罗克韦尔80026-511-12-R 电源模块库存实货

MatrikonOPC 艾伦-布拉德利OPC服务器 (MatrikonOPC Server for Allen Bradley PLC) 通过OPC访问艾伦-布拉德利 (Allen Bradley) PLC。该OPC服务器 (OPC Server) 是针对那些正需要将艾伦-布拉德利PLC与historians、 HMI以及其它支持OPC接口的应用程序或设备整合起来的集成商、用户们而开发的，它不需要任何第三方应用程序即可完成连接。 与其它Allen Bradley驱动不同的是，该OPC服务器不但拥有友好的用户界面而且经济实惠。

　　MatrikonOPC艾伦-布拉德利OPC服务器具有其它同类别服务器所不具备的省时高效的特征，例如：

　　自动探测、发现设备

　　ControlLogix路由

　　可加载设备配置文件（configuration file）l5k、 .pc5 及 .slc

　　自动配置串行端口设置

　　为每一个设备自动生成数据项

　　通过故障切换通道支持设备级冗余

　　支持ControlLogix PLCs上的用户自定义结构

　　该OPC服务器所支持连接的设备:

　　PLC5's

　　SLC500's

　　Micrologix's

　　ControlLogix's

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　　The more basic concept in functional safety is that of a safety function. A safety function defines an operation that must be carried out to achieve or maintain safety. A typical safety function contains an input subsystem, a logic subsystem, and an output subsystem. Typically, this means that a potentially unsafe state is sensed, and something makes a decision on the sensed values and, if deemed potentially hazardous, instructs an output subsystem to take the system to a defined safe state.

　　The time between the unsafe state existing to achieving a safe state is critical. A safety function might, for instance, consist of a sensor to detect that a guard on a machine is open, a PLC to process the data, and a variable speed drive with a safe torque off input that kills a motor before a hand inserted in a machine can reach the moving parts.

　　B. Safety Integrity Levels

　　SIL stands for safety integrity level and is a means to express the required risk reduction needed to reduce the risk to an acceptable level. According to IEC 61508, the safety levels are 1, 2, 3, and 4, with an order of magnitude increase in safety requirements as you go from one level to the next. SIL 4 is not seen in machinery and factory automation where generally no more than one person is typically exposed to a hazard. It is rather reserved for applications like nuclear and rail where hundreds or even thousands of people can be hurt. There are also other functional safety standards such as automotive, which uses ASIL (automotive safety integrity levels) A, B, C, and D, and ISO 13849. Its performance levels A, B, C, D, and E can be mapped to the SIL 1 to SIL 3 scale.