3HAC020925-001 3HAC020925-001

3HAC020925-001

3HAC020925-001

3HAC020925-001DCS系统是继PLC之外的一大自动化控制系统，它在化工、火电等领域的应用极为广泛，但是生产方面的自动化技术需求进一步提高，传统的DCS系统已不能满足需要，需要进行技术升级。

　　DCS系统由多台计算机分别控制生产过程中多个控制回路，同时又可集中获取数据、集中管理和集中控制的自动控制系统。分布式控制系统采用微处理机分别控制各个回路，而用中小型工业控制计算机或高性能的微处理机实施上一级的控制。

　　经过这些年来的不断应用，DCS系统在行业发展的一些局限性逐步体现出来，DCS存在的问题：

　　(1)1对1结构。1台仪表，1对传输线，单向传输1个信号。这种结构造成接线庞杂、工程周期长、安装费用高、维护困难。

　　(2)可靠性差。模拟信号传输不仅精确度低，且易受干扰。为此采用各种措施提高抗干扰性和传输精确度，其结果是增加了成本。

　　(3)失控状态。操作员在控制室既不了解现场模拟仪表的工作状况，也不能对其进行参数调整，更不能预测事故，导致操作员对其处于失控状态。因操作员不能及时发现现场仪表故障，而发生事故已屡见不鲜。

　　(4)互操作性差。尽管模拟仪表已统一4～20mA信号标准，可大部分技术参数仍由制造商自定，致使不同品牌仪表无法互换。因此导致用户依赖制造厂，无法使用性能价格比最优的配套仪表，甚至出现个别制造商垄断市场的局面。

　　发展方向

　　DCS发展至今已相当成熟和实用，毫无疑问，它仍是当前工业自动化系统应用及选型的主流，不会随着现场总线技术的出现而立即退出现场过程控制的舞台。面对挑战，DCS将沿着以下趋势继续向前发展：

　　(1)向综合方向发展：标准化数据通信链路和通信网络的发展，将各种单(多)回路调节器、PLC、工业PC、NC等工控设备构成大系统，以满足工厂自动化要求，并适应开放式的大趋势。

　　(2)向智能化方向发展：数据库系统、推理机能等的发展，尤其是知识库系统(KBS)和专家系统(ES)的应用，如自学习控制、远距离诊断、自寻优等，人工智能会在DCS各级实现。与FF现场总线类似，以微处理器为基础的智能设备如智能I/O、PID控制器、传感器、变送器、执行器、人机接口、PLC相继出现。

　　(3)DCS工业PC化：由IPC组成DCS已成为一大趋势，PC作为DCS的操作站或节点机已很普遍，PC-PLC、PC-STD、PC-NC等就是PC-DCS先驱，IPC成为DCS的硬件平台。

　　(4)DCS专业化：DCS为更适合各相应领域的应用，就要进一步了解相应专业的工艺和应用要求，以逐步形成如核电DCS，变电站DCS、玻璃DCS、水泥DCS等。北尔人机界面大特卖。。。。

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