PLC产品发展至今从{dy}代的庞然大物，到今天的小型化、易于安装，它在外形和体积等方面，发生了巨大变化。无论是从大到小，还是接口、外形的变化，都是为了让用户能快速、轻松的安装、连接和启动，为此各厂商都在寻求创新，以便让它更易于操作和扩展，进而提{gx}率，降低人力和时间成本。
如今的PLC，运算速度、扫描速度、存储容量、I/O点数，早已今非昔比。而在多CPU并行、指令的功能与数量、特殊功能单元、扩展能力等方面，也有长足的发展，如：顺序控制、运动控制、过程控制等功能的集成，信息安全与设备诊断的理念等。
作为开放趋势的重要因素之一，PLC的通讯一直为大家所热烈讨论。现场总线的发展，使得一个个独立的PLC系统能够相互连接，加之工业以太网与PLC的结合，PLC系统可方便接入信息化系统之中。为此，各种总线可谓百花齐放：ProfiBus/ProfiNet, CANOpen, DeviceNet,Ethernet/IP, POWERLINK，EtherCAT等。另外，GSM/CDMA/3G等无线网络技术，也逐步应用。
如何连接外部系统和旧的系统？特殊传感器如何连接？总线协议千变万化，如何实现完全兼容？接口是否自诊断？编程接口是否统一？面对众多来自实际应用的问题，您认为，PLC的通讯性能究竟应该怎样发展？
从上个世纪九十年代开始，集成自动化的理念逐渐深入人心。在一个集成自动化体系里，系统中设备间能够{zd0}程度上实现资源利用与共享。然而，集成自动化离不开强大的开发平台的支持，开发工具不仅要支持PLC，还要解决故障诊断、网络通信能力以及基本自动化硬件以外的附加高级语言软件开发功能。
传统的PLC生命周期，包括设备的选型、采购、设计、安装调试、维护维修、服务等环节，而模块化PLC，让这些环节趋向标准和简化。作为工程师的我们，工作于产品生命周期的各个环节，或设计、或采购、或调试、或维护，而在这些环节，您认为PLC会有怎样的变革？
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