RELANCE 0-57100 全新静态
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。
DCS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。
Poor interoperability. Although analog instruments have unified 4-20mA signal standards, most technical parameters are still determined by manufacturers, resulting in the inability to exchange instruments of different brands. Therefore, it leads to users relying on manufacturers, unable to use the most cost-effective supporting instruments, and even a situation where individual manufacturers monopolize the market.
development direction
DCS has become quite mature and practical in its development, and undoubtedly, it is still the mainstream application and selection of industrial automation systems. It will not immediately withdraw from the stage of on-site process control with the emergence of fieldbus technology. Faced with challenges, DCS will continue to develop along the following trends:
After years of continuous application, some limitations of DCS system in industry development have gradually emerged, and the problems existing in DCS are:
(1) 1 on 1 structure. 1 instrument, 1 pair of transmission lines, transmitting 1 signal in one direction. This structure results in complex wiring, long engineering cycles, high installation costs, and difficult maintenance.
(2) Poor reliability. Analog signal transmission not only has low accuracy, but is also susceptible to interference. Various measures are taken to improve anti-interference and transmission accuracy, resulting in increased costs.
(3) Out of control state. The operator in the control room is neither familiar with the working condition of the on-site simulation instrument, nor can they adjust its parameters, nor can they predict accidents, resulting in the operator being in a state of loss of control. It is not uncommon for accidents to occur due to the operator's inability to detect on-site instrument faults in a timely manner.
DCS system is a major automation control system besides PLC, which is widely used in fields such as chemical and thermal power. However, the demand for automation technology in production has further increased, and traditional DCS systems can no longer meet the needs and require technological upgrades.
The DCS system is an automatic control system that consists of multiple computers controlling multiple control loops in the production process, while also providing centralized data acquisition, management, and control. Distributed control systems use microprocessors to control each circuit separately, while small and medium-sized industrial control computers or high-performance microprocessors are used to implement higher-level control.