罗克韦尔1747-UIC

罗克韦尔1747-UIC

PLC控制系统与继电器控制系统相比,具有哪些优点?

1）控制方法上:PLC采用程序方式实现控制,容易改变或增加控制要求,且PLC的触点;

2）工作方式上:PLC采用串行工作方式,提高系统的抗干扰能力;

3）控制速度上:PLC的触点实际上是触发器,指令执行的时间在微秒级;

4）定时和计数上:PLC采用半导体集成电路作定时器,时钟脉冲由晶振提供,延时精度高,范围宽。PLC具有继电器系统不具备的计数功能;

5）可靠性和可维护性上:PLC采用微电子技术,可靠性高,所具有的自检功能能及时查出。

8、PLC为什么会产生输出响应滞后现象?如何提高I/O响应速度?

因为PLC采用集中采样、集

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中输出的循环扫描工作方式,输入端的状态只在每个扫描周期的输入采样阶段才能被读入,而程序的执行结果只在输出刷新阶段才被送出;其次PLC的输入、输出延延迟,用户程序的长度等均能引起输出响应滞后。

要提高I/O采样、输出刷新,或直接输入采样、输出刷新,以及中断输入输出和智能化I/O接口等多种方式。

9、西门子系列PLC内部软继电器有哪几种?

输入继电器、输出继电器、辅助继电器、状态寄存器、定时器、计数器、数据寄存器。

10、如何选择PLC?

1）机型选择:应从结构形式、安装方式、功能要求、响应速度、可靠性要求、机型统一等几个方面考虑;

2）容量选择:应从I/O点数、用户存储容量两个方面考虑;

3）I/O模块选择:包括开关量和模拟量I/O模块选择,以及特殊功能模块的选择;

4）电源模块及编程器等其它设备的选择。

1747-UIC 

1747-UIC