2 PLC方案的设计要点
(1) 设置滤波
在PLC中一般都在输入输出接口处设置π形滤波器,它不仅可滤除来自外界的高频干扰,而且还可减少内部模块之间信号的相互干扰。
(2) 设有隔离
在PLC系统中CPU和各I/O回路(主要指数字口)几乎都设有光耦合器作隔离,以防止干扰或可能损坏CPU等。
(3) 设置屏蔽
屏蔽有两类:一类是对变压器采取磁场和电场的双重屏蔽,这时要用既导磁又导电的材料作为屏蔽层;另一类是对CPU和编程器等模块仅作电磁场的屏蔽,此时可用导电的金属材料作屏蔽层。
(4) 采用模块式结构
PLC通常采用积木式结构,这便于用户检修和更换模板,同时在各模板上都设有故障检测电路,并用相应的指示器标志它的状态,使用户能迅速确定故障的位置。
(5) 设有联锁功能
PLC中个各输出通道之间设有联锁功能。以防止各被控对象之间误动作可能造成的事故。
(6) 设置环境检测和诊断电路
这部分电路负责对PLC的运行环境(例如电网电压、工作温度、环境的湿度等)进行检测,同时也完成对PLC中各模块工作状态的监测。这部分电路往往是与软件相配合工作的,以实现故障自动诊断和预报。
(7)设置Watchdog电路
PLC中的这种电路是专门监视PLC运行进程是否按预定的顺序进行,如果PLC中发生故障或用户程序区受损,则因CPU不能按预定顺序(预定时间间隔)工作而报警。
(8) PLC的输入、输出控制简单
PLC是以扫描方式进行工作的,即PLC对信号的输入、数据的处理和控制信号的输出,分别在一个扫描周期内的不同时间间隔里,以批处理方式进行,这不仅使用户编程简单、不易出错,而且也使PLC的工作不易受到外界干扰的影响;同时PLC所处理的数据比较稳定,从而减少了处理中的错误;另外,PLC的输入、输出的控制较简单,不容易产生由于时序不合适而造成的问题。
由于PLC在设计制造时充分考虑到工业控制的现场环境问题,并采取了多层次、多种**措施来提高工作可靠性,因此,采用PLC实现电机控制,特别是对工作环境条件较恶劣的工矿企业应该是一项明智之举。
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