运行速度快
随着微处理器的应用，使PLC的运行速度增快，使它更符合处理高速度复杂的控制任务，它与微型计算机之间的差别不是很明显。
8、总价格低
PLC的重量、体积、功耗和硬件价格一直在降低，虽然软件价格占的比重有所增加，但是各厂商为了竞争也相应地降低了价格。另外，采用PLC还可以大大缩短设计、编程和投产周期，使总价格进一步降低。
PLC系统与工业总线计算机和DCS系统相互渗透，互为借鉴，相互竞争而发展。促进了工业的进步。
PLC产品面临现场总线的发展，将再次革新，满足工业与民用控制的更高需要。
三、PLC的通信及联网
PLC的通信包括PLC之间、PLC与上位计算机之间以及PLC与其他智能设备间的通信。PLC系统与通用计算机可以直接或通过通信处理单元、通信转接器相连构成网络，以实现信息的交换，并可构成“集中管理、分散控制”的分布式控制系统，满足工厂自动化(FA)系统发展的需要，各PLC系统或远程I/O模块按功能各自放置在生产现场分散控制，然后采用网络连接构成集中管理的分布式网络系统。
以西门子公司的SIMATIC NET为例，在其提出的全集成自动化(TIA)的系统概念中，核心内容即包括组态和编程的集成、数据管理的集成以及通信的集成。通信网络是这个系统重要的、关键的组件，提供了部件和网络间完善的工业通信。
SIMATIC NET包含了三个主要层次：
AS-I网——传感器和执行器通信的国际标准，扫描时间5ms，传输媒体为未屏蔽的双绞线，线路长度为300m，多为31个从站。
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