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扩展模块的选用:对于小的系统,如80点以内的系统.一般不需要扩展;当系统较大时,就要扩展。不同公司的产品,对系统总点数及扩展模块的数量都有限制,当扩展仍不能满足要求时,可采用网络结构;同时,有些厂家产品的个别指令不支持扩展模块,因此,在进行软件编制时要注意。当采用温度等模拟模块时,各厂家也有一些规定,请看相关的技术手册。
传感器的灵敏度是有方向性的。当被测量是单向量,而且对其方向性要求较高,则应选择其它方向灵敏度小的传感器;如果被测量是多维向量,则要求传感器的交叉灵敏度越小越好。传感器的频率响应特性决定了被测量的频率范围,必须在允许频率范围内保持不失真的测量条件,实际上传感器的响应总有-定延迟,希望延迟时间越短越好。
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各公司的扩展模块种类很多,如单输入模块、单输出模块、输入输出模块、温度模块、高速输入模块等。 PLC的这种模块化设计为用户的产品开发提供了方便。
PLC的网络设计:当用PLC进行网络设计时,其难度比PLC单机控制大得多。首先你应选用自己较熟悉的机型,对其基本指令和功能指令有较深入的了解,并且指令的执行速度和用户程序存储容量也应仔细了解。否则,不能适应你的实时要求,造成系统崩溃。另外,对通信接口、通信协议、数据传送速度等也要考虑。
软件编制:在编制软件前,应首先熟悉所选用的
PLC产品的软件手册及编程指令手册,待熟练后再编程。若用图形编程器与软件包编程,则可直接编程,若用手持编程器编程,应先画出梯形图,然后编程,这样可少出错,速度也快。若用个人计算机与软件编程,编程结束后先仿真程序,待各个动作正常后,再在设备上调试。
联系人:李涛(销售一部经理)
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