1326-CPAB-100
1326-CPAB-100
1326-CPAB-100
2）从工作方式上看，在继电器控制电路中，当电源接通时，电路中所有继电器都处于受制约状态，即该吸合的继电器都同时吸合，不该吸合的继电器受某种条件限制而不能吸合，这种工作方式称为并行工作方式。而PLC的用户程序是按一定顺序循环执行，所以各软继电器都处于周期性循环扫描接通中，受同一条件制约的各个继电器的动作次序决定于程序扫描顺序，这种工作方式称为串行工作方式。
3）从控制速度上看，继电器控制系统依靠机械触点的动作以实现控制，工作频率低，机械触点还会出现抖动问题。而PLC通过程序指令控制半导体电路来实现控制的，速度快， 程序指令执行时间在微秒级，且不会出现触点抖动问题。
4）从定时和计数控制上看，电器控制系统采用时间继电器的延时动作进行时间控制，时间继电器的延时时间易受环境温度和温度变化的影响，定时精度不高。而PLC采用半导体集成电路作定时器，时钟脉冲由晶体振荡器产生，精度高，定时范围宽，用户可根据需要在程序中设定定时值，修改方便，不受环境的影响，且PLC具有计数功能，而电器控制系统一般不具备计数功能。
◆ 企业名称：厦门泰尼电气有限公司
◆ 主营业务：DCS,PLC
◆ 经营模式： 贸易
◆ 贸易地区：
◆ 联系人： 小黄《女士》
◆ 电话：
◆手机：
◆ QQ:2917675397
◆ 传真： （备注“01006”收）
◆ E-mail： 2917675397@qq.com
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