N895600512D-N895600051C-ECPU 可编程控制器 扩展模拟量控制

N895600512D N895600051C ECPU_1 N895600200Q ALSTOM

在工厂自动化或计算机集成过程控制系统中，为了分散危险和分散功能，采用分散综合的控制系统结构。可编程控制器是分散的自治控制系统，它可以作为下位机完成分散的控制功能，与直接数字计算机的集中控制比较有质的飞跃。这种递阶控制系统也是分散控制系统的基础。

可编程控制器按扫描方式工作，N895600512D N895600051C ECPU_1 N895600200Q ALSTOM分散控制系统按用户程序的指令工作。因此，可编程控制器对每个采样点的采样速度是相同的，而分散控制系统中，可根据被对象的特采用不同的采样速度，例如，流量点的采样速度是1S，温度点的采样速度是20S等。此外，在分散控制系统中，可以设置多级中断优先级，而可编程控制器通常不设置中断方式。

存储器容量上，可编程控制器所需运算大多是逻辑运算，因此，所需存储器容量较小，而分散控制系统需进行大量数字运算，存储器容量大。运算速度方面，N895600512D N895600051C ECPU_1 N895600200Q ALSTOM模拟量运算速度可以较慢，而开关量运算需要较快的速度。抗干扰和运算精度方面，两者也有所不同，例如，开关量的抗干扰较模拟量的的抗干扰要强，模拟量的运算精度要求较高等。

分散控制系统的分散过程控制装置安装在现场，除需按现场的工作环境设计外，分散控制系统的装置通常根据安装在控制室的要求设计。可编程控制器是按照工作环境的要求设计，因此在元器件的可靠方面需有专门的考虑，对环境的适应也需专门考虑，以适应恶劣工作环境的需要。

随着应用范围的扩展，N895600512D N895600051C ECPU_1 N895600200Q ALSTOM可编程控制器和分散控制系统、现场总线控制系统、数据采集和系统相互渗透，互相补充。例如，可编程控制器扩展模拟量控制的功能，分散控制系统扩展开关量控制的功能等，出现“你中有我，我中有你”的综合集成趋势。

N895600512D N895600051C ECPU_1 N895600200Q

该模块旨在安装在正常的工业环境中，没有过度的振动，如适用于MTL4500和MTL5500产品系列。适用的标准和等级见附录A。如果暴露在温度和振动范围内，将确保持续可靠的运行规格书中给出。

N895600512D N895600051C ECPU_1 N895600200Q

任何维护或其他测试活动应仅在现场回路不工作时进行，以避免在磁场信号中引入瞬态变化的任何可能性。MTL4500和MTL5500模块的工作温度范围为-20°C至+60°C，高达95%非冷凝相对湿度。

N895600512D-N895600051C-ECPU 可编程控制器 扩展模拟量控制

N895600512D N895600051C ECPU_1 N895600200Q ALSTOM

In factory automation or computer integrated process control system, in order to disperse risk and disperse function, a decentralized integrated control system structure is adopted. Programmable controller is a decentralized autonomous control system, which can be used as a subordinate computer to complete decentralized control functions, and has a qualitative leap compared with the centralized control of direct digital computer. This hierarchical control system is also the basis of decentralized control systems.

The programmable controller works according to the scanning mode, and the N895600512D N895600051C ECPU_1 N895600200Q ALSTOM decentralized control system works according to the instructions of the user program. Therefore, the programmable controller has the same sampling speed for each sampling point, while in the decentralized control system, different sampling speeds can be adopted according to the characteristics of the object, for example, the sampling speed of the flow point is 1S, and the sampling speed of the temperature point is 20S. In addition, in decentralized control systems, multiple interrupt priorities can be set, while programmable controllers usually do not set the interrupt mode.

In terms of memory capacity, the operations required by the programmable controller are mostly logical operations, so the required memory capacity is small, while the distributed control system needs a large number of digital operations and a large memory capacity. In terms of operation speed, the N895600512D N895600051C ECPU_1 N895600200Q ALSTOM analog operation speed can be slower, and the switch operation speed needs to be faster. In terms of anti-interference and operational accuracy, the two are also different, for example, the anti-interference of the switching quantity is stronger than that of the analog quantity, and the operational accuracy of the analog quantity is higher.

The decentralized process control device of the decentralized control system is installed on the site, and in addition to the design of the on-site working environment, the device of the decentralized control system is usually designed according to the requirements of the installation in the control room. The programmable controller is designed according to the requirements of the working environment, so there needs to be special consideration in terms of the reliability of the components, and the adaptation to the environment needs to be special consideration to meet the needs of the harsh working environment.

With the expansion of the application range, the N895600512D N895600051C ECPU_1 N895600200Q ALSTOM programmable controllers and decentralized control systems, fieldbus control systems, data acquisition and systems penetrate and complement each other. For example, the programmable controller expands the function of analog control, the decentralized control system expands the function of switching control, etc., and the comprehensive integration trend of "you have me, and I have you" appears.

N895600512D N895600051C ECPU_1 N895600200Q

The module is designed to be installed in a normal industrial environment without excessive vibration, such as for the MTL4500 and MTL5500 product families. Applicable standards and grades are shown in Appendix A. If exposed to temperature and vibration ranges, it will ensure continuous and reliable operation given in the specifications.

N895600512D N895600051C ECPU_1 N895600200Q

Any maintenance or other testing activities should only be carried out when the field loop is not working to avoid any possibility of introducing transient changes in the magnetic field signal. The MTL4500 and MTL5500 modules operate in a temperature range of -20°C to +60°C with up to 95% non-condensing relative humidity.