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经过验证的一流性能、可靠性和安全性
■安装量超过1000万台
■参考精度为跨度的0.04%
■安装总性能为跨度的0.14%
■10年稳定度为URL的0.2%
■SIL 2/3认证(IEC 61508)
通过Coplanar™平台,最大限度地提高安装和应用的灵活性
■通过集成DP流量计、DP液位解决方案和集成歧管提高可靠性和性能。
■易于安装,所有解决方案完全组装,泄漏测试和校准。
■以广泛的产品满足您的应用需求。
高级功能
蓝牙®
技术
■提高生产效率、可靠性和人员安全。不需要热工许可证。没有攀爬罐或建筑脚手架。
■在技术人员附近访问所有设备,快速配置、维护和排除故障,速度比传统HART®连接快10倍。
诊断
■回路完整性诊断持续监测电气回路,以检测影响通信信号的问题,并将提醒您腐蚀,外壳进水或电源不稳定。
堵塞的脉冲线诊断系统持续监测堵塞的脉冲线,并提醒作业人员注意异常情况,以便作业人员在异常情况影响作业质量之前采取主动措施。
■在内置的诊断日志中跟踪诊断事件,允许您随时查看设备状态。
■这些功能经过安全认证,适用于最关键的应用。
增强软件
■特定的应用配置允许您将压力变送器转换为带累加器的流量计或带体积计算的液位变送器。
可以为任何动态变量配置进程警报。它们可以自定义名称,分配目标阈值,并可以通过HART警报或模拟输出警报进行通知。
快速服务按钮
■直观的菜单和内置的配置按钮,让您快速调试设备。
■在危险区域配置,无需使用外部按钮拆除发射机盖。
The Programmable Logic Controller (PLC) first appeared in the United States in the late 1960s. It was called PLC (Programmable Logic Controller) at that time and was designed to replace relays. To perform logical judgment, timing, counting and other sequential control functions. The concept of PLC was put forward by General Motors Corporation. PLC basic design idea is the computer function perfect, flexible, general advantages and relay control system simple, easy to understand, easy to operate, cheap advantages together, controller hardware is standard, general use. According to the actual application object, the control content is programmed into the user program memory of the controller to make the connection between the controller and the controlled object convenient.
2.3 PLC features and functions
(1) the main characteristics of PLC. PLC is characterized by reliable work, fast running speed, building block structure, flexible combination, good compatibility, simple programming and generation, rich, strong network function.
(2) the main functions of PLC. PLC system can complete the industrial real-time sequence control, condition control, counting control, step control and other functions; Capable of modular/digital (A/D), digital/modular (D/A) conversion, data processing, communication networking, real-time monitoring and other functions. Years of practice shows that PLC, reliable, is specially designed for the factory, with according to the requirements of the working environment reinforcement components, real-time scanning practice and fault diagnosis function, simple troubleshooting, deep preference of users. What makes a PLC so reliable is a real-time core or operating system of executable relay logic, sequential function diagrams, function blocks, structural text, command directories, or a combination of them. In the event of failure, the built-in device can maintain mechanical damage, and can maintain an orderly, predictable sequence.
2.4 PLC development trend: very fast logic operation and logic control, sequence control ability, in the discrete control of some reliability, convenient and easy to learn the programming method, so that it has an indisputable position in the discrete industrial automation field.
伺服电机特性
直流无刷伺服电机特点
转动惯量小,启动电压低,空载电流小;抛弃接触式换向系统,大大提高电机转速,高速可达10万转/分;无刷伺服电机在实施伺服控制时,无需编码器也可以实现速度、位置、转矩的控制;电刷无磨损,除转速高外,还具有寿命长、噪音低、无电磁干扰等特点。
直流电刷伺服电机特点
1. 体积小,动作快,反应快,过载能力大,调速范围宽
2. 转速转矩低,波动小,运转平稳
3.噪音低,效率高
4. 后端编码器反馈(可选)构成直流伺服等优点
5. 电压变化范围大,频率可调
伺服电机的优点
首先,我们来看看伺服电机与其他电机(如步进电机)相比有哪些优点:
1. 精度:实现位置、速度、转矩的闭环控制;克服了步进电机失步的问题。
2、转速:高速性能好,一般额定转速可达2000 ~ 3000转;
3、适应性强:抗过载能力强,能承受三倍额定扭矩的负载,特别适用于瞬时负载波动和要求快速启动的场合;
4、稳定性:低速运行平稳,低速运行不会产生类似步进电机的步进运行现象。适合高速响应要求;
5、时效性:电机加减速动态对应时间短,一般在几十毫秒以内;
6、舒适性:散热和噪音显著降低。
简单来说就是:平时看到的那种普通的电机,在断电后它会因为自身的惯性转一会儿,然后停止。而伺服电机和步进电机是说停就走,反应非常快。但是步进电机不同步。
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