MSK076C-0300-NN-M1-UP0-NNNN数字交流伺服电机起到的作用

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SCXI -1346（部件号：776574-46）适用于涉及多机箱 SCXI 的应用，因为它可以将它们连接到一个 DAQ 设备。此电缆适配器有两个电缆连接。一个连接用于来自数字化仪或以前的 SCXI 机箱的信号，而二个连接用于将数字化仪的信号路由到后续机箱。SH68-68 -EP（部件号：184749-01，1 m 电缆；184749-02，2 m 电缆；184749-05，5 m 电缆；或184749-10，10 m 电缆）可单独购买并与NI SCXI 1346。这个电缆适配器有一个安装支架，可以可靠地连接到 SCXI 底盘。

SCXI 1346有四个连接器。一个连接器是前面板上的 68 针公连接器，上面印有 To Next Chassis。下一个连接器是前面板上的另一个 68 针公连接器，上面印有 From DAQ Board 或 Previous Chassis。三个连接器是印刷电路板上的 50 针公分线连接器。后一个连接器也是 50 针连接器，但它是电缆适配器背面的支架安装母头。

使用NI SCXI 1346在多机箱系统中，需要以下物品：一台计算机、一把小平头螺丝刀、68 针屏蔽电缆、一个 68 针 E 系列 DAQ 设备、一个 SCXI 1001 或 SCXI 1000 机箱（版本 K 或更高版本）、一个每个机箱的或更多 SCXI 模块（SCXI-1127、SCXI-1190 和 SCXI-1191 除外）、SCXI 1349 屏蔽电缆组件和 SCXI-1346 安装指南。用户应牢记在多机箱 SCXI 系统中使用的总电缆长度不要超过 10 m。这将有助于确保可靠的操作。
SCXI 1346使用与软件包/应用程序开发环境 (ADE) 兼容的 NI-DAQmx 驱动软件运行，例如 LabVIEW、LabWindows、LabVIEW SignalExpress、Measurement Studiio、Visual C++ 或 Visual Basic。可以使用 National Instruments Measurement & Automation Explorer (MAX) 工具配置设备硬件。在整个PLC控制系统中，容易发生故障的地点在现场，现场容易在以下几个方面出故障。

1、一类故障点也是故障多的地点)在继电器、接触器

如某生产线PLC控制系统的日常维护中，电气备件消耗量大的为各类继电器或空气开关。除了产品本身质量原因之外，主要是由于现场环境比较恶劣。例如，暴露于生产环境中的接触器触点易打火或氧化，逐渐发热变形，直至不能使用。该生产线所有现场的控制箱都是选用密闭性较好的盘柜，其内部元器件较其他采用敞开式盘柜内元器件的使用寿命明显要长。所以避免此类故障应尽量选用高性能继电器，并改善元器件使用环境，就可以减少更换的频率，降低对系统运行的影响。

2、二类故障多发点在阀门或闸板这一类的设备上

因为这类设备的执行机构相对位移较大；或者传动结构复杂，机械、电气、液压等各环节稍有不到位就会产生误差或故障。在长期的运行状态下，如果缺乏运行维护，易造成阀体部件的卡，堵，漏等现象。因此在系统运行时要加强对此类设备的巡检，发现问题及时处理。我厂对此类设备建立了严格的点检制度，定期检查阀门是否变形，执行机构是否灵活可用，控制器是否有效等，很好地保证了整个控制系统的有效性。

3、三类故障点可能发生在开关、极限位置、安全保护和现场操作上的一些元件或设备上SCXI - 1346 (Part Number: 776574-46) is suitable for applications involving multi chassis SCXI because it can connect them to a DAQ device. This cable adapter has two cable connections. One connection is used for signals from the digitizer or previous SCXI chassis, while the second connection is used to route the digitizer signal to subsequent chassis. SH68-68-EP (Part Numbers: 184749-01, 1 m cable; 184749-02, 2 m cable; 184749-05, 5 m cable; or 184749-10, 10 m cable) can be purchased separately and in conjunction with NI SCXI 1346. This cable adapter has a mounting bracket that reliably connects to the SCXI chassis.



The SCXI 1346 has four connectors. The first connector is a 68 pin male connector on the front panel with To Next Chassis printed on it. The next connector is another 68-pin male connector on the front panel, stamped From DAQ Board or Previous Chassis. The third connector is a 50 pin centimeter connector on a printed circuit board. The last connector is also a 50 pin connector, but it is the rack mounting female on the back of the cable adapter.



Using NI SCXI 1346 in a multi chassis system requires the following items: a computer, a small flat head screwdriver, a 68 pin shielded cable, a 68 pin E-series DAQ device, an SCXI 1001 or SCXI 1000 chassis (version K or later), one or more SCXI modules per chassis (except for SCXI-1127, SCXI-1190, and SCXI-1191), a SCXI 1349 shielded cable assembly, and an SCXI-1346 installation guide. Users should keep in mind that the total cable length used in a multi chassis SCXI system should not exceed 10 m. This will help ensure reliable operation.



SCXI 1346 runs using NI-DAQmx driver software that is compatible with the package/application development environment (ADE), such as LabVIEW, LabWindows, LabVIEW SignalExpress, Measurement Studios, Visual C++, or Visual Basic. You can configure device hardware using the National Instruments Measurement&Automation Explorer (MAX) tool.



In the entire PLC control system, the most prone place to failure is on site, and the site is most prone to failure in the following aspects.



1. The first type of fault point is also the place with the most faults) in relays and contactors



For example, in the daily maintenance of a production line PLC control system, the largest consumption of electrical spare parts is for various types of relays or air switches. In addition to the quality of the product itself, the main reason is that the on-site environment is relatively poor. For example, contactor contacts exposed to the production environment are prone to ignition or oxidation, gradually heating and deformation, until they cannot be used. All on-site control boxes in this production line are made of panels and cabinets with good airtightness, and their internal components have a significantly longer service life than other components in open panels and cabinets. Therefore, to avoid such failures, high-performance relays should be selected as much as possible, and the use environment of components should be improved to reduce the frequency of replacement and reduce the impact on system operation.



2. The second type of fault occurs frequently on equipment such as valves or rams



Because the relative displacement of the actuator of this type of equipment is relatively large; Or the transmission structure is complex, and slightly inadequate mechanical, electrical, hydraulic, and other links can lead to errors or failures. Under long-term operating conditions, if there is a lack of operation and maintenance, it is easy to cause jamming, blocking, and leakage of valve body components. Therefore, when the system is running, it is necessary to strengthen the patrol inspection of such equipment and promptly handle any problems found. Our factory has established a strict point inspection system for such equipment, regularly checking whether the valve is deformed, whether the actuator is flexible and available, and whether the controller is effective, which effectively ensures the effectiveness of the entire control system.



3. The third type of failure point may occur on some components or equipment in switches, limit positions, safety protection, and field operations