1概述
编程软件可以对可编程序控制器控制系统的硬件组态，即设置硬件的结构和参数，例如设置各框架各个插槽上模块的型号、模块的参数、各串行通信接口的参数等。在屏幕上可以直接生成和编辑梯形图、指令表、功能块图和顺序功能图程序，并可以实现不同编程语言的相互转换。可编程序控制器编程软件有调试和监控功能，可以在梯形图中显示触点的通断和线圈的通电情况，查找复杂电路的故障非常方便。历史数据可以存盘或打印，通过网络或Modem卡，还可以实现远程编程和传送。
20世纪70年代中末期，可编程控制器进入实用化发展阶段，计算机技术已全面引入可编程控制器中，使其功能发生了飞跃。更高的运算速度、超小型体积、更可靠的工业抗干扰设计、模拟量运算、PID功能及极高的性价比奠定了它在现代工业中的地位。20世纪80年代初，可编程控制器在**工业国家中已获得广泛应用。这个时期可编程控制器发展的特点是大规模、高速度、高性能、产品系列化。这个阶段的另一个特点是**上生产可编程控制器的国家日益增多，产量日益上升。这标志着可编程控制器已步入成熟阶段。
在选型的时候，因为各种PLC都有大型、中型、小型的分别，这些分别主要是由CPU模块的性能不同造成的。在实际上，的并非一定大型的功能就是合适的。除了价格方面的考量之外，主要是，如果控制点数不多，小型的CPU模块完全可以胜任，则小型的CPU反而比大型的CPU模块工作还要可靠一些。因为，小型的CPU所涉及的资源少，。而大型CPU的资源多，在程序执行中，为处理那些程序不需用到的资源时，也要分配时间去处理，这样不仅造成资源的浪费，可能在程序处理上不及小型CPU可以更单纯和稳定地工作。
真值表就是根据控制要求，列出的线圈函数和触点变量的取值，即当线圈函数为1时，必须使哪些触点变量为1，当线圈函数为0时，必须使哪些触点变量为0。例如，当起动用接触器为1时，就必须使起动按钮为1或起动接触器为1；当起动用接触器为0时，就必须使停止按钮或热继电器或运行或定时器为0。根据控制要求，可列出其真值表，如图6所示。
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