ABB PPCC322BE HIEE300900R0001控制模块 DCS PLC系统原装进口

ABB PPCC322BE HIEE300900R0001控制模块 DCS PLC系统原装进口

ABB PPCC322BE HIEE300900R0001控制模块 DCS PLC系统原装进口

PPC322BE HIEE300900R0001 具有HART接口的20 mA电流环路仍然是传感器的行业标准。具有设备集成能力和脚本化可配置性的现场总线接口为这些设备提供了一种廉价的改造，以便与基金会现场总线和PROFIBUS PA一起运行。

PPC322BE HIEE300900R0001 为满足过程自动化的特殊要求而开发现场总线的工作已经进行了25年。基金会现场总线H1和PROFIBUS PA使用“曼彻斯特总线供电”(MBP)物理层，符合IEC61158-2类型1。如同模拟4一样..20 mA电流回路，这允许对装置进行远程馈电，并开发用于潜在爆炸性环境的本质安全型装置。虽然数字通信协议包括一个强大的功能集，并在实践中提供了许多优势，但现场总线仅在一小部分生产系统中使用。这种不被接受的原因有很多。控制系统仅使用来自数字现场设备的过程值，而不使用它们的诊断和参数化选项。或者控制系统不支持利用智能现场设备的“现场控制”模型。因此，用户实际上看不到使用现场总线的好处，而且在调试、故障排除和更换设备时也面临复杂的挑战。

然而，在未来，工业4.0及其衍生概念(如NAMUR开放架构(NOA))将专注于数字现场设备可为诊断和资产管理提供的大量数据。事实上，目前安装的所有传感器和定位器中，至少有四分之三仍然配备了可靠的老款4..20 mA电流环路。因此，现场设备的标准型号通常有一个模拟接口，该接口通常补充有用于参数设置的HART接口。通常还包括用于参数化和诊断的制造商专用接口。

PPC322BE HIEE300900R0001 尽管如此，新的(通常是非常大规模的)生产系统也是围绕现场总线设计的，这意味着设备制造商必须确保他们也为这一细分市场提供产品。模拟电源接口和HART调制解调器也必须更换为数字现场总线接口。这需要软件和硬件的开发工作。现场总线集成项目的预算可以很快达到六位数，而完成项目所需的时间通常在6到12个月之间。虽然这种努力对于主要制造商来说是可以接受的，但是这种方法对于只销售少量现场总线设备的较小制造商来说没有吸引力。

ABB PPCC322BE HIEE300900R0001控制模块 DCS PLC系统原装进口

The PPC322BE HIEE300900R0001 20 mA current loop with HART interface remains the industry standard for sensors. A fieldbus interface with device integration capabilities and scripted configurability provides an inexpensive retrofit for these devices to run with the Foundation Fieldbus and PROFIBUS PA.

PPC322BE HIEE300900R0001 Work has been going on for 25 years to develop fieldbuses to meet the special requirements of process automation. The Foundation Fieldbus H1 and PROFIBUS PA use the "Manchester Bus Powered" (MBP) physical layer, conforming to IEC61158-2 Type 1. Just like Simulation 4... The 20 mA current loop allows for remote feeding of the device and the development of intrinsically safe devices for use in potentially explosive environments. While digital communication protocols include a robust feature set and offer many advantages in practice, fieldbuses are only used in a small percentage of production systems. There are many reasons for this unacceptability. The control system uses only the process values from the digital field devices, not their diagnostic and parameterization options. Or the control system does not support a "field control" model that utilizes intelligent field devices. As a result, users don't actually see the benefits of using fieldbuses and face complex challenges when debugging, troubleshooting, and replacing devices.

In the future, however, Industry 4.0 and its derivative concepts, such as NAMUR Open Architecture (NOA), will focus on the vast amounts of data that digital field devices can provide for diagnostics and asset management. In fact, at least three-quarters of all sensors and positioners installed today are still equipped with reliable older models. 20 mA current loop. Therefore, standard models of field devices usually have an analog interface, which is often supplemented by a HART interface for parameter setting. Manufacturer-specific interfaces for parameterization and diagnostics are also commonly included.

PPC322BE HIEE300900R0001 Nonetheless, new (often very large-scale) production systems are also designed around fieldbuses, which means device manufacturers have to make sure they offer products for this segment as well. Analog power interfaces and HART modems must also be replaced with digital fieldbus interfaces. This requires software and hardware development work. Budgets for fieldbus integration projects can quickly reach six figures, and the time required to complete the project is usually between 6 and 12 months. While this effort is acceptable for major manufacturers, this approach is unattractive for smaller manufacturers that sell only a small number of fieldbus devices.