4000103-513 TRICONEX 单片机系统
PLC的可靠是多年应用和严格实验的,无数不同不同厂商的应用使其的BUG减至少,而单片机系统无法这一点。所以单片机系统的稳定和可靠要低很多,特别是系统刚开发的这一两年内,庞大的维护和升级费用将使你的成本急距上升。
当然如果你的控制对象量很多,而且对于可靠要求不高,那么单片机一定是你好的选择,比方说刚才说的空调、电视之类,这些产品的年产量都超过千万台,用单片机开发完全可以做到低的成本,并且家用电器对于可靠要求也不高,按两下按键不动,大不了再重新按一下,而在工控场合这是绝不允许的,比方说锅炉该动不动就有可能造成很大的事故。
IPC(工控机)和PLC的选择
比方说球磨机的自动控制系统,用加速度传感器采集球磨机的轴振,再通过傅利叶变换取出球磨机内存煤量的特征频率,用来控制球磨机的供煤速度。在球磨机的控制环境中需要用到像傅利叶变换之类的复杂算法,如果用PLC实现会比较困难,所以好采用IPC,并用C、C++开发对应的控制算法,如果需要为可靠的控制,我们可以将IPC的结果再交给PLC来控制。
The reliability of PLC is many years of application and rigorous experiments, countless different manufacturers of the application of its BUG reduction at least, and the single-chip microcomputer system can not do this. Therefore, the stability and reliability of the single-chip system is much lower, especially the system has just been developed in the past two years, the huge maintenance and upgrade costs will make your costs rise sharply.
Of course, if you control a lot of objects, and for the reliability requirements are not high, then the MCU must be your good choice, for example, just said air conditioning, television and so on, the annual output of these products are more than 10 million units, the development of single-chip microcomputer can be achieved at a low cost, and household appliances for reliable requirements are not high, press two keys do not move, big deal again press, In the industrial control occasions, this is never allowed, for example, the boiler should be at every turn may cause a great accident.
IPC (Industrial Control Computer) and PLC selection
For example, the automatic control system of the ball mill, the acceleration sensor is used to collect the shaft vibration of the ball mill, and then the characteristic frequency of the coal quantity in the memory of the ball mill is taken out through the Fourier transform, which is used to control the coal supply speed of the ball mill. In the control environment of the ball mill need to use complex algorithms such as Fourier transform, if the PLC implementation will be more difficult, so it is better to use IPC, and C, C++ to develop the corresponding control algorithm, if the need for reliable control, we can IPC results to the PLC to control.