CA6140 PLC简介 The CA6140 PLC brief

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1．一般液压滑台和机械滑台的行程控制是利用位置或压力传感器（行程开关/死挡铁）来实现；而数控滑台的行程则采用数字控制来实现。由数控滑台的结构可知，滑台的行程正比于步进电机的总转角，因此只要控制步进电机的总转角即可。由步进电机的工作原理和特性可知步进电机的总转角正比于所输入的控制脉冲个数；因此可以根据伺服机构的位移量确定PLC输出的脉冲个数：
n= DL/d （1）式中 DL——伺服机构的位移量（mm） d ——伺服机构的脉冲当量（mm/脉冲）
2．进给速度控制伺服机构的进给速度取决于步进电机的转速，而步进电机的转速取决于输入的脉冲频率;因此可以根据该工序要求的进给速度,确定其PLC输出的脉冲频率: f=Vf/60d (Hz) (2)式中 Vf——伺服机构的进给速度(mm/min)
3 进给方向控制
进给方向控制即步进电机的转向控制。步进电机的转向可以通过改变步进电机各绕组的通电顺序来改变其转向;如三相步进电机通电顺序为A-AB-B-BC-C-CA-A…时步进电机正转;当绕组按A-AC-C-CB-B-BA-A…顺序通电时步进电机反转。因此可以通过PLC输出的方向控制信号改变硬件环行分配器的输出顺序来实现，或经编程改变输出脉冲的顺序来改变步进电机绕组的通电顺序实现。

The CA6140 PLC brief introduction
1.the general liquid press the route of travel control that slippery set and machine slip a pedestal is make use of position or pressure to spread a feeling machine(the route of travel switch/dead block an iron) to carry out;But the number control slippery the route of travel of pedestal then adopt a numeral control to carry out.Being controled the structure of slippery pedestal by the number can know and slip the route of travel direct proportion of pedestal in tread Cape into the always turn of the electrical engineering, so as long as the control tread Cape into the always turn of the electrical engineering then.From tread can know that the step enters the always turn of the electrical engineering Cape direct proportion into work principle and characteristic of electrical engineering in input of control pulse piece;Therefore can move the quantity assurance pulse piece of the PLC output's according to the of servo organization: