RELANCE 57C330 远程I/O网络

电源故障改从哪些方面分析?

电源问题

电源问题分为电源连线问题和电源质量问题。

电源连线问题

包括：没有连线(火、地、零几项中，其中一项没接);错误连线(火线与零线反接，地线与零线反接，地线与零线多点短接)。

电源质量问题

包括：设备连线质量(各连接头松动);技术指标(电压、频率等)超过规定要求。

线质量问题

包括：电源线线阻抗增大和绝缘层不好。

地极问题

包括：地极电阻增大，地极同地网断开。

环境问题

包括：电源线特别是地线布线不合理，同产生强磁场干扰的电线和设备相隔太近。

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)向综合化方向发展：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)0-57170 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。

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.

DCS industrial PCization: The composition of DCS by IPC has become a major trend, and PC has become a common operating station or node machine for DCS. PC-PLC, PC-STD, PC-NC, etc. are pioneers of PC-DCS, and IPC has become the hardware platform for DCS.

DCS specialization: In order for DCS to be more suitable for applications in various corresponding fields, it is necessary to further understand the process and application requirements of the corresponding profession, in order to gradually form DCS such as nuclear power DCS, substation DCS, glass DCS, cement DCS, etc.

Development towards comprehensiveness: The development of standardized data communication links and communication networks, combining various single (multi) loop regulators, PLCs, industrial PCs, NC and other industrial control equipment into a large system to meet the requirements of factory automation and adapt to the trend of openness.

Developing towards intelligence: The development of database systems, inference capabilities, and more, especially the application of knowledge base systems (KBS) and expert systems (ES), such as self-learning control, remote diagnosis, and self optimization, will be achieved through artificial intelligence at all levels of DCS. Similar to FF fieldbus, intelligent devices based on microprocessors such as intelligent I/O, PID controllers, sensors, transmitters, actuators, human-machine interfaces, and PLCs have emerged one after another.