number and frequency of the pulse is transmitted to the servo drive, such as the Profibus - DP CANopen, MECHATROLINK - II, EtherCAT and so on. These two approaches is different channels, essence is the same, for our programming, is the same. This is I want to say with you, to learn principle, instance, rather than to learn and learn.

for programming, the difference is very big, is Japanese PLC with the method of instruction, and European series PLC controller is in the form of function block. But the essence is the same, such as an absolute positioning servo control go, we need to control the output of the PLC channel, pulse number and pulse frequency, deceleration time, and need to know when positioning servo driver is accomplished, if encounter limit and so on. , no matter what kind of PLC is to control these quantities and movement parameters can be read, just different is not the same as the realization method of PLC.

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