可编程控制器（PLC)是为运用计算机控制生产加工所研宄出来的控制设备，是在20世纪60年代开始发展起来的，西门子在1995年成功地研发出S7200与S7300,它拥有以TD200、C0R0S0PS操作的模板，提供了方便的人机界面，程序三级口令保护，强大的运算能力，丰富的指令集，通过工业现场总线PR0FD3US和MPI接口加上与以太网联网的能力，强大的内部集成能力和强大的故障诊断的能力；模块式结构在适用在各处性能扩展、直流电机以及脉冲输出晶闸管步进电机；高效的指令处理大幅度缩短了循环周期，加上通过高速计数器，高速中断处理可以分别响应事件，就可以 大幅度的降低生产成本。因为电气控制系统的可靠性越来越受到人们的关注，一部分 公司已把自诊断技术、容错技术、冗余技术广泛应用到现在的产品之中，使用了高可靠性的冗余系统以及采用热备用或并行工作和多数表决工作模式=因为PLC系统控制 具有很多优点，所以其在工业生产能得到迅速的推广。
即使国内的PLC技术应用前景 有很大的发展，并且在一定程度上取得了不小的效益，但是和外国先进国家相比，由 于受到技术水平和经济的各种限制，大部分的企业工作车间的摇臂钻床还是 在使用继电器一接触器这么一种传统的控制方式，但是这种控制方式明显存在着隐患 和缺陷的，在生产中很容易出现故障=另外，线路复杂，因此要想找到故障也十分的 困难的。不难看出，和国外大量运用PLC技术代替继电器一接触器系统相比，我国早 PLC生产控制上还存在很大差距。
我国的PLC技术在近年我国发展迅猛，我们和先进国家的PLC发展水平在不断缩 小，不断拉近。因此，在这各时候，我们应该加大力度进一步去推广PLC控制，提高 生产水平。这次对摇臂钻床电气控制系统进行改造，是希望可以借鉴国外先 进工业形同控制的技术，把它应用到工厂加工现场，进一步提高摇臂钻床的工作性能。
Comparison of research and development of PLC technology at home and abroad
Programmable logic controller (PLC) is a kind of control equipment developed by the Research Institute of computer control production and processing. It was developed in the 1960s. Siemens successfully developed S7200 and s7300 in 1995, It has the template operated by TD200 and c0r0s0ps, provides convenient man-machine interface, program three-level password protection, powerful computing ability, rich instruction set, through the industrial field bus pr0fd3us and MPI interface, plus the ability of networking with Ethernet, powerful internal integration ability and powerful fault diagnosis ability; the modular structure is suitable for performance expansion and DC Motor and pulse output thyristor stepper motor; efficient command processing greatly shorten the cycle period, coupled with high-speed counter, high-speed interrupt processing can respond to events separately, which can greatly reduce the production cost. Because the reliability of electrical control system is more and more concerned by people, some companies have widely applied self diagnosis technology, fault tolerance technology and redundancy technology to current products, using high reliability redundancy system and adopting hot standby or parallel working mode and majority voting mode = because of PLC system control It has many advantages, so it can be rapidly promoted in industrial production.
Even if the domestic PLC technology application prospect has a great development, and to a certain extent has achieved a lot of benefits, but compared with foreign advanced countries, due to the technical level and economic constraints, most of the enterprise workshop radial drilling machine is still In the use of relay contactor such a traditional control mode, but this control mode obviously has hidden dangers and defects, in production is easy to fault = in addition, the circuit is complex, so it is very difficult to find fault. It is not difficult to see that, compared with foreign countries using PLC technology to replace relay contactor system, there is still a big gap in China's early PLC production control.
PLC technology in China has developed rapidly in recent years, and the development level of PLC between us and advanced countries is shrinking and drawing closer. Therefore, at this time, we should increase efforts to further promote PLC control and improve the production level. It is hoped that the electrical control system of radial drilling machine can learn from foreign advanced industrial control technology and apply it to factory processing site to further improve the working performance of radial drilling machine.