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自动化控制系统中应用到的PLC是按逻辑运算和顺序控制的、采用扫描方式运行的以处理开关量I/O为主,模拟量I/O为辅的程序可编的控制器。工业PC控制是指采用PC机的硬件、软件,实现PLC的控制功能,具有在通信、存储、编程等方面的灵活性。PAC吸收了PLC和PC的长处,并同时具备两者的特性和强项,用于解决工业控制中传统PLC、PC不能对付的高端问题,是自动化控制的发展方向。
The PLCs used in the automation and control system are programmable controllers that are controlled by logic operations and sequenced and run in scan mode to process the switch I / Os and auxiliary analog I / Os. Industrial PC control is the use of PC hardware, software, PLC control functions, with the communication, storage, programming and other aspects of flexibility. PAC has absorbed the strengths of PLC and PC, and at the same time has both the characteristics and strengths, used to solve the traditional industrial PLC PLC, PC can not deal with the high-end issues, is the direction of development of automation and control.