IS220PDOAH1A 3364940CSP2 GE 模拟输出电路板

IS220PDOAH1A 3364940CSP2 GE 模拟输出电路板 

IS220PDOAH1A 3364940CSP2 GE 模拟输出电路板 传统以太网采用共享式集线器，其结构和功能仅仅是一种多端口物理层中继器，连接到共享式集线器上的所有站点共享一个带宽，遵循CSMA/CD协议进行发送和接收数据。而交换式集线器可以认为是一个受控的多端口开关矩阵，各个端口之间的信息流是隔离的，在源端和交换设备的目标端之间提供了一个直接快速的点到点连接。不同端口可以形成多个数据通道，端口之间的数据输入和输出不再受CSMA/CD的约束。

随着现代交换机技术的发展，交换机端口内部之间的传输速率比整个设备层以太网端口间的传输速率之和还要大，因而减少以太网的冲突率，并为冲突数据提供缓存。当然交换机的工作方式必须是存储转发方式，这样在系统中只有点对点的连接，不会出现碰撞。多个交换把整个以太网分解成许多独立的区域，以太网的数据冲突只在各自的冲突域里存在，不同域之间没有冲突，可以大大提高网络上每个站点的带宽，从而提高了交换式以太网的网络性能和确定性。

IS220PDOAH1A 3364940CSP2 GE 模拟输出电路板 交换式以太网没有更改原有的以太网协议，可直接使用普通的以太网卡，大大降低了组网的成本，并从根本上解决了以太网通信传输延迟存在不确定性的问题。研究表明，通信负荷在10%以下时，以太网因碰撞而引起的传输延迟几乎可以忽略不计。在工业控制网络中，传输的信息多为周期性测量和控制数据，报文小，信息量少，传输的信息长度较小。

这些信息包括生产装置运行参数的测量值、控制量、开关与阀门的工作位置、报警状态、设备的资源与维护信息、系统组态、参数修改、零点与量程调校信息等。其长度一般都比较小，通常仅为几位到几十个字节，对网络传输的吞吐量要求不高。研究表明，在拥有6000个I/O的典型工业控制系统中，通信负荷为10M以太网的5%左右，即使有操作员信息传输（如设定值的改变，用户应用程序的下载等），10M以太网的负荷也完全可以保持在10%以下。

IS220PDOAH1A 3364940CSP2 GE 模拟输出电路板 

IS220PDOAH1A 3364940CSP2 GE analog output circuit board

IS220PDOAH1A 3364940CSP2 GE Analog Output Circuit board Traditional Ethernet uses a shared hub, its structure and function is only a multi-port physical layer repeater, all sites connected to the shared hub share a bandwidth, following the CSMA/CD protocol to send and receive data. A switching hub can be thought of as a controlled multi-port switching matrix, where the information flow between the ports is isolated, providing a direct and fast point-to-point connection between the source and the target end of the switching device. Different ports can form multiple data channels, and data input and output between ports are no longer restricted by CSMA/CD.

With the development of modern switch technology, the transfer rate between switch ports is greater than the sum of the transfer rates between Ethernet ports in the entire device layer, thus reducing the Ethernet collision rate and providing caching for collision data. Of course, the working mode of the switch must be a store-and-forward mode, so that there is only point-to-point connection in the system, and there will be no collision. Multiple switches decompose the entire Ethernet into many independent areas, and Ethernet data conflicts only exist in their respective conflict domains, and there is no conflict between different domains, which can greatly improve the bandwidth of each site on the network, thereby improving the network performance and certainty of switched Ethernet.

IS220PDOAH1A 3364940CSP2 GE analog output circuit board switched Ethernet does not change the original Ethernet protocol, can directly use the common Ethernet card, greatly reduce the cost of networking, and fundamentally solve the problem of Ethernet communication transmission delay uncertainty. The research shows that when the communication load is less than 10%, the transmission delay caused by Ethernet collision is almost negligible. In the industrial control network, the transmitted information is mostly periodic measurement and control data, and the message is small, the amount of information is small, and the length of the transmitted information is small.

This information includes the measured value of the operating parameters of the production unit, the control amount, the working position of switches and valves, the alarm status, the resource and maintenance information of the equipment, the system configuration, parameter modification, zero point and range adjustment information, etc. Its length is generally relatively small, usually only a few bits to dozens of bytes, the throughput requirements for network transmission is not high. Studies have shown that in a typical industrial control system with 6000 I/ OS, the communication load is about 5% of the 10M Ethernet, even with operator information transmission (such as set point changes, user application downloads, etc.), the 10M Ethernet load can be completely maintained below 10%.

IS220PDOAH1A 3364940CSP2 GE 模拟输出电路板 

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