目前很多现代化的工业应用需要更多的功能要求,如网络连接、设备互用、企业数据集成等,这些都远远超过了传统的、基于离散逻辑控制的PLC所能提供的功能,想要基于PLC的系统实现这些功能,必须用单独的处理器、网关获转换器,运行于独立的PC软件中间件以及企业系统级的专用软件进行系统集成。
PC-based在自动化应用初期被PLC阵营高度质疑,至今市场上仍有相关疑虑,主要问题有稳定、可靠和程式设计环境不稳定三点,因此也有工程师将PLC配合PC使用,不过这在系统整合上比较麻烦。
为了解决PLC和PC-based的整合问题,美国研究机构ARC提出了PAC架构的控制器(可编程自动化控制器),PAC融合了PLC和PC-based两种技术,在PC层面,会大量应用嵌入式技术,拥有使用软体来定义硬体的能力就是其一。
拥护者认为,PAC的价值在于所有部件均按照软件和硬件集成最灵活、最方便、成本最低为出发点,从而使得用户设备的生命周期成本较低,资产的投资回报率提高,资产所有者总成本下降。
当然,也有观点认为,PAC仍属于PC-based产品,只是换了另外一种包装。但就市场整体面来看,PAC的确已经逐渐成形,包括西门子在内的大厂,均已纷纷推出产品,国内像研华也推出了全新一代的PAC控制器APAX-5000系列。
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