PLC硬件如何适应智能制造的要求
尽管人们较普遍的认识是PLC硬件技术进步是渐进的,但也不能否认,PLC的硬件技术一直在为满足工业4.0和智能制造日益清晰的要求积累经验。
特别是微电子技术的飞跃进展,使得SoC芯片在主钟频率越来越高的同时而功耗却显著减小;多核SoC的发展,又促进了在PLC的逻辑和顺序控制处理的同时,可以进行高速的运动控制处理、视觉算法的处理等;而通信技术的进展使得分布式I/O运用越来越多,泛在的I/O运用也有了起步。
为迎接工业4.0的挑战,PLC硬件设计应该在以下方面有一定的改善空间:
1、极大改善能耗和减小空间。PCB板85%的空间被模拟芯片和离散元器件所占,需要采取将离散元器件的功能集中于单个芯片中,采用新型的流线模拟电路等措施。
2、增加I/O模块的密度。
3、进行良好的散热设计,降低热耗散。
4、突破信息安全的瓶颈(如何防范黑客攻击、恶意软件和病毒)。
概括起来说,PLC的硬件必须具备综合的性能,即更小的体积,更高的I/O密度,更多的功能。
举例来说,选用新型的器件收效显著:为了减小I/O模块的体积,减少元器件的数量,采用多通道的并行/串行信号转换芯片(serializer),可以对传感器24V的输出信号进行转换、调理和滤波,并以5V的CMOS兼容电平输入PLC的MCU。这样可把必要的光电隔离器件减少至3个,来自多通道的并行/串行信号转换芯片(serializer)的信号,可共享相同的光电隔离资源。
Maxim公司的模拟器件集成设计,简化了信号链,使10V的双极性输入可以多通道采样、放大、滤波和模/数变换,而且只需单路的5V电源。这种设计取消了15V的电源,减少了元器件的数量和系统成本,降低了功耗,缩小了元器件所占用的面积。
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